【作者】 潘琰峰； 沈以赴； 顾冬冬； 胥橙庭；

【Author】 Pan Yanfeng Shen Yifu Gu Dongdong Xu Chengting (Nanjing University of Aeronautics and Astronautics, Nanjing, 210016)

【机构】 南京航空航天大学材料科学与技术学院；

【摘要】 采用直接金属激光烧结的方法,对316不锈钢粉末进行了一系列烧结实验。实验发现,在液相黏度较高、表面张力大,熔体材料不浸润固相颗粒和基板等因素的影响下,烧结过程中出现了球化现象。球化的出现妨碍了直接金属激光烧结成形的顺利进行。本文分析了316不锈钢粉末球化效应产生的原因,讨论了工艺参数(激光功率、扫描速度、粉层厚度)对316不锈钢金属粉末烧结成形的影响。研究表明,适当提高扫描速度或减小激光功率可以在一定程度上减小316不锈钢粉末选择性激光烧结的球化效应。更多还原

【Abstract】 A series of experiments were carried out with Direct Metal Laser Sintering ( DMLS) for the 316 stainless steel powders. During the laser sintering, due to the large liquid phase viscosity and surface tension, the balling effect was occurred when the molten did not wet the solid metal particle and the underlying substrate. This resulted in a rough and bead-shaped surface, obstructing a smooth layer deposition. The balling effect of 316 stainless steel powder was studied, and the effects of process parameters , such as laser power, scan rate, and layer thickness, on, the success of laser sintering were discussed. The results show that increasing scan rate and decreasing laser power can minish balling effect to a certain extent.更多还原