MODIFICATION OF THE SURFACE LAYER OF SINTERED DUPLEX STAINLESS STEELS THROUGH ALLOYING USING THE GTAW METHOD
Journal Title: Tribologia - Year 2018, Vol 278, Issue 2
Abstract
The demand for materials obtained using powder metallurgy (PM) is constantly increasing, especially on SDSSs, which are characterized by a two–phase structure consisting of ferrite and austenite. The main purpose of this study was to examine the effect of surface layer alloying with chromium carbide on the microstructure and tribological properties (e.g., hardness and wear resistance) of SDSSs. The multiphase sinters were prepared from two types of water–atomized steel powders: 316L and 409L. The technique of the APS method was used to deposit Cr3C2–NiAl powder on the SDSS 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 SDSS after alloying. The surface alloying with Cr3C2 improves tribological properties of SDSSs such as hardness and the coefficient of friction.<br/><br/>
Authors and Affiliations
Barbara LISIECKA, Agata DUDEK
Keywords
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