【摘要】 运用光滑粒子流体动力学(smoothed particles hydrodynamics,SPH)法建立了激光熔凝过程的数值模型。并应用该模型对AISI304不锈钢的激光熔凝过程进行数值模拟,分析在不同激光功率和扫描速度下对熔池速度场、温度场及其宽度和深度的影响。结果表明:熔池的最高温度相对激光光斑中心偏移一定的距离,且偏移距离随扫描速度的增加而增大,但随激光功率的增加则保持不变。同时也为研究激光熔覆的自由表面形貌的形成过程提供SPH理论基础和数值分析方法。更多还原

【Abstract】 A numerical model of laser remelting process was established by smoothed particle hydrodynamics( SPH) method.Then the model was used to simulate the laser remelting process of AISI304 stainless steel.The influences of different laser powers and scanning speeds on the velocity field,temperature field and the width and depth of the melt pool were analyzed.The results show that the melt pool maximum temperature relative the laser spot center to offset a certain distance,and the offset distance increases with increasing the scanning speed,while with the increase of the laser power,the offset distance remains not changed.Meanwhile,it can be provides the SPH theoretical basis and a numerical analysis method to study the formation process of the free surface profile in laser cladding.更多还原