TC4表面单道与多道搭接激光熔覆自润滑涂层微观组织对比研究<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.04.011

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Abstract Ni60/20%WS₂ powder was precast on surface of TC4 alloy, and self-lubricating coating was then prepared by respectively adopting single-pass laser and multitrack laser cladding technology. The result showed that multitrack laser cladding was more likely to produce crack, and the cracking direction had a certain angle with the scanning direction. The main ingredients of multitrack laser-clad coating and single-pass laser-clad coating were the same, all produced lubricating phase and hard phase. But the former had lower distribution density of lubricating phase and hard phase, and coarser alloy grains. The microhardness of multitrack laser-clad and single-pass laser-clad coatings was 800-1 000HV_0.5 and 950-1 150HV_0.5 respectively. The grain refinement strengthening effect and higher hard phase concentration of single-pass laser-clad coating results in a relatively high microhardness compared to multitrack laser-clad coating.

Key words： titanium alloy multitrack laser cladding self-lubricating coating microstructure

Published: 02 May 2018

CLC number:	TG113.12
	TG174.4

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.04.011 OR http://www.mater-rep.com/EN/Y2017/V31/I4/47

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