Exceptional creep resistance of additively manufactured 316L stainless steel via unprecedented early laves phase formation

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2025-02-06 DOI:10.1016/j.msea.2025.148006

Kwang-Hyeok Lim , Jong-Soo Bae , Shubham Chandra , KenHee Ryou , Pyuck-Pa Choi , Xipeng Tan , Gi-Dong Sim

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引用次数: 0

Abstract

Additively manufactured (AM) 316L stainless steel (SS) has garnered significant interest due to its superior strength with moderate ductility, making it a promising material for vessels and pipelines in nuclear reactors. Given the long-term pressurized thermal exposure inherent in the nuclear reactor environments, enhancing the creep resistance and investigating the creep mechanism of AM 316L SS are crucial. This study presents the exceptional creep resistance of 316L SS fabricated by electron beam powder bed fusion (EB-PBF) and elucidates the underlying creep deformation mechanisms. High-temperature creep tests were conducted on EB-PBF 316L SS at 600 °C and 650 °C, with performance benchmarked against 316L SS reported in the literature. Remarkably, the creep life of EB-PBF 316L SS was found to be 15.4 times greater than that of laser-based powder bed fusion 316L SS at 650 °C, 225 MPa, and 3.6 times higher than that of conventional wrought 316L SS at 650 °C, 250 MPa. The exceptional creep properties are primarily attributed to the early formation of the coherent C14 Laves phase along the grain boundaries, which retards the formation of creep cavities by preventing grain boundary sliding and delaying the accumulation of dislocations.

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来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.