采用激光选区熔化技术成形了不同粒径的S136模具钢, 研究了粉末粒径对成形件相组成、组织、磨损性能和抗腐蚀性能的影响。结果表明, 粉末平均粒径为22.8 μm的成形件基本无孔隙, 摩擦系数和磨损率较小, 耐腐蚀性能最佳, 腐蚀失重为31.51×10-4 g·mm-2。粉末平均粒径过小时成形件易产生裂纹, 而过大时易产生孔隙。

The S136 mould steels with different particle sizes are fabricated by the selective laser melting (SLM) technique and the effects of particle size on phase compositions, microstructures, wear and corrosion resistance performances are studied. The results show that the forming parts with an average particle size of 22.8 μm have nearly no micro-pores, and their friction coefficient and wear rate are relatively small, but the corrosion resistance performance is the best and the corrosion weight-loss is 31.51×10-4 g·mm-2. If the average particle size is too small, there occur more cracks in the forming parts, however there occur more micro-pores when the average particle size is too large.