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Relation between intergranular stress of austenite and martensitic transformation in TRIP steels revealed by neutron diffraction

中性子回折により明らかにされたTRIP鋼におけるオーステナイトの粒間応力とマルテンサイト変態との関係

Harjo, S.; 川崎 卓郎; 土田 紀之*; 諸岡 聡; Gong, W.*

Harjo, S.; Kawasaki, Takuro; Tsuchida, Noriyuki*; Morooka, Satoshi; Gong, W.*

${it In situ}$ neutron diffraction measurements of two low-alloy steels and a 304-type stainless steel during tensile and creep tests were performed at room temperature. Changes in the diffraction pattern, the integrated peak intensities of austenite ($$gamma$$), and the peak positions of $$gamma$$ were analyzed and discussed to elucidate the relationship between intergranular stress in $$gamma$$ and the occurrence of martensitic transformation during deformation. Tensile loading experiments revealed that the susceptibility to martensitic transformation depended on the $$gamma$$-(hkl) grains, where $$gamma$$-(111) grains underwent martensitic transformation at the latest. The $$gamma$$-hkl dependence of the susceptibility to martensitic transformation was found to be controlled by the shear stress levels in $$gamma$$-(hkl) grains, which were affected by the intergranular stress partitioning during deformation.

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