Stainless steel products have been developed extensively, especially those made of duplex stainless steel, which is one of the most modern modifications of this material. They are characterized by a two–phase structure consisting of approximately equal content of ferrite and austenite. Such combination of properties makes the duplex stainless steels a very attractive material for numerous applications. The purpose of this study was to investigate the effect of surface layer alloying with chromium carbide on the microstructure and properties of the PM stainless steel. The multiphase sinters investigated in the study were prepared from two types of water–atomized steel powders: 316L and 409L. The technique of plasma spraying was used to deposit Cr3C2 on duplex stainless steel surface. Electric arc (GTAW method) was used for surface alloying. Optical and scanning microscopy, X–ray phase analysis and examinations of microhardness and coefficient of friction were performed in order to determine the microstructure and basic properties of sintered duplex steel after alloying. The surface alloying with Cr3C2 is a productive method of surface layer hardening in sintered stainless steels and modification of surface layer properties such as hardness and coefficient friction.Keywords: Surface alloying, sintered duplex stainless steel, chromium carbide
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