Preparation of Composite Coating by High Temperature Relaxation Softening Zone Aided with Laser Cladding

WU Cheng-meng, FENG Ai-xin, WU Xu-hao, YU Man-jiang, ZHANG Cheng-long, XU Guo-xiu

Surface Technology ›› 2022, Vol. 51 ›› Issue (3) : 353-362.

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PDF(6343 KB)
Surface Technology ›› 2022, Vol. 51 ›› Issue (3) : 353-362. DOI: 10.16490/j.cnki.issn.1001-3660.2022.03.038

Preparation of Composite Coating by High Temperature Relaxation Softening Zone Aided with Laser Cladding

  • WU Cheng-meng1, FENG Ai-xin1, YU Man-jiang1, ZHANG Cheng-long1, XU Guo-xiu1, WU Xu-hao2
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Abstract

The work aims to study the law of inhibiting the failure of thermal fatigue crack and adhesive wear on the surface of glass punch. The composite coating was prepared by high temperature relaxation softening zone aided with laser cladding, and the effect of high temperature relaxation softening zone on the structure and wear resistance of composite coating was studied with Ni60+35% WC (mass fraction) powder as a composite coating material, 45# steel as base material, and 316 stainless steel mesh as high temperature relaxation softening zone. Before adding 316 stainless steel mesh, the surface abrasion and friction coefficient of the composite coating were 0.04 g and 0.32 respectively. In addition, the width of the wear scar on the surface of the composite coating was (2120±250) μm The residual tensile stress was large and unevenly distributed, accompanied by a large number of cracks. After adding 316 stainless steel mesh, the surface abrasion and friction coefficient of the composite coating were 0.03 g and 0.25, respectively, the width of the wear scar was (1202±100) μm. The residual tensile stress was small and evenly distributed. The 316 stainless steel mesh can absorb the residual tensile stress of composite coating, inhibit the propagation of cracks and even form a crack-free composite coating, so that the longitudinal and transverse residual stress distribution of composite coating surface can be balanced. At the same time, the surface of the composite coating had high wear resistance and hardness due to the simultaneous addition of Ni60+35% WC (mass fraction) powder. The final result fully shows that, high temperature relaxation softening zone aided with laser cladding on the surface of the glass punch can significantly improve the hardness and wear resistance of the composite coating, and inhibit the generation and propagation of surface cracks of the composite coating.

Key words

laser cladding; composite coating; high temperature relaxation softening zone; residual tensile stress; crack

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WU Cheng-meng, FENG Ai-xin, WU Xu-hao, YU Man-jiang, ZHANG Cheng-long, XU Guo-xiu. Preparation of Composite Coating by High Temperature Relaxation Softening Zone Aided with Laser Cladding[J]. Surface Technology. 2022, 51(3): 353-362
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