Abstract
The aim of this study was to study the microstructure and tribology of a Fe–Cr–B-based alloy coating deposited by a controlled short-circuit metal inert gas welding process onto a 1020 carbon steel substrate with varying input energies. Microstructure analysis showed that the as-deposited alloy consisted of (Cr,Fe)2B particles embedded in a BCC solid solution matrix composed of Fe, Cr, Mn, and Si. The hardness of (Cr,Fe)2B particles was 24 GPa. When the input energy increased during welding process, the deposition volume and dilution ratio were increased. As a result, (Cr,Fe)2B particle volume fraction decreased from 44.6 to 37.2% and the bulk hardness decreased from 6.43 to 5.80 GPa. Dry sliding wear tests were carried out against a stainless steel counterface. The steady state coefficient of friction and the wear rate for the Fe–Cr–B-based alloy were independent of input energy. While the coefficient of friction for the Fe–Cr–B-based alloy was about 20% higher than for the 1030 carbon steel, the wear rate was about 90% lower. The dominant sliding wear mechanisms were adhesion and oxidation. Two-body abrasion wear test using alumina abrasives showed that the wear rate of the Fe–Cr–B-based alloy increased as the input energy increased and was about 90% lower than that of the 1030 carbon steel. The abrasive wear mechanism was microcutting.
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