Microstructure and wear behavior of WC/Co50 composite coatings on 40Cr cutting tool surface prepared by laser cladding

被引：0

作者：

Liu H. ^{[1
]}

Leng N. ^{[1
]}

Zhang X. ^{[1
]}

Jiang Y. ^{[1
]}

机构：

[1] School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming

来源：

Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | 2016年 / 45卷 / 01期

关键词：

40Cr steel; Laser cladding; Microstructure; WC/Co50 composite coating; Wear behavior;

D O I：

10.3788/IRLA201645.0120001

中图分类号：

学科分类号：

摘要：

WC/Co50 cladding coating was fa bricated on 40Cr cutting tool surface by 6 kW transverse-flows multimode CO2 laser apparatus. The surface morphology, phase composition, microstructure, microhardness and wear behavior of the cladding coating were analyzed by optical microscope (OM), scanning electron microscope (SEM), energy disperse spectroscopy (EDS), X-ray Diffraction (XRD) hardness tester and friction wear testing machine. The results show that the original WC particles were dissolved greatly under the action of high-energy laser beam. The phase of coating is mainly composed of carbides WC, W2C, (Cr,Fe)7C3, M6C and Fe-Cr solid solution. The microstructure of WC/Co50 coating is complex, which consists of the primary dendrites, cellular eutectic, interdendritic eutectic and hard phase particles. The average hardness of the WC/Co50 coating is 1.93 times of the substrate, and the hardness of WC/Co50 cladding coating decreases with the increase of the surface depth. Under the same conditions, the wear weight loss of the composite coating is only 13.3% of the substrate. © 2016, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.

引用

页数：6

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