Journal of Manufacturing Processes ( IF 6.2 ) Pub Date : 2021-05-29 , DOI: 10.1016/j.jmapro.2021.05.039 Xiaotian Yin , Qiang Zhai , Qingxia Zhang , Kunlun Wang , Lingtao Meng , Zhenghang Ma , Guoxia Chen , Shenghai Wang , Li Wang
Low surface hardness, low strength and poor corrosion resistance limit the further application of 316 L stainless steel (SS). Due to faster cooling rate and smaller pool, the properties of parts fabricated by selective laser melting (SLM) are often superior to traditional casting, powder metallurgy and directed energy deposition (DED) processes. In addition, due to its high hardness, strength and corrosion resistance, tungsten (W) was originally used for preparation of 316 L SS reinforced composites by SLM in this paper. Their mechanical and corrosion properties have been significantly enhanced. Different from ceramic particles of other compounds, some W particles can dissolve into the matrix well, so it can effectively inhibit the early crack caused by poor combination, thus protecting its elongation. In comparison with the pure 316 L SS samples, the yield strength (YS) of the 10 wt% W/316 L SS composites increased above 50% (from 627 MPa to 980 MPa). Interestingly, it still has an outstanding elongation rate of 19%, which is difficult for other types of reinforcing particles to achieve. At the same time, its hardness increased by 32% (from 222.7 HV to 294.3 HV). And 3 wt% W/316 L SS composites have better corrosion resistance and higher strength while maintaining original elongation. The improvement of mechanical properties is attributed to the addition of W particles, which led to grain refinement and grain boundary strengthening. The reasons for changes in corrosion resistance were also analyzed through the microstructure. Results of our study show that single element particles have application potential to metal matrix composites (MMCs) fabricated by SLM.
中文翻译:
钨颗粒对激光选区熔化316L不锈钢组织和性能的影响
低表面硬度、低强度和差的耐腐蚀性限制了316L不锈钢(SS)的进一步应用。由于更快的冷却速度和更小的熔池,选择性激光熔化 (SLM) 制造的零件的性能通常优于传统的铸造、粉末冶金和定向能量沉积 (DED) 工艺。此外,由于钨(W)具有较高的硬度、强度和耐腐蚀性,本文最初将其用于 SLM 制备 316 L SS 增强复合材料。它们的机械和腐蚀特性得到了显着增强。与其他化合物的陶瓷颗粒不同,部分钨颗粒能很好地溶解在基体中,因此能有效抑制结合不良引起的早期裂纹,从而保护其伸长率。与纯 316 L SS 样品相比,10 wt% W/316 L SS 复合材料的屈服强度 (YS) 增加了 50% 以上(从 627 MPa 到 980 MPa)。有趣的是,它仍然具有19%的突出伸长率,这是其他类型的增强颗粒难以达到的。同时,它的硬度提高了32%(从222.7 HV增加到294.3 HV)。而 3 wt% W/316 L SS 复合材料在保持原有伸长率的同时,具有更好的耐腐蚀性和更高的强度。机械性能的改善归因于W颗粒的加入,这导致晶粒细化和晶界强化。还通过微观结构分析了耐蚀性变化的原因。我们的研究结果表明,单元素颗粒在 SLM 制造的金属基复合材料 (MMC) 中具有应用潜力。