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In situ diffraction characterization on microstructure evolution in austenitic stainless steel during cyclic plastic deformation and its relation to the mechanical response

繰り返し塑性変形中のオーステナイト系ステンレス鋼の微細構造変化に関するその場回折特性とその機械的応答との関係

熊谷 正芳*; 秋田 貢一*; 黒田 雅利*; Harjo, S.  

Kumagai, Masayoshi*; Akita, Koichi*; Kuroda, Masatoshi*; Harjo, S.

In situ neutron diffraction during 250 cycles of plastic deformation was performed and the diffraction line profile analysis was performed to qualitatively evaluate the change in the microstructure of austenitic stainless steel during the cyclic deformation. The dislocation density increased with increasing number of cycles until 50 cycles but thereafter decreased. The cycle number corresponding to this maximum point differed depending on whether it was evaluated as the total dislocation density or was deconvoluted into edge and screw dislocation densities. At the initial state, edge dislocations were predominant; however, screw dislocations greatly increased at the first stage of cyclic loading. Afterwards, edge dislocations formed cell walls and screw dislocations annihilated.

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分野:Nanoscience & Nanotechnology

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