Path selection and quality analysis of laser clad CoCrMo strengthened coating on titanium alloy surface

doi:10.13251/j.issn.0254-6051.2021.05.036

Abstract

Abstract: In view of the poor surface hardness and wear resistance of titanium alloy, commonly used as artificial bone material in biomedicine, a new type of high hardness wear-resistant clad layer was prepared on pure titanium plate by laser cladding with CoCrMo powder. In order to ensure the clad layer quality, three different scanning paths were designed, including unidirectional overlapping, rectangular nested overlapping and circular spiral overlapping. The results show that through the micro and macro structure comparison of laser clad specimens under three different scanning paths, it is found that the surface quality of laser clad specimens obtained by unidirectional overlapping is the best, and the microstructure of which is the best. Therefore, the best specimens prepared by unidirectional overlapping were selected to further test and analyze the hardness and wear resistance. It is found that compared with the substrate, the hardness of the clad layer is significantly improved by 5-6 times of that of the substrate, and the wear resistance is also improved significantly.

Key words: titanium alloy, laser cladding, CoCrMo powder, surface modification, process optimization

CLC Number:

TG146.2

Shang Peng, Li Jingman, Zhang Yihai, Zhang Jie, Xia Lei, Zhang Dawei. Path selection and quality analysis of laser clad CoCrMo strengthened coating on titanium alloy surface[J]. Heat Treatment of Metals, 2021, 46(5): 207-212.

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