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Formation process and mechanical properties in selective laser melted multi-principal-element alloys
Journal of Materials Science & Technology ( IF 10.9 ) Pub Date : 2022-07-09 , DOI: 10.1016/j.jmst.2022.06.017
Jing Peng , Jia Li , Bin Liu , Jian Wang , Haotian Chen , Hui Feng , Xin Zeng , Heng Duan , Yuankui Cao , Junyang He , Peter K. Liaw , Qihong Fang

Additive manufacturing is believed to open up a new era in precise microfabrication, and the dynamic microstructure evolution during the process as well as the experiment-simulation correlated study is conducted on a prototype multi-principal-element alloys FeCrNi fabricated using selective laser melting (SLM). Experimental results reveal that columnar crystals grow across the cladding layers and the dense cellular structures develop in the filled crystal. At the micron scale, all constituent elements are evenly distributed, while at the near-atomic scale, Cr element is obviously segregated. Simulation results at the atomic scale illustrate that i) the solid-liquid interface during the grain growth changes from horizontal to arc due to the radial temperature gradient; ii) the precipitates, microscale voids, and stacking faults also form dynamically as a result of the thermal gradient, leading to the residual stress in the SLMed structure. In addition, we established a microstructure-based physical model based on atomic simulation, which indicates that strong interface strengthening exists in the tensile deformation. The present work provides an atomic-scale understanding of the microstructural evolution in the SLM process through the combination of experiment and simulation.



中文翻译:

选区激光熔化多主元素合金的形成过程及力学性能

增材制造被认为开启了精密微细加工的新时代,并且对使用选择性激光熔化 (SLM) 制造的原型多主元素合金 FeCrNi 进行了过程中的动态微观结构演变以及实验-模拟相关研究。 )。实验结果表明,柱状晶体在包层上生长,并且在填充晶体中形成致密的蜂窝结构。在微米尺度,所有组成元素分布均匀,而在近原子尺度,Cr元素明显偏析。原子尺度的模拟结果表明:i)晶粒生长过程中的固液界面由于径向温度梯度由水平变为弧形;ii) 沉淀物、微尺度空隙、由于热梯度,堆垛层错也会动态形成,从而导致 SLMed 结构中的残余应力。此外,我们基于原子模拟建立了基于微观结构的物理模型,表明拉伸变形中存在强界面强化。目前的工作通过实验和模拟的结合,提供了对 SLM 过程中微观结构演化的原子级理解。

更新日期:2022-07-14
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