Microstructure and properties of laser clad Ni-Al composite coatings on Cr12MoV steel

doi:10.13251/j.issn.0254-6051.2021.11.040

Abstract

Abstract: Ni-Al composite coatings on Cr12MoV steel were fabricated by laser cladding technology and the effect of Al content on structure and mechanical properties of the clad layer was studied. The results show that when the Al content is more than 14%, cracks begin to appear. There is no obvious inclusion in the clad layer, but there are hard phases Al₂O₃ and intermetallic compounds Ni₃Fe and AlNi₃in the clad layer. As the Al content increases, the boundary of molten pool gradually disappears, and the hardness and wear resistance decrease firstly and then increase. On the whole, the clad layer with 14% Al has the best performance.

Key words: laser cladding, Ni-Al composite coatings, microstructure, microhardness, friction and wear

CLC Number:

TG665

Chen Zixin, Zhou Houming, Zhu Yuxu, Zhang Zhehao, He Fangjia, Xu Caixing, Liu Gang. Microstructure and properties of laser clad Ni-Al composite coatings on Cr12MoV steel[J]. Heat Treatment of Metals, 2021, 46(11): 226-231.

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