镍铁合金激光熔覆工艺参数优选研究

镍铁合金具有耐腐蚀、耐高温等优良性能, 逐渐成为一种极具发展潜力的高温结构材料。针对镍铁合金在激光熔覆时易出现裂纹等缺陷, 研究了质量比mIN625/m304L=1∶3的镍铁合金未出现缺陷的激光熔覆工艺参数。通过光学显微镜和扫描电子显微镜对单道、横向搭接和纵向搭接的宏观形貌进行了观察。结果表明, 单道中不存在缺陷, 横向搭接中存在裂纹和熔道波动, 纵向搭接中存在熔道倾斜; 以单道、横向搭接和纵向搭接中存在的缺陷为筛选条件, 优选出了镍铁合金激光熔覆无缺陷的激光功率为0.6 kW, 扫描速度为6 mm/s、8 mm/s、10 mm/s。

Abstract

Nickel-iron alloy has excellent properties such as corrosion resistance and high temperature resistance, and has gradually become a high-temperature structural material with great development potential. Aiming at the defects such as cracks in nickel-iron alloy during laser cladding, the laser cladding process parameters without defects of nickel-iron alloy with mass ratio were researched. The macroscopic morphology of single, horizontal overlap and longitudinal overlap was observed by optical microscopy and scanning electron microscopy. The results show that there are no defects in a single, cracks and melt waves are present in the horizontal overlap, and there is a melt fluctuation in the longitudinal overlap. With the defects existing in the single pass, the horizontal overlap and the longitudinal overlap as the screening conditions, the laser power of the nickel-iron alloy laser cladding without defects is preferably 0.6 kW, and the scanning speed is 6 mm/s, 8 mm/s, 10 mm/s.

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张佩强, 王传洋, 王呈栋. 镍铁合金激光熔覆工艺参数优选研究[J]. 应用激光, 2019, 39(6): 915. Zhang Peiqiang, Wang Chuanyang, Wang Chengdong. Study on Optimization of Laser Cladding Process Parameters of Nickel-iron Alloy[J]. APPLIED LASER, 2019, 39(6): 915.

镍铁合金激光熔覆工艺参数优选研究

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