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Volume 13
Issue 3
10.3390/met13030630
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Article

Effect of Annealing and Hot Isostatic Pressing on the Structure and Hydrogen Embrittlement Resistance of Powder-Bed Fusion-Printed CoCrFeNiMn High-Entropy Alloys

by
Shulu Feng
1,2,
Zhijiu Ai
1,*,
Jiayi He
2,
Bangjian Yang
3,
Guoqing Gou
3 and
Lei Han
2
1
College of Mechanical and Electrical Engineering, Southwest Petroleum University, Chengdu 610500, China
2
Petro China Southwest Pipeline Company, Chengdu 610094, China
3
Key Laboratory of Advanced Materials Technology Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China
*
Author to whom correspondence should be addressed.
Metals 2023, 13(3), 630; https://doi.org/10.3390/met13030630
Submission received: 7 January 2023 / Revised: 13 March 2023 / Accepted: 15 March 2023 / Published: 22 March 2023
(This article belongs to the Special Issue Progress in Laser Additive Manufacturing on Metal Material)
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Abstract

As an additive-manufacturing (AM) technique, powder-bed fusion (PBF) shows tremendous potential in both the research and industrial communities. Research on the post-treatment of PBF-prepared products is a hot topic. Hydrogen embrittlement (HE) resistance is a practical necessity, especially in microstructures. Here, the effect of annealing and hot isostatic pressing (HIP) on the properties of PBF technology-printed CoCrFeNiMn high-entropy alloys (HEAs) is investigated. The results show that these two post-thermal treatment approaches can release residual stress (from approximately 338 to 44 MPa) from PBF-printed samples, which is the main reason for declines in hardness (from approximately 211 to 194 HV). In addition, both annealing and HIP can reduce HE sensitivity, thus improving resistance to HE, with elongation increasing by 75.4% and 85.4% after annealing and HIP, respectively. In summary, both post-thermal treatments are of great significance to the development of HEAs with optimized structures and protection against HE, which can contribute to the development of these behaviors during application.
Keywords: powder-bed fusion; high-entropy alloy; post-thermal treatments; residual stress; hydrogen embrittlement resistance powder-bed fusion; high-entropy alloy; post-thermal treatments; residual stress; hydrogen embrittlement resistance

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MDPI and ACS Style

Feng, S.; Ai, Z.; He, J.; Yang, B.; Gou, G.; Han, L. Effect of Annealing and Hot Isostatic Pressing on the Structure and Hydrogen Embrittlement Resistance of Powder-Bed Fusion-Printed CoCrFeNiMn High-Entropy Alloys. Metals 2023, 13, 630. https://doi.org/10.3390/met13030630

AMA Style

Feng S, Ai Z, He J, Yang B, Gou G, Han L. Effect of Annealing and Hot Isostatic Pressing on the Structure and Hydrogen Embrittlement Resistance of Powder-Bed Fusion-Printed CoCrFeNiMn High-Entropy Alloys. Metals. 2023; 13(3):630. https://doi.org/10.3390/met13030630

Chicago/Turabian Style

Feng, Shulu, Zhijiu Ai, Jiayi He, Bangjian Yang, Guoqing Gou, and Lei Han. 2023. "Effect of Annealing and Hot Isostatic Pressing on the Structure and Hydrogen Embrittlement Resistance of Powder-Bed Fusion-Printed CoCrFeNiMn High-Entropy Alloys" Metals 13, no. 3: 630. https://doi.org/10.3390/met13030630

APA Style

Feng, S., Ai, Z., He, J., Yang, B., Gou, G., & Han, L. (2023). Effect of Annealing and Hot Isostatic Pressing on the Structure and Hydrogen Embrittlement Resistance of Powder-Bed Fusion-Printed CoCrFeNiMn High-Entropy Alloys. Metals, 13(3), 630. https://doi.org/10.3390/met13030630

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