增减材复合制造WC颗粒增强316L不锈钢材料组织性能

基于自主研发的增减材复合工艺技术与装备，探索了激光功率和WC颗粒质量分数对316L不锈钢复合材料致密度、组织演变和表面耐磨性能的影响规律.结果表明:随着WC质量分数的增加，试样致密度呈现先升高后降低的趋势，而硬度和耐磨性能均逐渐提高，过多的WC颗粒会使工件内部产生热裂纹，同时降低了工件的表面质量；当激光功率由270W提高到330W时粉末充分熔化，凝固后未熔合缺陷明显减少.当WC颗粒质量分数为5%、激光功率为330W时，增材件的致密度最高达到99.6%；相比未添加WC颗粒的工件，力学性能、耐磨性能和表面质量等指标均有明显提高.

Microstructure and Properties of WC Particles Reinforced 316 L Stainless Steel Composites Prepared by Additive and Subtractive Manufacturing

Using the own-patented technology and equipment for additive/subtractive manufacturing， the effects of laser power(270， 300 and 330W)and WC mass fraction(0， 2.5%， 5%， 10% and 15%)on the densification， microstructure evolution and surface wear resistance of the WC particles reinforced 316L stainless steel composites were investigated. The results show that with the increase of WC mass fraction， the density firstly increases and then decreases， while the hardness and wear resistance increase gradually. Excessive WC particles will cause thermal cracks and reduce the surface quality of the additive parts. When the laser power increases from 270W to 330W， the powders are fully melted， and the non-fusion defects obviously reduce after solidification. When the mass fraction of WC particles is 5% and the laser power is 330W， the density of the additive parts can reach up to 99.6%. The findings indicate that mechanical property， wear resistance and surface quality of the 316L matrix can be significantly improved by the WC reinforcements.