Laser fabricated nickel-based coating with different overlap modes

ABSTRACT

Ni204 cladding layers were prepared on the surface of 45# steel alloys via laser cladding under different overlap modes. The effects of overlap modes on microstructure evolution, microhardness, wear resistance, compressive and tensile strength were investigated. The intensity of the diffraction peaks is related to the cladding strategy. The remelting mode introduced by “double vertical cross” reduces the cooling rate and improves the uniformity of microstructure, exhibiting a stability of the microhardness and wear resistance. Cr_0.19Fe_0.7Ni_0.11, [Fe, Ni], and Ni–Cr–Nb–Mo are primary detected phases in the cladding layer. With the increase in overlap uniformity, the content of [Nb, Mo] which precipitated in grain boundary increases and the microstructure is refined. The uniform microstructure distribution promotes the stable distribution of microhardness and friction coefficient. The angle between the extension direction of the overlap area and the applied loading directly determines the performance of the Ni204 alloy after yielding. The inter-laminar overlap mode weakens the effect of shear stress induced by microstructure differences.

KEYWORDS:

• Laser cladding
• Ni204 alloy
• overlap mode
• microstructure
• mechanical property

Additional information

Funding

This work was supported by the Fundamental Research Funds for the Central Universities [N180306004]; The Ministry of Industry and Information Technology of China under Grant [No. 201675514]; The Science and Technology Planning Project of Shenyang under Grant [No.18006001].