Heat-affected zone microstructure and mechanical properties evolution for laser remanufacturing LZ50 axle steel

机译：LZ50车轴钢激光再制造的热影响区组织和力学性能演变

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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.

机译：在本文中，对LZ50车轴钢进行了激光熔覆，以研究HAZ的组织和力学性能的演变。根据热影响区的熔覆层形成质量和热损伤评估，获得了最佳工艺参数：7.8g / min粉末进料速度，420mm / min扫描速度和其他恒定设置。通过OM和SEM表征了热影响区的微观结构。同时测量了HAZ中的硬度分布和包层-HAZ-基体样品的拉伸性能。结果表明，在不同的熔覆策略下观察到两种类型的热影响区：薄层熔覆过程中的组织逐渐变化，多层熔覆过程中的组织相对均匀。激光熔覆过程中的部分表面硬化。讨论了硬化机理。经过复杂的热循环后的最终微观结构会在热影响区和基材中产生硬化行为。

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《Conference on Applied Optics and Photonics China》|2017年|104571X.1-104571X.6|共6页
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Feng Xiangyi; Dong Shiyun; Fang Jinxiang; Yan Shixing; Xu Binshi; Pan Fusheng;
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Laser cladding; Heat-affected zone; LZ50 axle steel; microstructure and mechanical evolution;

机译：激光熔覆;热影响区; LZ50车轴钢;显微组织与力学演变;

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4. Heat-affected zone microstructure and mechanical properties evolution for laser remanufacturing LZ50 axle steel [C] . Feng Xiangyi, Dong Shiyun, Fang Jinxiang, Conference on Applied Optics and Photonics China . 2017

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Heat-affected zone microstructure and mechanical properties evolution for laser remanufacturing LZ50 axle steel

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