| 研究課題/領域番号 |
22K14509
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| 研究種目 |
若手研究
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| 配分区分 | 基金 |
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| 審査区分 |
小区分26050:材料加工および組織制御関連
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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, 准教授 (00782038)
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| 研究期間 (年度) |
2022-04-01 – 2025-03-31
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| 研究課題ステータス |
交付 (2023年度)
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| 配分額 *注記 |
4,550千円 (直接経費: 3,500千円、間接経費: 1,050千円)
2024年度: 1,430千円 (直接経費: 1,100千円、間接経費: 330千円)
2023年度: 1,300千円 (直接経費: 1,000千円、間接経費: 300千円)
2022年度: 1,820千円 (直接経費: 1,400千円、間接経費: 420千円)
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| キーワード | deformation behavior / ultrafine grain / steel / martensite / martensitic |
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| 研究開始時の研究の概要 |
When the grain size of a commercial 304 type stainless steel is reduced to less than 1 or 2 micronmeter, it exhibits a stable necking that can propagate through the gauge portion of the sample during tensile deformation. It is a unique deformation behavior that has never been observed in metallic materials while often observed in polymer materials. This research aims at investigating the mechanism of such interesting “Polymer-like” deformation localization behavior in high strength ultra-fine grained (UFG) austenitic stainless steels.
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| 研究実績の概要 |
Research activities and achievements in academic year 2023 are as follows:
(1)Publication in Scripta Materialia: The research results on characterizing the polymer-like deformation behavior of the 304 stainless steel were published, which clarified the transformation speed and internal stress of the deformation induced martensite during the huge Luders band deformation of the ultra-fine grained 304 stainless steel.
(2)Keynote talk at JIM 2024 Spring Meeting: This talk introduced stress analysis methods using diffraction techniques for better understanding the deformation behavior associated with the transformation induced plasticity phenomenon in austenitic steels.
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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 originally planned experiments of tensile deformationat at different temperatures with in-situ irradiation and in-situ digital image correlation (DIC) measurements on the ultra-fine grained (UFG) 304 type stainless steel were successfully performed through collaborating with BL19-TAKUMI in Japan Proton Accelerator Research Complex (J-PARC). The temperature effect on the fraction and internal stress of the deformation-induced martensite phase during the Lueders deformation were successfully measured, which helped with quantitative interpretation on the "Polymer-like" deformation of the material.
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| 今後の研究の推進方策 |
In the next step, the experiment data of tensile deformation with neutron diffraction measurement performed at different temperatures on the ultra-fine grained 304 stainless steel will be analyzed for establishing the constitutive equations describing the effect of deformation induced martensitic transformation on the stress-strain relation.
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