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Harjo, S. ; Mao, W.*; Kawasaki, Takuro ; Gong, W.

The effects of grain size on deformation-induced martensitic transformation (DIMT) and the deformation behavior of ultrafine-grained (UFG) metastable austenitic steels were investigated using in situ tensile tests with neutron diffraction on coarse-grained (CG, 35 m) and UFG (0.5 m) Fe-24Ni-0.3C steels. The results revealed that grain size has a significant impact on lattice strain partitioning among austenite grains during deformation. In the CG specimen, DIMT occurred in many austenite grains, leading to substantialstress relaxation. In contrast, the UFG specimen exhibited DIMT in fewer grains, resulting in reduced stress relaxation.

Language	:	Japanese
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Meeting title	:	日本材料学会第59回X線材料強度に関するシンポジウム
Held date	:	2025/07
Location (city)	:	名古屋
Location (country)	:	日本
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Keywords	:	Neutron Diffraction; In Situ; Tensile Deformation; TRIP Steel; Ultrafine Grain
Research Facility	:	J-PARC物質・生命科学実験施設
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Registration No. : BB20250766
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