日本金属学会誌
Online ISSN : 1880-6880
Print ISSN : 0021-4876
ISSN-L : 0021-4876
特集「巨大ひずみ加工で創出した超機能ナノ材料」
リューダース型変形を生じるFe-Ni-Al-C系合金冷間圧延材の機械的性質と変形挙動 -研究動向のまとめと最近の実験結果-
倉本 繁河野 悠太森 柚和小林 純也江村 聡澤口 孝宏
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2025 年 89 巻 1 号 p. 22-31

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It has been reported that severely cold worked Fe-24.6Ni-5.8Al-0.4C (mass%) had a yield strength of 2 GPa and a fracture elongation of 20 %, in which huge amount of Lüders-type deformation was observed. In the present article, we summarize the reports for high-strength Fe-Ni-Al-C, Fe-Mn, Fe-Cr-Ni and Fe-Ni-Mn base steels with the Lüders-type deformation so far, and provide our latest data on the effects of alloying elements and the cold-rolling reduction on the microstructure and mechanical properties of cold-rolled Fe-Ni-Al-C alloys. Previous reports imply that the phase stability of γ phase affects the size of Lüders elongation, while the strategies to control the microstructure to achieve high strength and high ductility are currently unknown. Our latest study also shows that the γ-phase stability affects the Lüders strain. In addition, it is confirmed that severe cold rolling by 80 % enables the prolonged Lüders strain as much as 25 % in nominal strain. This prolonged Lüders strain is achieved by multiple propagation of Lüders-type bands.

Mater. Trans. 64(2023) 1410-1418 に掲載.Table 1, Fig.6を修正.

Fig. 8 Stress-strain curves obtained by tensile tests for 5.0Al specimens. Fullsize Image
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