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Report No.

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

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

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 ($$gamma$$) and the peak positions of $$gamma$$ were analyzed and discussed to understand a relationship between intergranular stress in $$gamma$$ and the occurrence of martensitic transformation during deformation. From tensile loading, it was found that the susceptibility of martensitic transformation depended on $$gamma$$-($$textit{hkl}$$) grains, in which $$gamma$$-(111) grains underwent martensitic transformation at the latest. The $$gamma$$-($$textit{hkl}$$) dependence in the susceptibility of martensitic transformation was found to be controlled by the shear stress levels in $$gamma$$-($$textit{hkl}$$) grains, which were affected by the intergranular stress partitioning during deformation.



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