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It has been reported that severely cold worked Fe-24.6Ni-5.8Al-0.4C (wt.%) 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 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 gamma 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 gamma-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.

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• In Copyright
  

Keyword: ultrahigh strength, high ductility, severe cold rolling, phase stability, Lüders band

Date published: 2025-01-01

Publisher: Japan Institute of Metals

Journal:

• Journal of the Japan Institute of Metals and Materials (ISSN: 00214876) vol. 89 issue. 1 p. 22-31 JD202410

Funding:

• 公益財団法人 池谷科学技術振興財団 (塑性加工による高強度高延性Fe-Ni-Al-C系合金の特性制御（倉本繁）)

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.2320/jinstmet.jd202410

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Updated at: 2025-03-04 12:30:09 +0900

Published on MDR: 2025-03-04 12:30:10 +0900