Uniformly Dispersed Carbide Reinforcements in the Medium-Entropy High-Speed Steel Coatings by Wide-Band Laser Cladding

Bang Dou^1,2，Hui Zhang^3,2，Jia-Hao Zhu¹，Ben-Qi Xu¹，Zi-Yi Zhou⁴，Ji-Li Wu⁴

1. Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials (Ministry of Education), Anhui University of Technology2. School of Materials Science and Engineering, Anhui University of Technology3. Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials(Ministry of Education) , Anhui University of Technology4. School of Materials Science and Engineering, Jiangsu University

摘 要：A medium-entropy high-speed steel（ME-HSS）coating with the 76 at.%of Fe and multiple alloying elements was prepared by the wide-band laser cladding.Compared with the commercial W₆ Mo₅ Cr₄ V₂（M2）HSS coating which contains a large number of network lamellar M₂ C-type carbides along the grain boundaries,the presented ME-HSS coating has a high quantity of fi ner and more uniformly dispersed M C-type carbides;on the other hand,the coating has less retained austenite and much lower brittleness as well as similar secondary hardening eff ect and tempering hardness.

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