Evolution of cellular dislocation structures and defects in additively manufactured austenitic stainless steel under ion irradiation

Journal Article · 26 November 2019 · Scripta Materialia

DOI: https://doi.org/10.1016/j.scriptamat.2019.11.036 · OSTI ID:1578045

Li, Shilei  ^[1]; Hu, Jing ^[2]; Chen, Wei-Ying ^[2]; Yu, Jingyue ^[3]; Li, Meimei ^[2]; Wang, Yandong ^[3]

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1. Univ. of Science and Technology, Beijing (China); Argonne National Lab. (ANL), Argonne, IL (United States)
2. Argonne National Lab. (ANL), Argonne, IL (United States)
3. Univ. of Science and Technology, Beijing (China)

Here, the evolution of irradiation-induced defects in additively manufactured (AM) austenitic stainless steel was explored in situ by 1 MeV Kr ion irradiation at 450 and 600 °C in a transmission electron microscope. Cellular dislocation structure in AM steel act as sink/trap sites for the irradiation-induced defects, resulting in the lower density and smaller dislocation loops in AM steel than conventional forged (CF) steel at 450 °C. The higher stacking fault energy and local stress concentration induced by cellular dislocation structure in AM steel promotes the unfaulting process and the formation of network dislocation at 600 °C.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Office of Nuclear Energy (NE); National Natural Science Foundation of China (NNSFC); China Scholarship Council (CSC)
• Grant/Contract Number: AC02-06CH11357
• OSTI ID: 1578045
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: C Vol. 178; ISSN 1359-6462
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English