On the microstructure and tensile properties of Inconel 718 alloy fabricated by selective laser melting and conventional casting
On the microstructure and tensile properties of Inconel 718 alloy fabricated by selective laser melting and conventional casting
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选区激光熔化与常规铸造Inconel 718合金的显微组织和拉伸性能
DOI：
10.1142/s2424913021410034
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发表时间：
2021-10
影响因子：
--
通讯作者：
Shuai Wang
中科院分区：
文献类型：
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作者：
Minglin He;Yong Ni;Shuai Wang
本文采用多尺度分析方法研究了Inconel718合金经选择性激光熔凝(SLM)和常规铸造工艺处理后的组织和拉伸性能。结果表明，印前Inconel718合金的主要特征是含有亚微米级胞状结构单元的柱状晶组织。在晶界存在高密度位错缠结、Nb/Mo原子偏析和纳米Laves相。同时，我们还观察到胞状结构内部的位错堆积和层错。相反，在铸态Inconel718合金中，晶粒和Laves相都要粗大得多。在颗粒中局部观察到离散位错、位错缠结和[公式：见正文]“析出物。拉伸结果表明，与铸态合金相比，印刷后的Inconel718合金具有更高的强度和更低的延伸率。根据实验结果，对胞状结构的形成机理进行了探讨。
In this work, we investigated the microstructure and tensile properties of Inconel 718 alloy processed by selective laser melting (SLM) and conventional casting technique using multiscale characterization methods. Results indicated that a columnar grain structure containing cellular structure units with submicron size was the major feature in the as-printed Inconel 718 alloy. At the cellular structure boundaries, the high-density dislocation tangles, segregation of Nb/Mo atoms and nano-sized Laves phases were found. Meanwhile, we also observed dislocation pile-ups and stacking faults in the interior of the cellular structure. In contrast, in the as-cast Inconel 718 alloy, both the grains and Laves phases were much coarser. Discrete dislocations, dislocation tangles and [Formula: see text]” precipitates were locally observed in the grains. Tensile results showed the as-printed Inconel 718 alloy had a higher strength and a lower elongation in comparison with those in the as-cast alloy. Based on the experimental results, the formation mechanism of the cellular structure was discussed.