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

• Published in: Scripta materialia Vol. 178; no. C; pp. 245 - 250
• Main Authors: Li, Shilei, Hu, Jing, Chen, Wei-Ying, Yu, Jingyue, Li, Meimei, Wang, Yandong
• Format: Journal Article
• Language: English
• Published: United States Elsevier Ltd 15.03.2020; Elsevier
• Subjects: Additive manufacturing; Austenitic stainless steel; Cellular dislocation structure; Ion irradiation; Irradiation-induced defect; MATERIALS SCIENCE; Austenitic stainless steel; Ion irradiation; Irradiation-induced defect; Additive manufacturing; Cellular dislocation structure
• ISSN: 1359-6462; 1872-8456
• DOI: 10.1016/j.scriptamat.2019.11.036

The evolution of irradiation-induced defects in additively manufactured (AM) austenitic stainless steel was investigated 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. [Display omitted]