Laser cladding remanufacturing process of aircraft landing gear based on 30CrMnSiNi2A steel

doi:10.13251/j.issn.0254-6051.2021.06.010

Abstract

Abstract: 20%WC-Ni composite coating was prepared on the surface of 30CrMnSiNi2A steel. The effects of laser cladding process parameters (laser power P, defocusing amount L, scanning speed V) on the microstructure and properties of the coating were studied by means of laser cladding technology with orthogonal experiment. The results show that the influence of process parameters on the microhardness of the coating is in the order of P>L>V. The orthogonally optimized process parameters are P=1800 W, L=-20 mm, V=5 mm/s, the coating prepared by using these parameters has compact microstructure and good bonding with the substrate, and its hardness reaches 542 HV0.2. The mass loss of this coating is only 25.92% of that of the matrix material under dry friction condition; the electrochemical corrosion rate is 0.0025 mm/a, which is only 1.37% of that of the matrix material; the surface of the coating maintains good performance under 1000 h salt spray condition.

Key words: laser cladding, 20%WC-Ni coating, geometrical appearance, microstructure, microhardness, wear resistance, corrosion resistance

CLC Number:

TG665

Chen Zixin, Zhou Houming, Xu Caixing, Da Limei, Zhu Yuxu, He Fangjia, Wang Zeda. Laser cladding remanufacturing process of aircraft landing gear based on 30CrMnSiNi2A steel[J]. Heat Treatment of Metals, 2021, 46(6): 45-52.

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