In this article, by using orthogonal test the technological test was conducted and the optimum processing of the remanufacturing35CrMoA axle were obtained. The evolution of microstructure and mechanical property of HAZ were investigated. The microstructure of HAZ was characterized by means of OM and SEM. Meanwhile hardness distribution in HAZ and tensile property of cladding-HAZ-substrate samples were measured. The microstructure of cladding and HAZ were observed. The microsturcture evoltion and the mechanism of harden in the HAZ was discussed and revealed. The results indicated that the remanufacturing part has excellent strength due to grain refining and dispersive distribution of nanoscale cementite. The remanufacturing part will have uniform microstructure and hardness matching with that of 35CrMoA axle by using stress-relieving annealing at 580℃.
In this article, the laser cladding on LZ50 axle steel was conducted to investigate the evolution of microstructure and mechanical property of HAZ. Based on the quality of cladding formation and thermal damage evaluation in the HAZ, the optimal process parameters was obtained as 7.8g/min powder feeding rate,420mm/min scanning rate and other constant settings. The microstructure of HAZ was characterized by means of OM and SEM. Meanwhile hardness distribution in HAZ and tensile property of cladding-HAZ-substrate samples were measured. The results indicate that, Two types of HAZs were observed under different cladding strategies: gradually changed microstructure during thin-layer cladding process and relatively uniform microstructure during multi-layer cladding process..Due to different maximum temperature of thermal cycle, HAZ and substrate have partial surface hardening during the laser cladding process. The mechanism of hardening was discussed. The final microstructure after complex thermal cycles result hardening behavior in both HAZ and substrate.
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