再制造HT250基体的亚激光瞬间熔技术工艺参数优化

Process Parameter Optimization of Remanufactured HT250 Matrix by Sub Moments of Laser Cladding Technology

工艺参数的选取对再制造产品的表面质量至关重要。采用亚激光瞬间熔技术修复了HT250基体的表面缺陷,并利用响应曲面法(RSM)和有限单元法(FEM)对其修复过程的工艺参数进行了优化。同时详细分析了输入功率P、单次修复时间t、速度V和保护气体流量G等4个因素对修复后试样抗拉强度的影响。研究结果表明:抗拉强度受输入功率和单次修复时间影响显著,而对其它元素呈弱依赖性。HT250基体的亚激光瞬间熔技术的最优工艺参数为输入功率2 800 W,持续时间0.57s,速度6.5mm/s,气体流量3L/min。

The selection of the process parameters of the sub laser flash smelting is essential for the surface quality of the remanufacturing products. The surface defects of HT250 substrate were repaired by sub moments of laser cladding technology, the process parameters were optimized by using response surface method （RSM） and finite element method （FEM）, and the effect of in detail power, processing time, velocity and gas flow on tensile strength of remanufactured sample were also analysized in detail. It is found that the tensile strength is significantly influenced by the input power P and single repair time t, while the influence of other factors is weak. The optimal remanufactured HT250 matrix condi-tions are input power of 2 800 W, processing time of 0.57 s, speed of 6.5 mm/s, and gas flow of 3 L/min.