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激光粉末床熔融（LPBF）打印参数对FeCoCrNiMn合金柱状晶向等轴晶转变的影响。

Effects of LPBF printing parameters on the columnar-to-equiaxed grain transition in FeCoCrNiMn alloys.

作者信息

Zhou Zhipeng, He Ketai, Liu Qi, Ming Guoxuan, Du Yangwei, Gan Yongyong, Dong Chaofang, Fan Bailin

机构信息

School of Mechanical Engineering, University of Science and Technology Beijing, Beijing, 100083, China.

AVIC Manufacturing Technology Institute Beijing, Beijing, 100027, China.

出版信息

Sci Rep. 2025 Jul 1;15(1):21893. doi: 10.1038/s41598-025-06638-x.

DOI:10.1038/s41598-025-06638-x
PMID:40595019
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12215271/
Abstract

In this research, laser powder bed fusion (LPBF) technology was utilized to fabricate FeCoCrNiMn high-entropy alloys (HEAs). An integrated approach combining simulation and experimental research was employed to investigate the influence of process parameters on the columnar-to-equiaxed transition (CET) within the molten pool during the LPBF process. Initially, a finite element model was developed to simulate the multi-layer LPBF printing process. This study delved into the effects of various printing parameters, namely laser power, scanning speed, and hatch spacing, on the solidification parameters. Experimental characterization was conducted to provide specific solidification model parameters, thereby validating the accuracy and reasonability of the simulation model. The research systematically and quantitatively constructed a solidification map, which correlates LPBF printing parameters with temperature gradient and solidification rate. This map unveiled a potential relationship between the LPBF solidification parameters and the microstructural morphology of the HEAs. Ultimately, mechanical property tests were performed, confirming that adjustments to the parameters could facilitate the CET to a certain extent, leading to an effective enhancement in the microhardness of the HEAs produced using LPBF technology. This study systematically investigated the LPBF printing of HEA, fine-tuned process parameters to control microstructure, and studied the effects on printed parts. This provides a valuable foundation for optimizing LPBF printing HEAs.

摘要

在本研究中，采用激光粉末床熔融（LPBF）技术制备FeCoCrNiMn高熵合金（HEA）。采用模拟与实验研究相结合的综合方法，研究工艺参数对LPBF过程中熔池内柱状晶向等轴晶转变（CET）的影响。首先，建立了有限元模型来模拟多层LPBF打印过程。本研究深入探讨了各种打印参数，即激光功率、扫描速度和扫描间距对凝固参数的影响。进行了实验表征以提供具体的凝固模型参数，从而验证模拟模型的准确性和合理性。该研究系统地、定量地构建了一个凝固图，将LPBF打印参数与温度梯度和凝固速率相关联。该图揭示了LPBF凝固参数与HEA微观结构形态之间的潜在关系。最终，进行了力学性能测试，证实调整参数可以在一定程度上促进CET，从而有效提高采用LPBF技术生产的HEA的显微硬度。本研究系统地研究了HEA的LPBF打印，微调工艺参数以控制微观结构，并研究了对打印部件的影响。这为优化LPBF打印HEA提供了有价值的基础。

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本文引用的文献

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Ultrasonics. 2023 Jul;132:106989. doi: 10.1016/j.ultras.2023.106989. Epub 2023 Mar 25.