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Effect of MnSi2-Induced Solid Solution Strengthening on Mechanical Behavior of 316L Stainless Steel Fabricated by Selective Laser Melting
Steel Research International ( IF 1.9 ) Pub Date : 2021-04-09 , DOI: 10.1002/srin.202100069
Meng Li 1 , Meiping Wu 1 , Peipei Lu 1, 2 , Xin Liu 1 , Yiyao Wang 1 , Xiaojin Miao 1
Affiliation  

As an emerging additive manufacturing technology, selective laser melting (SLM) can manufacture metal matrix composites with high performance. Herein, a MnSi2 compound is innovatively utilized to improve the mechanical properties of the 316L substrate. The results indicate that an appropriate mass fraction of the MnSi2 compound can promote the solid solution, leading to an increment in the surface quality, microhardness, and tensile strength of the 316L substrate. When the addition of MnSi2 is 6.0 wt%, the sample exhibits the highest microhardness and tensile strength with the value of 426 HV0.2 and 860 MPa, respectively. However, microcracks are observed and the ultimate tensile displacement is decreased synchronously; meanwhile, its fracture behavior exhibits mixed-mode ductile fracture and brittle fracture. Overall, this study explains a novel hypothetical mechanism of solid solution reinforcement by adding a MnSi2 compound into 316L.

中文翻译:

MnSi2诱导固溶强化对激光选区熔化法制备316L不锈钢力学性能的影响

作为一种新兴的增材制造技术,选择性激光熔化(SLM)可以制造高性能的金属基复合材料。在此,创新性地利用MnSi 2化合物来改善316L基板的机械性能。结果表明,适当质量分数的MnSi 2化合物可以促进固溶,从而提高316L基体的表面质量、显微硬度和抗拉强度。当MnSi 2的添加量为6.0 wt%时,样品的显微硬度和抗拉强度最高,值为426 HV 0.2和 860 兆帕,分别。然而,观察到微裂纹和极限拉伸位移同步减小;同时,其断裂行为表现出混合模式的韧性断裂和脆性断裂。总的来说,这项研究通过在 316L 中添加 MnSi 2化合物来解释固溶体增强的新假设机制。
更新日期:2021-04-09
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