316L/碳化钒复合材料SLM成形性能强化研究

Mechanical properties evolution of VC reinforced 316L stainless steel by selective laser melting

基于316L不锈钢粉末的选择性激光熔化(SLM)技术已经取得了较好的进展,对于成形件性能的改进多针对于SLM工艺参数的优化。为了进一步提升316L不锈钢成形件的机械性能,在原始316L不锈钢粉末中加入平均粒度为800 nm的碳化钒(VC)陶瓷颗粒,SLM成形后检测其机械性能。结果表明,添加了VC的316L/VC混合粉末成形后,VC固溶于基体中,成形件硬度提升约22.8%,屈服强度提升约33.8%,抗拉强度提升约45.3%,弹性模量提升约67.0%。由于孔隙率略有增加,伸长率降低约15.7%。

The selective laser melting(SLM)technology based on 316L stainless steel powder has made good progress.The parameters of the SLM process have always been optimized for mechanical properties.In order to further strengthen the mechanical properties of 316L stainless steel forming parts,vanadium carbide(VC)ceramic particles with an average particle size of 800 nm were added to the original 316L stainless steel powder and the mechanical properties were tested after SLM forming.The results show that vanadium carbide is dissolved in the matrix,the hardness of the molded parts is raised about 22.8%,the yield strength is raised about 33.8%,the tensile strength is raised about 45.3%,and the modulus of elasticity is raised about 67%.Due to a slight increase in porosity,the elongation is reduced about 15.7%.