Effect of hatch spacing on microstructure and properties of CoCrFeNiMo0.2 high entropy alloy by selective laser melting

被引：0

作者：

Li W. ^{[1
]}

Liu B. ^{[1
]}

Fu A. ^{[1
]}

Cao Y. ^{[1
]}

Liu H. ^{[2
]}

机构：

[1] State Key Laboratory of Powder Metallurgy, Central South University, Changsha

[2] Falcon Tech Co.Ltd., Wuxi

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2023年 / 54卷 / 01期

基金：

中国国家自然科学基金;

关键词：

CoCrFeNiMo[!sub]0.2[!/sub] high entropy alloys; hatch spacing; mechanical property; microstructure; selective laser melting;

D O I：

10.11817/j.issn.1672-7207.2023.01.003

中图分类号：

学科分类号：

摘要：

CoCrFeNiMo0.2 high entropy alloys were prepared by selective laser melting(SLM), and the effects of hatch spacing on microstructure and mechanical properties of the alloys were studied.The results show that the SLMed alloys exhibit multi-hierarchical structures, including melt pools, columnar grains and cellular structures.With the increase of hatch spacing, the relative density of the sample first increases and then decreases.When the hatch spacing is 0.15 mm, the relative density of the alloy is the highest, reaching 99.7%.As the hatch spacing increases, the size of cellular structure decreases and the texture weakens gradually.When the hatch spacing is 0.05 mm, the size of cellular structure is 0.99 μm, and the sample shows strong [001] texture along the building direction.As the hatch spacing increases to 0.20 mm, the size of cellular structure decreases to 0.36 μm, and the texture basically disappears.When the hatch distance is 0.15 mm, the comprehensive properties of the alloy are the best.The yield strength, tensile strength and fracture elongation can reach 696 MPa, 945 MPa and 31%, respectively, which is about 60% higher than that of the traditional cast CoCrFeNiMo0.2 high entropy alloy.The multi-hierarchical structures (especially nano cellular structure) composed of molten pools, columnar grains and cellular structures are the main reason for the excellent properties of SLM formed alloys. © 2023 Central South University of Technology.All rights reserved.

引用

页码：24 / 35

页数：11

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