Fracture behavior transition by change of strain rate in dislocation-induced Si steels

Takashi Mizuguchi, Rintaro Ueji, Hayato Miyagawa, Yasuhiro Tanaka, Kazunari Shinagawa

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

2 被引用数 (Scopus)

抄録

The fracture behavior transition due to the change of strain rate in 5%Si magnetic steel with dislocation microstructures was studied. The Si steel was multi-passed rolled at 800°C to a various reductions up to 50%. The room temperature tensile deformation was conducted at various strain rates from 10-5/s to 100/s. All rolled steels were fractured in ductile manners with local elongation (necking) at slower strain rate. When strain rate was faster, the local elongation disappeared and the fracture manner was turned to brittle. The strain rate at which fracture mechanism changed from ductile to brittle increased with the increasing of the reduction. On the other hand, the almost fully recrystallized Si steel was fractured in the brittle manner at any strain rate and the transition strain rate was not found. The fractured tensile specimen with no local elongations contains deformation twins; whereas these deformation twins were not observed in the fractured specimen with local elongations. This result indicates that dislocation structure evolved during rolling suppressed the twinning and that the dislocation structure is effective for the enhancement of toughness in Si steel.

本文言語英語
ホスト出版物のタイトルTHERMEC 2011
出版社Trans Tech Publications Ltd
ページ2187-2192
ページ数6
ISBN(印刷版)9783037853030
DOI
出版ステータス出版済み - 2012
外部発表はい
イベント7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011 - Quebec City, QC, カナダ
継続期間: 8 1 20118 5 2011

出版物シリーズ

名前Materials Science Forum
706-709
ISSN(印刷版)0255-5476
ISSN(電子版)1662-9752

その他

その他7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011
Countryカナダ
CityQuebec City, QC
Period8/1/118/5/11

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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