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Orientation dependent tensile properties of a selective-laser-melt 316L stainless steel
Materials Science and Engineering: A ( IF 6.4 ) Pub Date : 2021-07-27 , DOI: 10.1016/j.msea.2021.141808
Mustafa Güden 1 , Hakan Yavaş 2 , Ahmet Alptuğ Tanrıkulu 2 , Alper Taşdemirci 1 , Barış Akın 3 , Samed Enser 1 , Ayberk Karakuş 1 , Burcu Arslan Hamat 2
Affiliation  

The effect of specimen inclination angle with respect to building direction on the tensile properties of a selective laser melt 316L alloy was investigated. Tensile test specimens were fabricated with the angles between 0° to 90° at 15° intervals using a rotation scanning. In addition, 316L alloy test specimens were generated in the ANSYS 2020R1 additive module and tensile tested in LS-DYNA in order to determine the effect of residual stresses on the tensile strengths. The microscopic analysis revealed a strong ⟨110⟩ fiber texture orientation along the building direction (the loading axis of 0° inclined specimens) and a weak <111> texture or nearly random distribution of directions in the normal to the building direction (tensile loading axis of 90° inclined specimens). The yield and tensile strength increased and ductility decreased with increasing inclination angle. The strength variation with the inclination angle was shown well-fitted with the Tsai-Hill failure criterion. Although, the used numerical models indicated an inclination-dependent residual stress, the difference in the residual stresses was much lower than the difference in the strengths between 0° and 90° inclined specimens. Predictions showed a lower twinning stress in 0° inclined specimens due to ⟨110⟩ fiber texture orientation in the tensile axis. The fiber texture resulted in extensive twinning; hence, higher ductility and tension-compression asymmetry in 0° inclined specimens. Based on these results, the variations in the strength and ductility of tested SLM-316L specimens with the inclination angle was ascribed to the variations in the angle between the fiber texture orientation and loading axis.



中文翻译:

选择性激光熔化 316L 不锈钢的取向相关拉伸性能

研究了试样相对于构建方向的倾斜角对选择性激光熔化 316L 合金拉伸性能的影响。使用旋转扫描以 0° 至 90° 的角度以 15° 的间隔制作拉伸试样。此外,在 ANSYS 2020R1 添加剂模块中生成 316L 合金试样并在 LS-DYNA 中进行拉伸测试,以确定残余应力对拉伸强度的影响。显微分析揭示了沿建筑方向(0°倾斜试样的加载轴)的强⟨110⟩纤维织构取向和弱的<111>织构或垂直于构筑方向(拉伸加载轴)的方向几乎随机分布90° 倾斜试样)。随着倾角的增加,屈服强度和抗拉强度增加,延展性降低。强度随倾角的变化与 Tsai-Hill 破坏准则非常吻合。尽管所使用的数值模型表明存在倾斜相关的残余应力,但残余应力的差异远低于 0° 和 90° 倾斜试样之间的强度差异。预测表明,由于 ⟨110⟩ 纤维在拉伸轴上的织构取向,0° 倾斜试样中的孪晶应力较低。纤维质地导致广泛的孪晶;因此,在 0° 倾斜试样中具有更高的延展性和拉压不对称性。基于这些结果,

更新日期:2021-07-28
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