对H13钢粉末材料进行了激光选区熔化(SLM)成形,通过改变激光功率、扫描速度、扫描间距、扫描方式等参数,对比研究了工艺参数对试件成形缺陷的影响规律。结果表明,在一定激光功率和扫描速度范围内,增大激光功率或减小扫描速度有利于试件的成形;过大或过小的扫描间距都会影响成形质量,形成气孔或未熔合缺陷;相对于Z型正交扫描和单X方向扫描, S型正交扫描的成形件质量最好。

The formation of H13 steel powder material is conducted by using the selective laser melting(SLM) technology, and the influence rules of process parameters on the forming defects are obtained via a comparative study by changing the parameters including laser power, scanning speed, scanning pitch and scanning method. The results show that, in a certain range, the increase of laser power or the decrease of scanning speed is beneficial to the formation of parts. A too large or too small scanning pitch has a significant impact on the forming quality and thus the pores or fusion-incomplete defects occur. The quality of forming parts under S-shaped orthogonal scanning is the best if compared with those under Z-shaped orthogonal scanning and single X-direction scanning.