Microstructure Evolution and Tribological Properties of Laser Cladding Ni60 / Cu Self-lubricating Composite Coatings on 45# Steel

被引：0

作者：

Wang Q. ^{[1
]}

Liu X. ^{[1
,2
]}

Liu Q. ^{[1
]}

Wang G. ^{[1
]}

Zhang S. ^{[1
]}

Zhang L. ^{[2
]}

机构：

[1] Hunan Province Key Laboratory of Materials Surface / Interface Science & Technology, Central South University of Forestry & Technology, Changsha

[2] Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials of Ministry of Education, Anhui University of Technology, Maanshan

来源：

Zhongguo Biaomian Gongcheng/China Surface Engineering | 2022年 / 35卷 / 06期

基金：

中国国家自然科学基金;

关键词：

45# steel; laser cladding; Ni60 / Cu self-lubricating composite coating; solid lubrication;

D O I：

10.11933/j.issn.1007-9289.20220428002

中图分类号：

学科分类号：

摘要：

To improve the low surface hardness and poor wear resistance of 45 # steel and broaden its application range in industrial production, three kinds of wear-resistant composite coatings of Ni60, Ni60-10%Cu and Ni60-20%Cu (wt.%) are prepared on the its surface by laser cladding technology. The microstructure, microhardness and tribological properties of the three coatings are investigated. The results show that the N1 coating mainly includes γ-Ni solid solution, Cr7C3 hard phase and FeNi3 intermetallic compound, and the N2 and N3 coatings contain extra solid lubricant Cu. In terms of performance, the microhardness of N1 (730.41 HV0.5 ), N2 (653.04 HV0.5 ) and N3 (592.29 HV0.5 ) coatings is higher than that of the substrate, which is 2.44, 2.18 and 1.98 times higher than that of the substrate (299.20 HV0.5 ), respectively. At room temperature, the N3 coating shows excellent friction reduction performance, and the friction coefficient is 8.5 % lower than that of the N1 coating. The N2 coating shows excellent wear resistance, and the wear rate is 1.74×10−5 mm3(N·m). However, after the addition of 20 % Cu, the support of the coating on the hard phase decreases, resulting in the stripping of the coating on the hard phase, thus damaging the lubricating film and increasing the wear rate. However, at 600 ℃, N1 coating has the best friction reduction performance, and the friction coefficient decreases by 50.7 % compared with the substrate. The wear resistance of N2 coating is the highest, and the wear rate is 5.99×10−5 mm3(N·m), which is lower than that of N3 coating, 9.02×10−5 mm3(N·m). This is because the protective effect of solid lubricant Cu on the coating is not enough to offset the negative impact of the decrease of coating hardness. This paper provides reference for the addition of solid lubricating phase Cu to the Ni60 composite powder, and then prepare self-lubricating composite coating. © 2022 Chinese Mechanical Engineering Society. All rights reserved.

引用

页码：232 / 243and256

共 36 条

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