Relation between Intergranular Stress in Austenite and Martensitic Transformation in TRIP Steels Revealed by Neutron Diffraction

Harjo Stefanus, Kawasaki Takuro, Tsuchida Noriyuki, Morooka Satoshi, Gong Wu

doi:10.2355/tetsutohagane.tetsu-2021-072

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中性子回折により検討したTRIP鋼におけるオーステナイトの粒応力とマルテンサイト変態の関係
チュウセイシカイセツニヨリケントウシタ TRIPコウニオケルオーステナイトノツブオウリョクトマルテンサイトヘンタイノカンケイ

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Abstract

<p>In situ neutron diffraction measurements of two low-alloy TRIP steels and a 304-type stainless steel during tensile and creep tests were performed at room temperature. Changes in the diffraction pattern, the peak integrated intensities of austenite (γ) and the peak positions of γ were analyzed and discussed to understand a relationship between intergranular stress in γ and the occurrence of martensitic transformation during deformation. From tensile loading, it was found that the susceptibility of martensitic transformation depended on γ-(hkl) grains, in which γ-(111) grains underwent martensitic transformation at the latest. The volume fractions of γ were found to decrease during applying load, but almost unchanged during holding the constant load in creep tests where the lattice strains of γ-(hkl) grains were mostly unchanged. The γ-hkl dependence in the susceptibility of martensitic transformation was found to be controlled by the shear stress levels in γ-(hkl) grains, which were affected by the intergranular stress partitioning during deformation.</p>

Journal

Tetsu-to-Hagane

Tetsu-to-Hagane 107 (10), 887-896, 2021

The Iron and Steel Institute of Japan

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