Abstract
Modified Hadfield steel represents as a new grade of high manganese steel, that is ladle-treated instead of long-term heat treatment process. It has an odd structure, in which austenite is reinforced by new eutectic constituent. Regarding the segregation coefficient of alloying elements, in particular Mn, and C, alteration in SFE is significantly affected. Reduction in stacking fault energy (SFE) value promotes the strain hardening mechanism of austenite structure and consequently on the wear performance of Hadfield steel. Based on SFE of austenite structure, the wear abrasion resistance of conventional heat-treated Hadfield steel and ladle-treated Hadfield steel was detected under either low or high gouging wear abrasion conditions. OM and SEM observations show that micro-plowing mechanism is dominant at ladle-treated Hadfield surface, while micro-cutting mechanism is strongly observed at the surface of conventional Hadfield steel. By using XRD and colored etching technique, it was observed that e-lath martensite and slip bands are strongly generated through the strain hardening mechanism in a ladle-treated Hadfield steel. As a result of micro-plowing and e-martensite, ladle-treated Hadfield steel performs better than conventional Hadfield steel either at low or high gouging applications.
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