Temperature field simulation of liquid nitrogen assisted laser cladding and analysis of friction and wear property of clad layer

doi:10.13251/j.issn.0254-6051.2024.06.038

Abstract

Abstract: Aiming at the process of preparing high-entropy alloy coating by liquid nitrogen assisted laser cladding, the temperature gradient and cooling rate of the clad layer under different liquid nitrogen application modes were analyzed by means of finite element analysis and experimental verification, and the theoretical basis of the influence of liquid nitrogen on the temperature gradient and cooling rate of the clad layer was revealed. The finite element simulation results show that when the laser power is fixed, the addition of liquid nitrogen assisted technology accelerates the cooling rate of the clad layer, increases the temperature gradient and reduces the residual stress. The maximum cooling rate is 8900 ℃/s, which is 1.505 times than that of air cooling. When the applied liquid nitrogen is fixed, the increase of laser power increases the temperature gradient of the clad layer and accelerates the cooling rate. The experimental results show that the addition of liquid nitrogen in the process of liquid nitrogen assisted laser cladding increases the hardness of the clad layer. When the laser power is 1500 W, the hardness increase is the most obvious, which is 1.3 times than that of air cooling. The friction coefficient of the clad layer is reduced, the average friction coefficient of the clad layer is 0.146, 0.256, 0.375, 0.351 and 0.382 at laser power of 1100-1900 W, which is lower than the average friction coefficient under air cooling condition. The wear volume of the clad layer is reduced. At laser power of 1700 W, the wear volume reduction is the most compared with that under air cooling condition, up to 55.4%, which improves the friction and wear property of the clad layer.

Key words: liquid nitrogen assisted, laser cladding, cooling rate, high-entropy alloy, friction and wear property

CLC Number:

TG166.7

Wang Kaiming, Jiang Fulin, Bu Shanfei, Wang Chao, Jiang Zhiyong, Liu Qingyu. Temperature field simulation of liquid nitrogen assisted laser cladding and analysis of friction and wear property of clad layer[J]. Heat Treatment of Metals, 2024, 49(6): 239-247.

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