Deformation microstructures in a two-phase stainless steel during large strain deformation

Kaneaki Tsuzaki, Andrey Belyakov, Yuuji Kimura

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

1 被引用数 (Scopus)

抄録

Deformation microstractures were studied in a two-phase (about 60% ferrite and 40% austenite) Fe - 27%Cr - 9%Ni stainless steel. Severe plastic working was carried out by rolling from 21.3×21.3 mm2 to 7.8×7.8 mm2 square bar followed by swaging from Ø7.0 to 0.6 mm rod at an ambient temperature, providing a total strain of 6.9. After a rapid increase in the hardness at an early deformation, the rate of the strain hardening gradually decreased to almost zero at large strains above 4. In other words, the hardness approached a saturation level, leading to an apparent steady-state deformation behaviour during cold working. The severe deformation resulted in the evolution of highly elongated (sub)grains aligned along the rolling/swaging axis with the final transverse (sub)grain size of about 0.1 μm and the fraction of high-angle (sub)boundaries above 60%. However, the kinetics of microstructure evolution in the two phases was different. In the ferrite phase, the transverse size of deformation (sub)grains gradually decreased during the processing and approached 0.1 μm at strains of about 6.0, while the transverse size of the austenite (sub)grains rapidly reduced to its final value of 0.1 μm after a relatively low strain about 1.0.

本文言語英語
ホスト出版物のタイトルNanomaterials by Severe Plastic Deformation, NanoSPD3 - Proceedings of the 3rd International Conference on Nanomaterials by Severe Plastics Deformation
ページ305-310
ページ数6
出版ステータス出版済み - 12 1 2006
外部発表はい
イベント3rd International Conference on Nanomaterials by Severe Plastics Deformation, NanoSPD3 - Fukuoka, 日本
継続期間: 9 22 20059 26 2005

出版物シリーズ

名前Materials Science Forum
503-504
ISSN(印刷版)0255-5476

その他

その他3rd International Conference on Nanomaterials by Severe Plastics Deformation, NanoSPD3
国/地域日本
CityFukuoka
Period9/22/059/26/05

All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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