Effect of scanning speed on microstructure and properties of 316L stainless steel coatings by high-speed laser cladding

doi:10.13251/j.issn.0254-6051.2023.08.040

Abstract

Abstract: 316L stainless steel coating was prepared on 27SiMn steel substrate by high-speed laser cladding technology, the surface morphology, microstructure, microhardness and friction and wear properties of the clad coating were tested and analyzed. The effect of scanning speed on microstructure and properties of high-speed laser clad coating was studied. The results show that, when the scanning speed is 75 mm/s, the coating quality and metallurgical combination effect is the best. The coating microstructure is uniform, the joint is dominated by cellular crystals, and the middle and upper part is dominated by columnar crystals and equiaxed dendrites without secondary crystal arms, with the increase of scanning speed, the grain is obviously refined. When the scanning speed is 105 mm/s, compared with the coating at scanning speed of 45 mm/s, the microhardness increases from 210.4 HV0.5 to 391.5 HV0.5, which increases by 1.87 times. The friction coefficient of the coating is 0.521, and the wear loss is 2 mg. Therefore, the macroscopic properties of the coating can be significantly improved with the increase of scanning speed, and the microhardness and wear resistance of the coating can be improved by the fine grain strengthening at high scanning speed.

Key words: high-speed laser cladding, friction and wear, microstructure, microhardness

CLC Number:

TG174.44

He Wei, Wang Yanyan, Shu Linsen. Effect of scanning speed on microstructure and properties of 316L stainless steel coatings by high-speed laser cladding[J]. Heat Treatment of Metals, 2023, 48(8): 248-253.

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