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High-throughput experimentation for microstructural design in additively manufactured 316L stainless steel

机译：橡皮布三维不锈钢显微结构设计的高通量试验

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摘要

In the present study, a combination of high-throughput (HT) and low-throughput (LT) techniques was used to rapidly determine the processing window and generate processing maps for Selective Laser Melting (SLM) of 316L stainless steel. The HT method includes the fabrication of hundreds of hex nut-shaped specimens, each processed with a unique combination of laser power, scanning speed, and hatch spacing. An easily removable scaffolding permitted rapid sample extraction from the base plate, thus saving machining cost and time. Hardness and immersion density measurements were used for HT characterization to identify a processing window for maximum strength and density. Within the defined processing window, a low-throughput (LT) microstructural interrogation of specimens were performed. The microstructural analysis included quantification at various length scales (i.e., grains size and morphology, texture, primary dendrite arm spacing, and melt pool geometry analysis). Microstructure-based processing maps as a function of volumetric energy density were generated. The combination of HT and LT methods produced a predictive relationship between hardness and primary dendrite arm spacing using a Hall-Petch relationship. A model is proposed to explain the dependence of microstructure on the melt pool geometry. The HT method can be applied for the microstructural design of SLM-fabricated components in other alloys.
机译：在本研究中，使用高通量（HT）和低通量（LT）技术的组合来快速确定处理窗口并产生316L不锈钢的选择性激光熔化（SLM）的处理映射。 HT方法包括百分之百六角螺母形样品的制造，每个样品用激光功率，扫描速度和舱口间距的独特组合处理。易于可拆卸的脚手架允许从底板中的快速样品提取，从而节省加工成本和时间。硬度和浸入密度测量用于HT表征以识别用于最大强度和密度的处理窗口。在定义的处理窗口内，执行样品的低通量（LT）微观结构询问。微结构分析包括各种长度尺度的定量（即，晶粒尺寸和形态，纹理，初级树突臂间距以及熔融池几何分析）。产生基于微结构的处理地图作为体积能密度的函数。 HT和LT方法的组合在使用霍尔辅助关系中产生了硬度和初级枝形臂间距之间的预测关系。建议模型解释微观结构对熔池几何形状的依赖性。 HT方法可以应用于其他合金中的SLM制造成分的微观结构设计。

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