45钢喷射电镀Ni层激光重熔温度场数值模拟及参数优化

Numerical Analysis and Parameter Optimizing on Temperature Field of Laser Re-melted Ni-Coating Oriented by Jet Electroforming of 45 Steel

研究了45钢喷射电镀Ni层激光重熔温度场的分布规律,考虑了热物性参数、对流换热、相变潜热等随温度变化的因素,应用ANSYS有限元分析软件,建立了连续移动三维瞬态激光重熔喷射电镀Ni层温度场的计算模型。为了在喷射电镀Ni层激光重熔过程中获得表层质量较好,且尽量厚的硬化层,利用建立的模型,通过选择合适的激光加工工艺(激光功率、扫描速度和光斑半径),获得了较为理想厚度的硬化层。

Distribution regularity of the temperature field is studied according to the heat transfer theory and numerical simulation method. Considering the thermophysical parameters, heat convection and phase-change latent heat, the computing model of transient temperature field of 3-D moving jet electro-plated coating laser re-melting is built with finite element method. In the laser re-melting process of jet electroplated nickel coating, to obtain a model of the thick hard zone and good-quality superficial coat, appropriate laser processing parameters, such as laser power, scanning speed and facular radius, are selected, thus obtaining the ideal hard zone.