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首页> 外文会议>Annual Meeting Exhibition of The Minerals, Metals Materials Society >Microstructural Characteristics of Stainless Steel 316L Processed by Selective Laser Melting Technology
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Microstructural Characteristics of Stainless Steel 316L Processed by Selective Laser Melting Technology

机译：选择性激光熔化技术处理不锈钢316L的微观结构特性

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摘要

Among various additive manufacturing methods, selective laser melting (SLM) is a practical method for metal manufacturing due to its ability to make complex geometry and fabricate parts with superior mechanical properties. Utilization of high strength laser in SLM system forms a high temperature gradient which may alter microstructure of 3D printed metals due to rapid cooling during solidification process. The present study focuses on the microstructural evolution of AISI 316L stainless steel manufactured by SLM to better understand its characteristics and features for further improvement of this technology. Optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), and TEM with energy dispersive X-ray spectroscopy (EDX) have been carried out on 3D printed samples. The microstructural observation indicated very low porosity with homogeneous composition throughout the specimen. A layer by layer structure with columnar grains grown in the direction of heat transfer was clearly seen in the microstructure. A dense dislocation network with a single austenite phase crystallographic structure was identified as well from nanoscale observation of the samples.
机译：在各种添加剂制造方法中，选择性激光熔融（SLM）是一种实用的金属制造方法，因为它具有使复杂几何形状和制造具有优异机械性能的零件的能力。在SLM系统中利用高强度激光器形成高温梯度，这可能改变由于在凝固过程中快速冷却而改变3D印刷金属的微观结构。本研究侧重于SLM制造的AISI 316L不锈钢的微观结构演变，以更好地了解其特点和特征，以进一步改进该技术。光学显微镜（OM），扫描电子显微镜（SEM），X射线衍射（XRD），透射电子显微镜（TEM）和具有能量分散X射线光谱（EDX）的TEM已经在3D印刷样品上进行。微观结构观察表明在整个样本中具有均匀组合物的极低孔隙率。在微观结构中清楚地看到沿热传递方向生长的柱状晶粒层结构。鉴定了具有单一奥氏体相结晶结构的致密位错网络以及纳米级观察样品的观察。

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