等激光能量密度下选区激光熔化TC4钛合金的表面形貌和硬度

以TC4钛合金粉末为原料,通过选区激光熔化工艺(Selective Laser Melting, SLM)成形试验并结合数值模拟,探讨了相等激光能量密度下,工艺参数对成形件性能的影响。结果表明:在等激光能量密度下,激光功率和扫描速度对熔池尺寸有着显著的影响；在本实验中铺粉层厚是影响试样表面粗糙度的最主要因素,最佳铺粉层厚为0.03mm；虽然激光能量密度相同,但是不同工艺参数组合依然会影响试样的表面形貌和微观组织；等激光能量密度下不同的工艺参数组合对SLM沉积态的表面硬度没有发现显著影响。

Study on Surface Morphology and Hardness of TC4 Titanium Alloy by Selective Laser Melting at Equal Laser Energy Density

Using TC4 titanium alloy powder as raw material, Selective Laser Melting (SLM) forming experiments and numerical simulation were conducted to investigate the influence of process parameters on the properties of the forming parts with equal laser energy density. The results show that the laser power and scanning speed have significant effects on the molten pool size at the constant laser energy density; In this experiment, the powder layer thickness is the most important factor affecting the surface roughness of the sample, and the optimal powder layer thickness is 0.03mm; Although the laser energy density is the same, the surface morphology and microstructure of the sample are still affected by the combination of different process parameters; No significant effect was found on the surface hardness of SLM deposition under different process parameter combinations at equal laser energy density.