Abstract
In-situ formed high Mn steel reinforced by carbides was fabricated by laser surface alloying with Mn + Cr3C2 and Mn + NiCr-C powders to improve the wear and corrosion behavior of 1Cr18Ni9Ti steel. Microstructure, phases, element distribution, microhardness, wear and corrosion behavior of the laser alloyed layers were investigated. Results indicated that high Mn steel matrix composites with austenite dendrites, eutectics and pine-needle shaped colonies were formed by laser surface alloying. Furthermore, there are lots of large block primary Cr7C3 in the layer alloyed with Mn + Cr3C2. An improvement in average microhardness in the matrix of both alloyed layers was achieved. The layer alloyed with Mn + NiCr-C showed the best wear and corrosion resistance, which is closely related to microstructure uniformity, Cr distribution, formed phases, type and content of carbides, microhardness and toughness of the alloyed layers.
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