Determination of Microscopic Strain Distribution in the Martensitic Transformation of Fe-31Ni Alloy Plates Using the Micro-grid Marker Method

Tatsuya Morikawa; Akinobu Shibata; Naoto Nakamura; Masaki Tanaka; Kenji Higashida

doi:10.2355/isijinternational.isijint-2023-163

論文 Determination of Microscopic Strain Distribution in the Martensitic Transformation of Fe-31Ni Alloy Plates Using the Micro-grid Marker Method

Tatsuya Morikawa ; Akinobu Shibata (National Institute for Materials Science) ; Naoto Nakamura ; Masaki Tanaka ; Kenji Higashida

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Tatsuya Morikawa, Akinobu Shibata, Naoto Nakamura, Masaki Tanaka, Kenji Higashida. Determination of Microscopic Strain Distribution in the Martensitic Transformation of Fe-31Ni Alloy Plates Using the Micro-grid Marker Method. ISIJ International. 2024, 64 (2), ISIJINT-2023-163. https://doi.org/10.2355/isijinternational.isijint-2023-163

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(abstract)

The strain distribution due to martensitic transformation in a Fe–Ni alloy was investigated using high-precision
markers drawn via electron-beam lithography. This study focused on the strain distribution within the lenticular martensite plate, which developed immediately below the martensite start temperature. The strain in the central region of lenticular martensite was determined to be greater than that near the interface boundary by measuring the displacement at each intersection of the grid markers. This finding is consistent with the shape strain distribution predicted by the phenomenological theory of martensitic transformation based on the microstructure observations.

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