Effects of laser scanning speed and building direction on the microstructure and mechanical properties of selective laser melted Inconel 718 superalloy
Effects of laser scanning speed and building direction on the microstructure and mechanical properties of selective laser melted Inconel 718 superalloy
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DOI：
10.1016/j.mtcomm.2021.103095
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发表时间：
2021-12-28
影响因子：
3.8
通讯作者：
Ren, Zhongming
中科院分区：
文献类型：
--
作者：
Wang, Rui;Chen, Chaoyue;Ren, Zhongming
研究了不同扫描速度和构建方向对选择性激光熔化（SLM）制备的Inconel 718零件显微组织、力学性能和织构的影响。利用电子背散射（EBSD）和扫描电镜（SEM）研究了复合材料的微观组织演变，包括取向织构和析出相分布，并利用x射线衍射仪（XRD）分析了物相。结果表明：随着激光扫描速度的增加，单个熔池的宽深比增大，外延生长受到限制，导致< 001 >织构强度降低，力学性能的各向异性降低；扫描速度的增加引起的晶粒细化进一步削弱了力学性能的各向异性。该研究为激光扫描速度的提高提供了潜在的指导，有利于SLM制造中更均匀的微观结构和更高的生产率。
This work focused on the effects of different scanning speeds and building directions on the microstructure, mechanical properties, and texture of Inconel 718 parts manufactured by selective laser melting (SLM). The microstructure evolution, including orientation texture and precipitate distribution, was studied by electron backscatter (EBSD) and scanning electron microscope (SEM), and the phase was analyzed by X-ray diffractometer (XRD). The results show that with the increase of laser scanning speed, the width-to-depth ratio of single molten pool increases, and the epitaxial growth is restricted, which leads to a decrease in the intensity of the < 001 > texture and a decrease in the anisotropy of mechanical properties. The grain refinement caused by the increase in scanning speed further weakens the anisotropy of mechanical properties. This work can provide potential guidance of high laser scanning speed in benefiting a more homogenous microstructure and a higher production rate for SLM manufacturing.