Jieyu Zhang

Shanghai University | SHU · Department of Materials Engineering

In order to further reduce the production cost and enhance product of steel strip marketing competitiveness, industrial enterprises will choose to increase production rate, leading to the more dross generation. This paper proposes a numerical simulation based on thermodynamics, computational fluid dynamics (CFD) and discrete particle method (DPM) t...

The present paper studied the microstructure, micro-hardness and corrosion behavior of the hot-dip Zn-xAl-1.8Mg(-ySn) (x=0.2, 1.2, 1.5, 2.0, 2.5, 3.5, and y= 0.3, 0.8 wt.%) alloy coatings on 22MnB5 steels via analysis of the phase composition, micro-hardness test and electrochemical measurements. The results show a decrease in Mg-Zn phase fraction...

To clarify the controversy regarding the phase equilibria in the Mg-rich corner of the Mg-Zn-Sm system, alloys annealed at 320 °C and 400 °C were employed to determine the phase constitution, composition and crystal structure by scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The maximum solub...

In order to reduce the susceptibility of liquid metal embrittlement (LME) on advanced high strength steels, this paper proposes a strategy to increase the thickness of the inhibition layer and retard the interdiffusion of Fe and Zn by adjusting the Al content in the coating, so as to improve this key problem in industrial application. On the basis...

Surface tension is closely related to the wettability of solders, which is a crucial property for the design of Pb-free solders. However, the experimental surface tension data are scarce, especially for the multicomponent systems. In this paper, the surface tension of Sn-Ag-Cu (SAC) based ternary, quaternary and quinary alloys are predicted by vari...

Model prediction is an effective method to obtain the physicochemical properties data of molten slags, which is difficult to test experimentally due to their high melting points. Empirical models are prevalent at present; however, it needs large amount of experimental data to fit the empirical parameters with narrow application scope. In this paper...

Geometrical model has been widely used in the property prediction of melts, where three “representative points” on binary systems are selected for the calculation of ternary systems. In this paper, an optimized method with “representative regions” of binary systems is first proposed for the calculation based on geometrical model. The “weight probab...

In this paper, the instability mechanism of the Fe-Al inhibition layer produced by the interfacial reaction in the Al-containing zinc melts on the hydrogen-reduced steel is studied in detail. The results show that the surface morphology of hydrogen-reduced hot-rolled steel at different temperatures is mainly divided into porous and dense states. Du...

In this paper, based on the effect of different intermetallic compounds on liquid metal induced embrittlement (LMIE) and corrosion resistance of GI coating during hot-forming process, a low-aluminum, low-magnesium Zn-Al-Mg alloy with high corrosion resistance is designed by CALPHAD method. The equilibrium phase diagram and solidification path of Zn...

Although Zn-coatings have enhanced corrosion resistance of steels, Zn-induced liquid metal embrittlement (LME) is susceptible during hot forming. Prolonging the annealing time in the austenitization before hot forming eliminates the liquid phase, which is an effective way to prevent LME. This work optimizes the austenitization process window by sys...

Pt/nitrogen-doped reduced graphene oxide (N-GO) catalysts were prepared by one-step microwave-assisted ethylene glycol reduction using N-methyl-2-pyrrolidone (NMP) as the nitrogen source. Nitrogen doping in GO and the deposition of highly dispersed platinum nanoparticles were completed at the same time. The effect of adding NMP on the microstructur...

Double Line (DL) model is an efficient method for predicting the physicochemical properties of systems with limited solubility area, and linear interpolation is always taken for the boundary-property interpolation. In this paper, two nonlinear interpolation methods are introduced to optimize the interpolated results on the calculation boundary, whi...

Ce–Mg–Ni alloys have a high affinity for hydrogen, and are typical examples of compounds that form hydrides. These hydrides may be formed in medium vacuum by using a hydrogen getter. In this study, Ce23Mg4Ni7 ternary alloy was fabricated by vacuum induction melting. The hydrogen absorption kinetics of the alloy were tested using an automatic Siever...

The reduction of surface states of cadmium zinc telluride (CZT) film is essential to fulfill the functionalities for UV detection. However, the implementation of CZT-based UV detector has encountered the big issue of large leakage current arising from the surface roughness and surface defects in the growth process. In this work, the surface combina...

A great understanding of the manipulation of film thickness has led to a number of advances in controlling film-based device properties. Here, the resistance random access memory (RRAM) device of Au/magnesium-doped zinc oxide (MZO)/indium tin oxide (ITO) configuration was fabricated with the asymmetric electrode. The variation of MZO film thickness...

In this paper, we describe the synthesis of the AC-PtNi/G catalysts with graphene as the carrier, via the alcohol reduction and the sulfuric acid treatment. The prepared catalysts were microscopically characterized by X-ray diffractometry(XRD), X-ray photoelectron spectroscopy(XPS), scanning electron microscopy(SEM), electron spectroscopy(EDAX), an...

In this paper, an extended Miedema's model is constructed to illustrate its applicability to estimating the solid-solution enthalpies of Ce–Mg–Ni–H hydrides, adopting the range of an optimized stoichiometry alloy in the contour map of solid-solution state enthalpy. Ce2MgNi2 alloy is designed to investigate its hydrogen storage properties, and its m...

To replace the traditional pickling process, an environmentally friendly gaseous reduction method was used for the removal of the oxide scale of steel in this work. Isothermal hydrogen reduction of high-strength steel was investigated in the temperature range from 500 °C to 800 °C in 30%H2-N2 atmosphere. The obtained results revealed a clear relati...

Ferrite-based slags are the basic systems in the pyrometallurgical production of copper, and the density and molar volume of these systems are of vital importance for optimizing the metallurgical process. However, due to the high melting points of melts and the expensive trial costs, experimental methods are inefficient to obtain all the data neede...

The cover shows the evolution of free‐surface vortex and the slag‐layer behavior during the end of casting in tundish. A developed mathematical model has been adopted to describe the process, and a vortex prevention method has been proposed. Further details can be found in this article number 1900616 by Bo Wang and co‐workers.

Magnesium and its alloys are significant superior metallic materials for structural components in automobile and aerospace industries due to their excellent physicomechanical properties. The Mg–rare earth (RE) systems have attracted great interests because RE additions can improve both the deformability and the strength of Mg alloys through solid s...

Geometrical model is an important part of the CALPHAD method and has been widely used for the prediction of physicochemical properties of multicomponent systems. However, most of the researches are focused on the comparison of the predicted results by various geometrical models, and very few studies have analyzed the underlying causes of these diff...

In the present work, the formation of the vortex and slag entrainment in tundish is studied by using mathematical simulation and physical simulation. This paper is aiming at contributing to the understanding of the free surface vortex formation in continuous casting tundish at the end of casting. A three‐dimensional multiphase mathematical model us...

The Mg–Zn–Ce alloys exhibit good creep resistance and strength at elevated temperature due to the formation of intermetallic compounds. However, the ternary compounds and phase equilibria in the Mg-rich corner are still controversial which restrains the development of Mg–Zn–Ce alloys. The present work experimentally investigated the phase equilibri...

Liquid-zinc-induced embrittlement in the Σ5 [1 0 0] 36.8° symmetric tilt grain boundary (STGB) of bcc Fe is investigated using the first-principles computational tensile test (FPCTT). The result reveals that the strength and ductility of the grain boundary (GB) decrease after zinc doping. In addition, the effect of zinc on the chemical bond and ele...

CaO–Al2O3–CaF2 system is the most basic slag system for electroslag remelting (ESR). Its physicochemical properties, such as viscosity, electrical conductivity and sulfide capacity are all critical to the control and optimization of ESR process. However, it is difficult to obtain all these data through experiment. In this article, an extended geome...

In this paper, the oxidation behaviors of DP980 advanced high strength steel (AHSS) are studied during annealing in a hydrogen atmosphere with different temperatures and heating rates. It is revealed that with the increase in holding time, the different heating rates affecting the surface oxide precipitation on the strip surface will be weakened. M...

In this paper, CeO2 with a pore size of 2–4 nm was synthesized by hydrothermal method. The CeO2 modified graphene-supported Pt catalyst was prepared by the microwave-assisted ethylene glycol reduction chloroplatinic acid method, and the effect of the addition of CeO2 prepared by different hydrothermal reaction time on the catalytic performance of P...

Hot press forming of Zn coated 22MnB5 is an effective way of producing ultrahigh strength structural parts for automobiles. The austenization process in hot press forming was investigated in our work. The results showed that the interfacial Fe2Al5 inhibition layer in coated steel plays a critical role in diffusion during the austenization process....

: A comparative study of the corrosive resistance and dross formation of 55Al–Zn–1.6Si (wt%) (55AZS) and 23Al–Zn–0.3Si–xMg (wt%) (23AZS–xMg, x = 0, 1.5, 3) alloys are performed using immersion corrosion and dross formation test, respectively. The result of immersion corrosion testing shows that corrosive rate of the 23AZS alloy is lower than that o...

As a hydrogen storage material, ReMg (Re = Rear Earth metal) alloys hold great promises for sustainable hydrogen energy development. In this work, we aim to explore the reaction route and thermodynamic conditions for Ce/Mg-based alloys with good hydriding property. Using the extended Miedema model, the formation enthalpies of CeH, MgH and NiH singl...

Wire rods produced by the Stelmor air cooling process were found to have the problem of microstructure non-uniformity. The proper distribution of cold air from the nozzle of the plenum chamber can adjust the convection heat transfer intensity at the different positions of wire loops, and further control the dynamic distribution of temperature and p...

Due to the limited heating power in non-oxidation furnace of continuous strip processing facilities of heating stage, selective oxidation with higher oxygen pressure is practically inevitable, which will greatly influence the quality of coating during immersion into the zinc bath. In this paper, the oxidation behaviors of DP980 advanced high streng...

The nucleation and growth of nitrogen bubbles for duplex stainless steels are of great significance for the formation mechanism of bubbles during solidification. In the current study, numerical method and theoretical analysis of formula derivation were used to study the formation of nitrogen bubbles during solidification. The critical sizes of the...

The performance of Support Vector Regression (SVR) depends heavily on its parameters, but some optimization methods based on Grid Search (GS) or evolutionary algorithms still have several issues that must be addressed. This paper proposes a new hybrid method (PSO-SS) that combines Particle Swarm Optimization (PSO) and Scatter Search (SS) to optimiz...

A cellular automata (CA) method assisted by a back-propagation neural network (BPNN), named CA-BPNN, is proposed to simulate grain and pore growth. First, CA-BPNN uses the BPNN to detect the relations between porosity and solidification parameters and then uses the relations to establish extra transformation rules of pore growth, which are finally...

To overcome the low lithium ion diffusion and slow electron transfer, a hollow micro sphere LiFePO₄/C cathode material with a porous interior structure was synthesized via a solvothermal method by using ethylene glycol (EG) as the solvent medium and cetyltrimethylammonium bromide (CTAB) as the surfactant. In this strategy, the EG solvent inhibits t...

The effect of various silicon levels on spangle size in hot-dipped 55 wt%Al-Zn-xSi (x = 0.5, 1.0, 1.6, 2.0, 4.0, all in wt%) coatings was studied. The results showed that as silicon content was increased from 0.5 to 4.0 wt%, spangle size increased gradually from the minimized range to the normal range. Spangle range transition occurred in silicon c...

In order to instead of traditional acid picking method, an environmentally friendly gaseous reduction method was performed to obtain the relationship between of reduction process of oxide scale and morphology of porous iron. The isothermal hydrogen reduction of oxide scale on hot-rolled steel strip in 30 pct H2N2 atmosphere at temperature from 500...

The hot deformation behavior of spray-formed 1.28C–6.4W–5Mo–4.2Cr–3.1V–8.5Co high speed steel is investigated in the 950–1100°C temperature range at a strain rates of 0.1 to 50 sec–1 and a true strain of 1.0. The activation energy for hot deformation is obtained. The relation between the flow stress and Zener–Hollomon parameter is successfully anal...

Cerium-doped lutetium oxyorthosilicate (LSO:Ce) scintillator ceramics were fabricated by slip casting in a 9 T vertical magnetic field, followed by hot isostatic pressing (HIP) at 1650 °C under 150 MPa applied pressure. XRD and Electron Backscatter Diffraction (EBSD) mapping results reveal that the grains of the LSO:Ce ceramics are aligned along th...

Lutetium oxyorthosilicate (LSO) exists in two different crystallographic phases, both with the monoclinic structure. The low temperature polymorph, referred to as A-type LSO (A-LSO), crystallizes in space group P21/c, whereas the high-temperature polymorph, referred to as B-type LSO (B-LSO), crystallizes in space group C2/c. In this study, two diff...

The effects of presintering temperature, soak time, and Hot Isostatic Pressing (HIPing) temperature on the microstructure and densification behavior of cerium-doped lutetium oxyorthsilicate (Lu2SiO5:Ce, LSO:Ce) ceramics were investigated. It was determined that the most suitable presintering conditions (minimum presintering temperature and shortest...

Nb–Si based composites are one of the most promising superalloy for the next generation turbine airfoil materials. Alloying Ti can efficiently improve their poor oxidation resistance. In this work, five equilibrium alloys were used to determine the unclear but underlying phase equilibria in the Nb–Ti rich region of the Nb–Si–Ti system at 1200 °C. C...

In this study,the gas–liquid two phase flow behavior in the vacuum vessel during the Rheinstahl-Heraeus(RH) refining process was investigated to improve the refining effect. Special attention is paid to investigate double powder injection lances system which is used to improve the refining efficiency during RH refining process. The melt flow behavi...

Based on the available thermodynamic description and experimental diffusivities, the diffusion mobilities of Ni, Cu and Mn for fcc Ni–Cu–Mn ternary alloys have been investigated in the present work. Interdiffusion coefficients for fcc Ni–Mn binary alloys with Mn content up to 60 at% and for Ni-rich fcc Ni–Cu–Mn ternary alloys were measured using di...

Contour diagrams are very useful for describing how a property changes with other variables. One such a diagram is the isothermal lines on a liquidus projection, which helps us understand how the liquidus surface changes with temperature and composition. A method has been implemented in Pandat to calculate two-dimensional property contour diagrams...

The effect of Ti and Si on the nucleation of primary α-Al from the Al–43.4 wt.%Zn − 1.6 wt.%Si alloy was studied by adding Al–Ti–B to the master alloy during cooling and solidification. The effect of Si on the stability of the TiAl3/Al interface was analyzed by performing first principles calculations. The results showed that TiAl3 and the Al matri...

In order to research the mechanism which grain refinement of 55wt%Al-Zn-1.6wt%Si alloy by Al-5wt%Ti-0.2wt%B (master alloy), the effect of different amount of master alloy on the microstructure and characteristic value of solidification for 55wt%Al-Zn-1.6wt%Si alloy were studied using thermal analysis. Important solidification events evaluated using...

Cerium-doped lutetium oxyorthosilicate ( Lu2SiO5 : 0.5 mol%Ce, LSO:Ce) scintillation ceramics was fabricated by pre-sintering at 1650° C for 4 h in air followed by a post hot isostatic pressing (HIP) at 1600° C under 150 MPa for 1 h in Ar atmosphere. Luminescent and scintillation properties of the as-HIPed LSO:Ce ceramics was seriously affected by...

Thermal simulation equipment (TSE) was recently developed to simulate the solidification process in the industrial continuous casting of slab. The grain growth, solid-liquid interface movement, and columnar-to-equiaxed transition (CET) in the continuous casting process can be reproduced using this equipment. The current study is focused on the effe...

Solidification process is very important for making fiber reinforced aluminum matrix composites. Some recent studies have used cooling through reinforcing carbon fibers to obtain better control over the solidification microstructure in the post pressure infiltration process. The present work is focused on studying the effect of active cooling fiber...

Hot-dipping Al-Si coating of 22MnB5 steel and DC51 steel were done in molten Al-Si bath with about 10%Si for different dipping time ranging from 3 to 300 seconds, at the temperature of 660°C, 680°C and 700°C. To study the influence of different matrix, temperature and dipping time on the intermetallic layer, the microstructure of the intermetallic...

The information of phase diagram for the Sm-Zr system is deficient. A diffusion couple and two alloys in Sm-rich side of Sm-Zr system were prepared. The phase equilibrium in the alloys at 800 and 900°C were determined by scanning electron microscopy, equipped with energy dispersive X-ray spectroscopy (SEM-EDS) and X-ray diffraction(XRD). The result...

The site preference of Si in TiAl3 is calculated using first principles method based on Density Functional Theory. Through the analyses and comparison of the binding energy of systems with different substitution behaviors, it is shown that Si prefers to occupy the site of Al(2) and the limited solubility of Si in TiAl3 is around 12.5%. Then this ar...

Mo-ZrO2 cermet is a potential material for application as electrode in steel purifying process with addition of electrical field because of its high electrical conductivity and good corrosion resistance to molten slag and steel at high temperature. This paper describes the static corrosion test of Mo-ZrO2 cermet sample with Mo content 30 vol.% in C...

High-strength steel possesses excellent strength, toughness, wear resistance and weld-ability, and therefore, are widely used in various fields. Because the high strength steel contains highly content of Mn and Si, they always lead to quality problem for the process of hot-dip aluminum coating. In this work, we applied improved sessile drop method,...

We have extended the dendritic growth model first proposed by Boettinger, Coriell and Trivedi (here termed EBCT) for microstructure simulations of rapidly solidified non-dilute alloys. The temperature-dependent distribution coefficient, obtained from calculations of phase equilibria, and the continuous growth model (CGM) were adopted in the present...

The luminescent properties of LSO:Ce (1 mol%) scintillators were characterized systematically under vacuum ultraviolet (VUV)-UV excitation. Under 185 nm VUV excitation, a broad emission band was detected in the wavelength range from 350 nm to 600 nm at different temperatures, which is ascribed to the 5d→4f electron transitions of Ce3+. Excitation w...

The continuous casting tundish has evolved into a useful reactor for liquid steel refining. The appreciate flow control devices such as dam, turbulence inhibitor and gas blowing, helps to modify the pattern and minimize short circuiting and dead zone. In this paper, a commercial computational fluid dynamics (CFD) package FLUENT was used to predict...

Nozzle plays a key role in determining the flow behavior in the mold of the continuous casting process with and without nozzle gas injection. Different modifications applied to the ports are used to study the flow behavior. The predicted results with k-ϵ turbulence model show that the backflow phenomenon eliminates owing to a low pressure zone at t...

Rare earth (RE) elements have been added into Mg-based hydrogen storage alloys to form Mg-based RE-Mg hydrogen storage alloys due to their active properties. These alloys have attracted extensive attention owning to their good hydrogen storage performance. However, because of the lack of the guidance by phase diagrams in the RE-Mg system, the mater...

Solidification process is very important for making fiber reinforced aluminum matrix composites. Some recent studies have used cooling through reinforcing carbon fibers to obtain better control over the solidification microstructure in the post pressure infiltration process. The present work is focused on studying the effect of active cooling fiber...

The site preference of Si in TiAl3 is calculated using first principles method based on Density Functional Theory. Through the analyses and comparison of the binding energy of systems with different substitution behaviors, it is shown that Si prefers to occupy the site of Al(2) and the limited solubility of Si in TiAl3 is around 12.5%. Then this ar...

High-strength steel possesses excellent strength, toughness, wear resistance and weld-ability and therefore, are widely used in various fields. Because the high strength steel contains highly content of Mn and Si, they always lead to quality problem for the process of hot-dip aluminum coating. In this work, we applied improved sessile drop method,...

Hot-dipping Al-Si coating of 22MnB5 steel and DC51 steel were done in molten Al-Si bath with about 10%Si for different dipping time ranging from 3 to 300 seconds, at the temperature of 660°C, 680°C and 700°C. To study the influence of different matrix, temperature and dipping time on the intermetallic layer, the microstructure of the intermetallic...

The information of phase diagram for the Sm-Zr system is deficient. A diffusion couple and two alloys in Sm-rich side of Sm-Zr system were prepared. The phase equilibrium in the alloys at 800 and 900 °C were determined by scanning electron microscopy, equipped with energy dispersive X-ray spectroscopy (SEM-EDS) and X-ray diffraction(XRD). The resul...

Mo-ZrO2 cermet is a potential material for application as electrode in steel purifying process with addition of electrical field because of its high electrical conductivity and good corrosion resistance to molten slag and steel at high temperature. This paper describes the static corrosion test of Mo-ZrO2 cermet sample with Mo content 30 vol.% in C...

The X12(12CrMoWVNbN) steel is used in ultra-supercritical steam turbine rotors, which play a crucial role in the large nuclear power plant. However, the quality of the heavy ingots has been commonly affected by their solidification structure. One of the most typical defects is the centerline shrinkage porosity. With this context, a 50×120mm X12 ste...

Grain refinements were an effective method to improve the mechanical properties of aluminium alloy, and heterogeneous nucleation was widely applied in industry to achieve a grain-refined. In this study, grain refinement behavior of 55%Al-Zn-1.6%Si alloy by Al-Ti-B was investigated. In order to obtain the microstructure in situ, high-temperature liq...

Nozzle plays a key role in determining the flow behavior in the mold of the continuous casting process with and without nozzle gas injection. Different modifications applied to the ports are used to study the flow behavior. The predicted results with k-ε turbulence model show that the backflow phenomenon eliminates owing to a low pressure zone at t...

The continuous casting tundish has evolved into a useful reactor for liquid steel refining. The appreciate flow control devices such as dam, turbulence inhibitor and gas blowing, helps to modify the pattern and minimize short circuiting and dead zone. In this paper, a commercial computational fluid dynamics (CFD) package FLUENT was used to predict...

Single-phased Lu2SiO5:Ce3+ (LSO:Ce) phosphors with primary particle size of about 250 nm were synthesized by a core–shell approach. Microstructure observation on the LSO:Ce precursor powders with core–shell structure demonstrates that considerable contact area between core (SiO2) and shell (Lu2O3) decreases the migration resistance between SiO2 and...

Based on the available thermodynamic parameters and experimental diffusivities in the literature as well as measured in the present work, the diffusion mobilities of Ni, Cr, and Mo for fcc Ni-Cr-Mo alloys have been assessed by means of the CALPHAD method. Comprehensive comparisons between the calculated and experimental data show that an excellent...

The algorithms for calculating two-dimensional (2D) phase diagrams and three-dimensional (3D) phase diagrams are described. While the concept of the zero-phase-fraction is used to calculate 2D phase diagrams, the concept of one-phase fraction is applied to calculate 3D phase diagrams. 3D phase diagrams can be better viewed with contour lines such a...

Monolithic zirconia-molybdenum (m-ZrO2/Mo) cermets of different compositions (5-40 vol.% Mo) and different initial Mo particles sizes (0.08-13 μm) were prepared by traditional powder metallurgy process. The influences of metal content and initial particle sizes on the densification behavior, microstructure, and electrical conductivity of the cermet...

This study examines the microstructure of La2Mg17/Ni composites produced by ball-milling with lithium bromide, and the effect of varying this LiBr addition on the electrochemical properties of the resulting electrode material. Through this, it was found that LiBr helps prevent crystallization of the alloy, thereby refining the particle size and ens...

Introduction Experimental Model Descriptions Simulation Process and discuss Conclusion

Introduction Experimental Results and Discussion Conclusions Acknowledgements

Introduction Experiment Equipment and Process Experiment Result Discussion Conclusion

Grain refinements were an effective method to improve the mechanical properties of aluminium alloy, and heterogeneous nucleation was widely applied in industry to achieve a grain-refined. In this study, grain refinement behavior of 55%A1-Zn-1.6%Si alloy by Al-Ti-B was investigated. In order to obtain the microstructure in situ, high-temperature liq...

Introduction Experiment The Experimental Results and Discussion Conclusions

Introduction Experimental Results and Discussion Conclusion

In terms of special resources with iron, niobium and rare earth coexisting in Baiyuneboite, the new smelting technology of ferrocolumbite was studied. Reduction experients for the Baiyuneboite and explores ore phase change of Baiyuneboite in the process of reduction was conducted with graphitic carbon as the main reducer and a temperature below 100...

The reactive diffusion layer between solid Fe-Mn and liquid 55Al-Zn-1.6Si (Galvalume, GL) was experimentally observed using Fe-Mn/GL diffusion couples. The diffusion couples were prepared by vacuum sealed technique and then immediately annealed at temperatures of T=873 K for various times up to t=2h. During annealing, a compound region consisting o...

The phase transformation of bayan obo ore with high concentration of iron and calcium was reduced at temperatures no more than 1000°C were investigated in this study. The samples with insufficient carbon were treated at the temperature using a vertical furnace with a thermogravimetry (TG). The mineral phases and content were examined using X-ray di...

As heat dissipation material, magnesium alloys have smaller specific gravity and bigger specific heat capacity than copper alloys and aluminum alloys. The object of this study focused on the Mg-2.5Nd-1.0Zn-0.5Zr (wt.%) alloy. A research on Mg-xNd-yZn-0.4Zr (x=1.25–3.25,y=0–2.0,wt.%) alloys had been carried out systematically, but there was few repo...

As for studying the segregation of elements and the phase transition in the solidification process of the AISI 301 austenite stainless steel, the Differential Thermal Analysis was used to perform the quenching experiment. Under the industry cooling rate (25K/min), the phase transition process of 301 austenite stainless steel is analyzed, and effect...

The α + β-type Ti-4.5Al-6.9Cr-2.3Mn alloy has been theoretically designed on the basis of assessment of the Ti-Al-Cr-Mn thermodynamic system and the relationship between the molybdenum equivalent and mechanical properties of titanium alloys. The alloy is successfully prepared by the split water-cooled copper crucible, and its microstructures and me...

The heavy forging ingots have been widely used in the large nuclear power plant, which play a crucial role as the low-pressure rotors. However the quality of heavy ingots was not satisfied. In this paper, the solidification process of a 25-ton 30Cr2Ni4MoV ingot was simulated using the commercial FEM casting simulation software Procast package. The...

The interface reaction and transport characteristics between the molten melt and CaO-MgO-Al2O3 slag was studied by cyclic voltammetry (CV) during the process of electrochemical deoxidization. The CV curve results showed that there was an obvious reduction and oxidization peak at the sweep rate of 20mV/s, and the oxidation current was not entirely c...

In this paper, solidification process of steel ingot was simulated by ProCAST software, based on cellular automaton-finite element (CAFE) model. A 22 t steel ingot was divided into continuous small zones (100×150×180 mm) in radial direction, then the temperature field, shrinkage cavity and porosity, particularly, the microstructure were simulated....

Nucleation and growth model based on a 3D CAFE model, which was incorporated with macro heat transfer calculation within ProCAST software was used to predict the solidification microstructure of austenitic stainless steel in twin-roll strip casting. The simulation results of solidification microstructure agreed well with experimental results of aus...

The Southeast Asia laterite ore with high concentration of silicon and magnesium was ground and divided into five grades according to the particle size. Then the samples with insufficient carbon were treated at the temperature no more than 800°C using a tube furnace. The mineral phases and content were examined using X-ray diffraction (XRD) and X-r...