Fig 4 - available via license: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Content may be subject to copyright.
SEM micrograph of MM360 series specimen after fatigue tests explaining that fatigue crack paths are not influenced by the harmonic structure (CP titanium).
Source publication
Commercially pure (CP) titanium and titanium alloy (Ti-6Al-4V) with a bimodal harmonic structure, which is defined as a coarse-grained structure surrounded by a network structure of fine grains, was fabricated using powder metallurgy to improve both the strength and ductility. Small fatigue crack propagation in bimodal harmonic structured titanium...
Similar publications
Highly-toughened blends, comprising polypropylene, polyamide 6, and maleic anhydride-grafted ethylene-propylene-diene monomer rubber (PP/PA6/EPDM-g-MA), of core–shell morphology are prepared and impact of microstructural development, at different PA6:EPDM-g-MA weight ratios (fixed at 30 wt%), on macroscopic mechanical and fracture characteristics o...
Some composites of alkali treated jute fibers and vinylester-isocyanate/urethane hybrid resin were fabricated. The mechanical, thermo-mechanical, fractographic and aging behavior of these composites were studied and compared with the parent vinylester resin (VER) matrix composites. Using hybrid resin matrix, the impact strength of jute composites w...
![Fig. 2. TEM bright field images along [001] zone axis in (a) PM-HIP and...](profile/Caleb-Clement/publication/364091245/figure/fig2/AS:11431281087962942@1664895567450/TEM-bright-field-images-along-001-zone-axis-in-a-PM-HIP-and-b-forged-specimens_Q320.jpg)
The nuclear power industry has growing interest in qualifying powder metallurgy with hot isostatic pressing (PM-HIP) to replace traditional alloy fabrication methods for reactor structural components. But there is little known about the response of PM-HIP alloys to reactor conditions. This study directly compares the response of PM-HIP to forged Ni...
Steels for ship building applications has to possess adequate resistance to propagation of fatigue cracks, as majority of the failures in service are due to metal fatigue. In this work, the fatigue crack growth rate (FCGR) behaviour within the Paris regime of two high strength low alloy (HSLA) steels were studied. In particular the experiments were...
Fatigue performance of cut edges is an important factor in structural design, especially when geometrical stress concentration factors (SCFs) are present. High power laser cutting systems have enabled efficient and fast fusion cutting with nitrogen as an assistant gas. The fusion cutting induces recast layer, which features crack-like defects close...
Citations
In order to examine the effects of soft-fine particle peening (Soft-FPP) on the fatigue properties of gas carburized SCM420H steel, rotating bending fatigue tests were conducted for carburized SCM420H steels treated with FPP using shot particles having different hardness. The Soft-FPP treated steels pre-treated with carburizing showed higher fatigue life and fatigue strength at 10⁷ cycles compared with the only-carburized steels. This is attributed to the increase of surface hardness and the generation of compressive residual stress induced by FPP. The carburized steels treated with FPP failed in the subsurface fracture mode from the singular microstructure beneath the carburized layer in the long life region. The transition stress for the carburized steels treated with FPP, at which the surface fracture mode changed to the subsurface one, tended to increase with the hardness of shot particles used in FPP. Furthermore, the release behavior of residual stress induced by FPP during fatigue tests was also examined. There were no noticeable differences in compressive residual stress after the fatigue tests between the two types of carburized specimens treated with FPP; therefore, the Soft-FPP treated steels exhibited same fatigue strength as the steels treated with FPP using hard shot particles. These results suggest that the effect of hardness of shot particles used in FPP on the fatigue properties of carburized steels is not observed.
Fullsize Image
