Micro-mechanical investigation for effects of helium on grain boundary fracture of austenitic stainless steel
作者： Terumitsu Miura , Katsuhiko Fujii , Koji Fukuya
DOI: 10.1016/J.JNUCMAT.2014.11.062
关键词: Irradiation 、 Ultimate tensile strength 、 Annealing (metallurgy) 、 Metallurgy 、 Focused ion beam 、 Materials science 、 Austenitic stainless steel 、 Brittleness 、 Grain boundary 、 Hardening (metallurgy)
摘要: Abstract Effects of helium (He) on grain boundary (GB) fracture austenitic stainless steel were investigated by micro-tensile tests. Micro-bicrystal tensile specimens fabricated for non-coincidence site lattice boundaries He ion-irradiated 316 focused ion beam (FIB) micro-processing. Micro-tensile tests conducted in a vacuum at room temperature the FIB system. Specimens containing more than 2 at.% fractured GBs. The criteria brittle occurrence GBs were: (1) concentrations higher 2 at.%; (2) formation bubbles with less 5 nm spacing; and (3) matrix hardening to 4.6 GPa (nano-indentation hardness). stress GB was lower specimen concentration while size areal density same. that contained 10 at.% had been annealed 923 K after irradiation nominally manner; however inter-bubble experienced ductile fracture. annealing caused grow but decreased so spacing widened hardness decreased, therefore mode changed from ductile. findings revealed promotes weakening strength due both matrix. In addition, suggested segregated atoms may have role
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