The effect of processing parameters on dislocation density and tensile properties in laser powder bed fusion 316L

M Schreiber, C Brice, K Findley, J Klemm-Toole, J Gockel
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Abstract

The processing-structure-properties relationships in laser beam powder bed fusion (PBF-LB) additive manufacturing (AM) are complex with multiple aspects of the processing impacting the microstructure and mechanical properties. Though, the influences of process parameters on strengthening mechanisms are less clear. In this work, laser power, scanning velocity, and hatch spacing were varied to promote PBF-LB 316L microstructures with distinctive thermal histories to vary microstructures and tensile properties. Tensile data were collected for over 100 different processing parameters on a single PBF-LB platform. Across the process parameter matrix yield strength, work hardening behavior, and ductility varied considerably. In this work, the effect of process parameters on initial dislocation density was studied. By quantifying the dislocation density with X-ray diffraction and line profile analysis, a relationship between processing parameters and initial dislocation densities was established. The contribution of dislocation density and other strengthening mechanisms to the yield strength is discussed.
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加工参数对激光粉末床熔融 316L 中位错密度和拉伸性能的影响
激光束粉末床熔融(PBF-LB)增材制造(AM)中的加工-结构-性能关系非常复杂,加工的多个方面都会对微观结构和机械性能产生影响。不过,工艺参数对强化机制的影响还不太清楚。在这项工作中,通过改变激光功率、扫描速度和舱口间距来促进具有独特热历史的 PBF-LB 316L 微结构,从而改变微结构和拉伸性能。在单个 PBF-LB 平台上收集了 100 多个不同加工参数的拉伸数据。不同工艺参数下的基体屈服强度、加工硬化行为和延展性差异很大。在这项工作中,研究了工艺参数对初始位错密度的影响。通过 X 射线衍射和线剖面分析对差排密度进行量化,建立了加工参数与初始差排密度之间的关系。讨论了位错密度和其他强化机制对屈服强度的贡献。
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