Microstructure and property of Co-based carbide composite coating fabricated by laser cladding on 40Cr tool steel surface

被引：0

作者：

Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming ^{[1
]}

Yunnan

650093, China

机构：

[1] Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, Yunnan

来源：

Zhongguo Jiguang | / 11卷

关键词：

40Cr steel; Ceramic composite coatings; Laser cladding; Laser technique; Microstructure; Wear behavior;

D O I：

10.3788/CJL201542.1103002

中图分类号：

学科分类号：

摘要：

WC/Co, WC/Co50 and WC-TiC/Co50 carbide composite coatings are prepared by laser cladding process on 40Cr tool steel surface through designing different composition ratio of WC, TiC, Co and Co50 powder. The influence of laser cladding process parameters and powder composition ratio on the composite coating phase structure, macroscopic morphology and microstructure are investigated by X-ray diffraction (XRD), optical microscope (OM), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS), respectively. The results show that the WC/Co50 and WC-TiC/Co50 composite coatings surface morphology is good, smooth and without continuous macroscopic crack under the laser power of 4.2 kW and scanning speed of 350 mm·min-1 conditions. Hardness and friction wear tests indicate that the composite coating has high hardness and good wear resistance, the highest microhardness is 1211 HV0.2 and the minimum wear weight loss is 2.1 mg. The maximum microhardness and minimum wear weight loss is 3.03 times and 34.4% of the substrate, respectively. A lot of WC, TiC and in-situ W2C, Fe3W3C carbide reinforced phases play a major role on improving the cladding coating hardness and wear resistance. © 2015, Chinese Laser Press. All right reserved.

引用

页数：6

共 23 条

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