激光与光电子学进展, 2019, 56 (24): 241401, 网络出版: 2019-11-26
选区激光熔化碳化钒颗粒强化316L不锈钢的点阵结构及性能 下载: 890次
Structure and Properties of 316L Stainless Steel Lattice Reinforced via Selective Laser Melting Using Vanadium Carbide Particles
激光技术 选区激光熔化 工艺优化 点阵结构 性能强化机理 laser technique selective laser melting process optimization lattice structure performance strengthening mechanism
摘要
通过球磨混粉的方式在316L不锈钢3D打印专用粉体表面引入纳米V8C7颗粒,利用选区激光熔化(SLM)技术制备了V8C7/316L复合材料试样及点阵结构件。在优化的SLM工艺参数下获得的复合材料实体件的致密度高达99.4%;在激光熔化-凝固过程中,V8C7通过分解-析出机制生成的VCx增强相成为纳米级形核质点,其在细化奥氏体相晶粒的同时沿奥氏体晶界分布,可以阻止奥氏体晶粒在快速凝固过程中的长大;纳米尺度的VCx增强相及超细的近等轴晶金属基体均有助于大幅提升增材制造V8C7/316L结构的比强度。
Abstract
Herein, V8C7 nanoparticles were mixed with 316L stainless steel powder via ball-milling for selective laser melting (SLM)-assisted three-dimensional (3D) printing. Then, a lattice structural V8C7/316L composite was printed via SLM. Using optimized SLM process parameters, the density of composite solid parts as high as 99.4% was achieved. In addition, during the laser melting-solidification process, VCx reinforcements were generated via the decomposition-precipitation mechanism of V8C7 as the nanoscale nucleation sites. Consequently, the dispersed VCx nanoparticles were preferentially distributed along the austenite grain boundaries, thereby further inhibiting the grain-coarsening of austenite during rapid solidification. The nano-VCx reinforcements and the ultrafine metal-matrix grains that were nearly equiaxed, contributed to a significant increase in the specific strength of V8C7/316L lattice structures.
付旺琪, 钱波, 刘志远, 李博. 选区激光熔化碳化钒颗粒强化316L不锈钢的点阵结构及性能[J]. 激光与光电子学进展, 2019, 56(24): 241401. Wangqi Fu, Bo Qian, Zhiyuan Liu, Bo Li. Structure and Properties of 316L Stainless Steel Lattice Reinforced via Selective Laser Melting Using Vanadium Carbide Particles[J]. Laser & Optoelectronics Progress, 2019, 56(24): 241401.