Numerical simulation and experimental verification on melting behavior of Ni60A alloy coating on titanium alloy by laser cladding

doi:10.13251/j.issn.0254-6051.2024.04.038

Abstract

Abstract: In order to accurately predict the geometric morphology and dynamic melting behavior of the clad layer during coaxial powder feeding laser cladding, a multi physical field coupled numerical model for the laser cladding of Ni60A alloy coating on Ti6Al4V alloy surface was proposed by using COMSOL Multiphysics^ software and verified by single laser cladding test. The results indicate that the deviation rates between simulation results and experimental measurements in the cross-sectional width, height, depth and dilution ratio of the clad layer are -2.63%, 12.19%, 4.55% and -1.94%, respectively, which preliminarily verifies the reliability of its prediction of geometric morphologies. Besides, in order to investigate the melting behavior of the Ni60A alloy coating, the distribution maps of temperature gradient G and solidification rate R in the molten pool were further obtained by the simulation, and combined with SEM observation and characterization, the relationship between grain characteristics and solidification parameters was established. It is found that the types of grains (planar, columnar and equiaxed) are mainly influenced by temperature gradients and undercooling at the solidification interface, while the grain sizes are mainly controlled by the solidification rate.

Key words: laser cladding, Ni60A alloy coating, geometric morphology, solidification parameter, grain

CLC Number:

TG174.4

Gong Yuling, Gong Fei, Chen Lin, Xu Xiaodong, Zhong Yihui, Huang Yunchao. Numerical simulation and experimental verification on melting behavior of Ni60A alloy coating on titanium alloy by laser cladding[J]. Heat Treatment of Metals, 2024, 49(4): 237-243.

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