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Role of melt pool boundary condition in determining the mechanical properties of selective laser melting AlSilOMg alloy

机译：熔池边界条件在确定选择性激光熔化AlSilOMg合金的力学性能中的作用

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摘要

We describe here a comprehensive study on the effect of cellular structure and melt pool boundary (MPB) condition on the mechanical properties, deformation and failure behavior of AlSi10Mg alloy processed by selective laser melting (SLM). The morphology of melt pool (MP) on the load bearing face of tensile samples was significantly different with build directions. It resulted in different mechanical properties of the samples with different build directions. Furthermore, the microstructure analysis revealed that the MP in the SLM AlSi10Mg alloy mainly consisted of columnar alpha-Al grains which were made of ultra-fine elongated cellular structure. Electron back-scatter diffraction (EBSD) analysis revealed that the long axis of cellular structure and columnar grains were parallel to 100 , which resulted in 100 fiber texture in SLM AlSi10Mg alloy. However, Schmid factor calculation demonstrated that the anisotropy of mechanical properties of the SLM AlSi10Mg alloy built with different direction was mainly dependent on the distribution of MPB on the load bearing face, and not texture. The defects including pores, residual stress and heat affected zone (HAZ) located at MPB made it the weakest part in the SLM AlSi10Mg. The sample built along horizontal direction exhibited good combination of strength and plasticity and is attributed to the lowest fraction of MPBs that withstand load during tensile. MPB had strong influence on the mechanical properties and failure behavior of SLM AlSi10Mg built with different directions.
机译：我们在此描述对孔结构和熔池边界（MPB）条件对通过选择性激光熔融（SLM）处理的AlSi10Mg合金的力学性能，变形和破坏行为的影响的综合研究。拉伸样品的承载面上的熔池（MP）形态随构建方向而显着不同。这导致具有不同构建方向的样品具有不同的机械性能。此外，显微组织分析表明，SLM AlSi10Mg合金中的MP主要由圆柱状的Al-Al晶粒组成，这些晶粒由超细的细长胞孔结构制成。电子背散射衍射（EBSD）分析表明，SLM AlSi10Mg合金的孔结构和柱状晶粒的长轴与<100>平行，从而导致<100>纤维织构。然而，施密德因子计算表明，不同方向构建的SLM AlSi10Mg合金的力学性能各向异性主要取决于MPB在承载面上的分布，而不是织构。 MPB处的缺陷包括气孔，残余应力和热影响区（HAZ），使其成为SLM AlSi10Mg中最薄弱的部分。沿水平方向构建的样品表现出强度和可塑性的良好结合，并归因于在拉伸过程中承受载荷的MPB含量最低。 MPB对不同方向制造的SLM AlSi10Mg的力学性能和破坏行为有很大影响。

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