Deformation Structure in Highly Irradiated Stainless Steels

作者: Hiromasa NISHIOKA , Koji FUKUYA , Katsuhiko FUJJI , Yuji KITSUNAI

DOI: 10.1080/18811248.2008.9711437

关键词: Stress corrosion crackingDislocationStrain rateComposite materialMetallurgyMaterials scienceGrain boundaryCrystal twinningDeformation (engineering)Stress–strain curveStress (mechanics)

摘要: Surface steps and deformation microstructure in cold-worked SUS316 stainless steels irradiated to 4 35 dpa (displacements per atom) were examined after being deformed by uniaxial tensile stress at 320°C a slow or fast strain rate. Dislocation channeling was the predominant mode of near surface Twinning dominant rate whereas twinning nanotwin formation occurred locally stressed area Deformation heterogeneity measured using spacing coarse induced dislocation channels increased with increasing dose from dpa. Grain boundary separation when pileups high normal on grain plane coexisted, which likely precursor intergranular cracking without any environmental factor.

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