Effect of MnSi2-Induced Solid Solution Strengthening on Mechanical Behavior of 316L Stainless Steel Fabricated by Selective Laser Melting,Steel Research International

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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 HV_0.2 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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