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This paper analyzes the corrosion resistance and the mechanical and microstructural properties of a welded joint of ductile cast iron using AISI316L stainless steel as filler material and three different heat treatments: preheating at 250 and 450 ºC and a post-weld annealing treatment. The results show the presence of ledeburite at the interface be...
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Context 1
... base material used in this paper was a nodular ferritic-perlitic cast iron with a percentage of pearlite of approximately 40%. In this type of casting graphite appears in a nodular shape surrounded by ferrite (Fig. 1), avoiding the graphite sheets that appear in lamellar grey cast iron and act as discontinuities that generate large stress concentrators, reducing the mechanical properties of the alloy. The filler material was an AISI 316L stainless steel ER rod, whose main alloy elements are Cr and Ni, but also contains Mn and Mo. Mo improves its ...
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This study investigated the evolution of microstructure and mechanical properties of 25 mm thick S11306 ferritic stainless steel welded joints during Post weld heat treatment (PWHT) by a series of tests, including the optical microscope observation, hardness test, tensile test, bending test, and scanning electron microscope tests. The experimental...
Citations
... The substrate iron matrix with less graphite and carbon in matrix of cementite/bainitic/martensitic would also help produce a good metallurgical bonding during the micro welding action, too. The high carbon content presents difficulty in weldability of steels in general (Cárcel Carrasco et al., 2022). The melting point of the alloy of substrate and electrode material is likely to rise above 1600 ºC, on the other hand, graphite sublimates at 3550 ºC, which shows that graphite is significantly heat-resistant enough to withstand the temperature of molten metal which remains as alloying liquid very briefly during the coating process. ...
Nodular cast irons are used in many industrial applications such as machine frames and body, rollers and engine blocks due to their higher strengths and ductility with good machinability comparable to grey cast irons. In this study, the outer surface of nodular cast irons (GGG-60) was coated with WC/Co using electro spark deposition (ESD). The aim of the study is to improve both the surface quality and wear behaviour with the coatings formed on the surface of the plastic deformation rollers, whose wear resistance decreases over the time due to high stress working conditions. Heat treatment at 950 ºC for 2 h was applied to the GGG60 specimen rollers and half of the rollers were uncoated and the other half was coated with WC-Co electrodes. The wear behaviour of the heat treated and coated surfaces was measured by ball-on-disc wear method using Al2O3 ball bearing with a diameter of 6 mm for a sliding distance of 250 m at a sliding rate of 6.5 m·s-1 under a dry condition, and using a load of 40 N. WC/Co coatings were successfully applied to rollers. In the SEM/EDS images, the presence of W, Fe, C, Co and Al elements in the coated part of the rollers and Fe, C and Al elements in the uncoated region were detected. It was concluded that Coating and heat treatment increased the wear resistance by nearly 5 times and decreased the friction coefficient by 2.13 times.
