Effect of Interlayer Cooling on Microstructure and Microhardness of FeCoNiCrAl High-Entropy Alloy Fabricated by Laser Additive Manufacturing

IF 2 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Engineering and Performance Pub Date : 2025-02-04 DOI:10.1007/s11665-025-10678-9

Zengrong Hu, Mingrui Chen, Zhikang Wu, Shuncun Luo, Xiaonan Wang, Jiale Xu, Hai Zhang

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Abstract

The FeCoNiCrAl high-entropy alloys prepared by laser additive manufacturing are promising for a wide range of applications. In this study, samples of FeCoNiCrAl high-entropy alloy fabricated by laser additive manufacturing under different process conditions were investigated. In this study, two kinds of laser additive methods without interlayer cooling and interlayer cooling were used, respectively, and the experimental results were compared, and the microstructure and composition were analyzed. The results show that both samples are mainly composed of disordered BCC solid solution and ordered B2 cubic structure. The microstructure of both samples changed from columnar to equiaxed grains due to the different thermal gradients and solidification rates at the top and bottom of each layer. The equiaxed grain size of the sample with interlayer cooling was smaller than that of the sample without interlayer cooling due to the difference in undercooling, which caused the microhardness of the sample with interlayer cooling to be larger than that of the sample without interlayer cooling.

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层间冷却对激光增材制造FeCoNiCrAl高熵合金显微组织和显微硬度的影响

采用激光增材制造技术制备的FeCoNiCrAl高熵合金具有广泛的应用前景。研究了激光增材制造技术在不同工艺条件下制备的FeCoNiCrAl高熵合金样品。本研究分别采用无层间冷却和层间冷却两种激光添加方式，对实验结果进行比较，并对微观组织和成分进行分析。结果表明：两种样品主要由无序BCC固溶体和有序B2立方结构组成。由于上下两层的热梯度和凝固速率不同，两种试样的显微组织都由柱状晶转变为等轴晶。由于过冷度的差异，层间冷却样品的等轴晶粒尺寸小于未层间冷却样品，导致层间冷却样品的显微硬度大于未层间冷却样品的显微硬度。

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来源期刊

Journal of Materials Engineering and Performance 工程技术-材料科学：综合

CiteScore

3.90

自引率

13.00%

发文量

1120

审稿时长

4.9 months

期刊介绍： ASM International''s Journal of Materials Engineering and Performance focuses on solving day-to-day engineering challenges, particularly those involving components for larger systems. The journal presents a clear understanding of relationships between materials selection, processing, applications and performance. The Journal of Materials Engineering covers all aspects of materials selection, design, processing, characterization and evaluation, including how to improve materials properties through processes and process control of casting, forming, heat treating, surface modification and coating, and fabrication. Testing and characterization (including mechanical and physical tests, NDE, metallography, failure analysis, corrosion resistance, chemical analysis, surface characterization, and microanalysis of surfaces, features and fractures), and industrial performance measurement are also covered