STUDY OF DUPLEX STAINLESS STEEL MICROSTRUCTURE WITH TITANIUM PERCENT CHANGE BY ESR PROCESS

摘要

In this study examines the effect of titanium on the duplex stainless steel microstructure by ESR process. Duplex stainless steels consist the phases of ferrite and austenite. These steels are usually generated by ESR process, therefore have high strength, toughness and corrosion resistance. In these steels, titanium plays an important role. The adsorbed of titanium ingots has been different the surface to the center during the ESR process. Chemical analysis showed The absorbed titanium inthe center is less of surface. In this case, other alloying elements are unchanged at various distances from the surface. Analysis of the heterogeneity of titanium caused with the difference microstructure, with increasing of titanium in the surface samples, free carbon is low and remove carbide titanium, with decreasing dissolved carbon, the formed martensite become less and martensitic structure with increasing percentage of titanium turns ferritic austenitic structure.