Effect of Chromium Content on Microstructure and Wear Resistance of Fe-Cr-C Hard facing Layers
نویسنده
چکیده
Layers of Fe-Cr-C Hard facing material containing various amounts of chromium were deposited on mild steel base metal. Optical Microscope (OM), Scanning Electron Microscope (SCM) and X-ray diffraction (XRD) were used to investigate the effect of chromium content of micro structural characteristics of Fe-Cr-C hard facing layers. The M7C3 carbide refinement mechanism exists on base metal. The experimental results show the micro structure of Fe-Cr-C hard facing layers consists of primary (Cr, Fe)7C3 carbide and the eutectic phases. In the solidification process and growth of the primary (Cr, Fe)7C3 carbides occur along there long axis which parallels the direction of heat flow. With the increase of chromium content, the primary (Cr, Fe)7C3 carbides were refined how here it is not proper to increase chromium content without limits. Chromium based alloys are extensively used in the valve industries for wear application, since the possess high resistance to wear plastic deformation at elevated temperature above 750°C. Shielded Metal Arc Welding (SMAW) as been in use for many years however some major issues still exists regarding the ability of the SMAW process to deposit sound welds on high interigity application.
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