Investigation on Microstructure and Wear Resistance of the Plain Carbon Steel Hardfaced by the Fe-Cr-C Electrodes Containing Mo, W, V Elements

Abstract

In this investigate, plain carbon steel cladded by SMAW in single, two and three- pass with two hardface electrodes containing molybdenum, tungsten, and vanadium. Scanning electron microscopy, X-ray diffraction, wear tests and microhardness test were carried out to evaluate the microstructure and wear properties of hardface layers. The results indicated that by increasing of molybdenum concentration in hardface layer, M₆C and M₇C₃ carbides were appeared in the microstructure. Moreover, by increasing the number of hardfaced layers and reducing dilution, the concentration of alloying elements, and the carbides coarser increased at microstructure. Also by increasing the percentage of the molybdenum the hardness of layers increased up to the 61 HRC and 1540 Vickers at the three-pass. In addition by increasing the number of passes the wear resistance of the hardfaced layers increased.