Effect of Cu Content on Microstructure and Tribological Properties of CoCrMo Alloy Fabricated by Selective Laser Melting

被引：0
|
作者：
Yue S. [1 ]
Shi W. [1 ]
Xie F. [1 ]
Pan C. [1 ]
Yan X. [2 ,3 ]
机构：
[1] Beijing Chunlizhengda Medical Instruments Co., Ltd., Beijing
[2] Guangdong Provincial Key Laboratory of Modern Surface Engineering Technology, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou
[3] National Engineering Laboratory of Modern Materials Surface Engineering Technology, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou
来源：
Surface Technology | 2024年 / 53卷 / 07期
关键词：
CoCrMoCu; friction and wear property; microstructure; miomedial metallic materials; selective laser melting; self-lubrication;
D O I：
10.16490/j.cnki.issn.1001-3660.2024.07.013
中图分类号：
学科分类号：
摘要：
The work aims to investigate the effect of different Cu contents on the microstructure and surface friction and wear properties of CoCrMoCu alloy prepared by selective laser melting (SLM). In order to achieve this, CoCrMo alloy powder and pure Cu powder were mechanically mixed with a planetary ball mill to prepare CoCrMo/Cu mixed powders with Cu contents of 2wt.%, 4wt.%, and 6wt.% respectively. The corresponding samples were then prepared by SLM technology, and their properties were tested and analyzed. The phase composition of the samples was first analyzed using X-ray diffraction (XRD). The results showed that the Cu content had no significant effect on the phase composition of the CoCrMoCu alloy prepared by SLM. In all the samples, the microstructure was mainly composed of cellular equiaxed grains. These results suggested that the addition of Cu did not significantly affect the microstructure of the CoCrMoCu alloy. The microstructure of the samples was further analyzed by scanning electron microscopy (SEM). The images showed that the CoCrMoCu alloys with different Cu contents had similar microstructures. The samples exhibited cellular equiaxed crystals, which were evenly distributed throughout the samples. This further confirmed that the addition of Cu did not significantly affect the microstructure of the CoCrMoCu alloy. The hardness of the samples was then tested with a Vickers hardness tester. The results showed that the hardness of the samples increased with the addition of Cu up to a certain point, and then decreased. The sample with 2wt.% Cu had the highest hardness of 429.2HV0.2, while the sample with 6wt.% Cu had the lowest hardness of 367.7HV0.2. These results suggested that the addition of Cu had a complex effect on the hardness of the CoCrMoCu alloy. The self-lubricating effect of Cu could enhance the hardness, but excessive Cu could decrease the hardness. Finally, the friction and wear properties of the samples were analyzed by wear friction tester. The results showed that the addition of Cu had a significant effect on the friction and wear properties of the CoCrMoCu alloy. The friction coefficient and wear rate decreased with the addition of Cu up to a certain point, and then increased. The sample with 4wt.% Cu had the lowest friction coefficient and wear rate, indicating the best friction and wear performance. The decrease in friction coefficient and wear rate was attributed to the self-lubricating effect of Cu. However, with further increase in Cu content, the friction coefficient and wear rate increased due to the decrease in hardness, and the wear mechanism changed from adhesive wear to abrasive wear. This study investigates the effect of different Cu contents on the microstructure, surface friction and wear properties of CoCrMoCu alloy prepared by SLM. The results show that the addition of Cu does not significantly affect the phase composition and microstructure of the CoCrMoCu alloy, but has a complex effect on the hardness as well as friction and wear properties. The sample with 4wt.% Cu exhibits the best friction and wear property, indicating that the Cu content is optimal for SLM CoCrMoCu alloys. © 2024 Chongqing Wujiu Periodicals Press. All rights reserved.
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页码：126 / 135
页数：9
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