Microstructure and properties of laser alloyed Mo1 B,Cr,coating on 45 steel

doi:10.13251/j.issn.0254-6051.2020.09.028

Abstract

Abstract: Mo B,Cr,alloyed coating was prepared on the 45 steel substrate by laser alloying technology.The effect of Cr content on the microstructure and properties of the coating was studied.The results show that the best laser alloying process parameters for Mo,B.Cr.coating are laser power of 3.3 kW,scanning speed of 900 mm/min,overlap rate of 30%.By adopting this process,the coating shows a good metallurgical bonding with the substrate without voids and cracks,the alloying zone is composed of Fe-Mo,Fe2B,Fe-Cr,Cr,B,Cr,Fe,solid solutions and compounds,and the coating hardness,friction coefficient,and wear rate gradually decrease when the Cr content increases from1.1% to 23.3%.When the Cr content is 1.1%,the maximum coating hardness is 1005 HV0.1.When the Cr content is 23.3%,the wear resistance is the best,the friction cofficient is 0.475,the wear rate is0.574 x10 *m2/(N·m),and the form of coating wear is mainly a combination of abrasive wear and adhesive wear.

Key words: laser alloying, Mo B,Cr, alloyed coating, Cr content, microstructure, wear resistance

CLC Number:

TH117.1

Liu Dexin, Zhang Hongxing, Zhang Leitao, Zhang Weiqiang, Wang Xuesong, Dai Jiaoyan, Xu Jinfu. Microstructure and properties of laser alloyed Mo1 B,Cr,coating on 45 steel[J]. Heat Treatment of Metals, 2020, 45(9): 149-154.

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