| 研究課題/領域番号 |
22K14509
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| 研究機関 | 京都大学 |
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研究代表者 |
高 斯 京都大学, 工学研究科, 講師 (00782038)
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| 研究期間 (年度) |
2022-04-01 – 2025-03-31
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| キーワード | deformation behavior / ultrafine grain / steel / martensitic |
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| 研究実績の概要 |
Research activities and research achievements in the academic year 2022 are as follows:
(1)Tensile deformation with in-situ neutron diffraction experiments were performed on the UFG 304 stainless steel at BL19-TAKUMI, JPARC, Japan. The transformation rate of deformation induced martensite and the phase stress partitioning between austenite matrix and martensite during the propagation of the huge Luders band were quantitatively evaluated by the neutron diffraction technique.
(2)Above results were summarized into a short paper submitted to the journal Scripta Materialia and now it is under review.
(3)An oral presentation was given in the international conference “The 7th International Conference on Advanced Steels (ICAS)” held on May 29 - June 1, 2022 Tsukuba, Japan.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
The research is progressing more smoothly even than initially planned. That is because the literature survey, the preparation of the material and the experiments have been successfully performed without frustrations. In addition, the newly developed experimental equipment in BL19-TAKUMI, JPARC enabled a hybrid in-situ neutron diffraction and digital image correlation technique measurements on the deformation of the UFG stainless steel, which greatly accelerated the progressing of the research.
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| 今後の研究の推進方策 |
It has been revealed by the research results so far that the deformation induced martensitic transformation played a key role in the polymer-like deformation behavior of the UFG 304 stainless steel. Nevertheless, it is still unclear how different transformation rate of deformation induced martensitic transformation and different stress partitioning behaviors between austenite and martensite impact the huge Luders deformation (polymer-like deformation behavior) of the material. To this end, it is planned to systematically study the temperature dependence of the deformation behaviors of the UFG 304 stainless steel using in-situ neutron diffraction combined with digital image correlation in the forthcoming academic year 2023.
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| 次年度使用額が生じた理由 |
It was initially planned to order an alloy material (Fe-Ni-C alloy) from a company for the current research subject. However, procedures for ordering that material from the company and the fabrication of the material unexpectedly take 5~6 months, and it was impossible to place the order within the fisical year 2022. Therefore, ordering that alloy material was re-scheduled to the next fisical year (2023).
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