Initiation of Dynamic Recrystallization in Constant Strain Rate Hot Deformation

• Poliak E. I.

  Research Laboratories, Ispat Inland Inc.

• Jonas J. J.

  Department of Metallurgical Engineering, McGill University

抄録

In constant strain rate tests, the occurrence of dynamic recrystallization (DRX) is traditionally identified from the presence of stress peaks in flow curves. However, not all materials display well-defined peaks when tested under these conditions. Using plain carbon, Nb-bearing and 321 austenitic stainless steels, it is shown that the onset of DRX can also be detected from inflections in plots of the strain hardening rate θ against stress σ or, equivalently, from inflections in ln θ-ln σ and ln θ-ε plots regardless the presence of stress peaks in the flow curves. These observations are verified by means of metallography. A unified description of the flow curve is introduced based on normalization of the stress and strain by the respective peak or steady state values. This approach reveals that, in a given material, the ratio of DRX critical stress to the peak or steady state stress is constant, as is that of the critical strain to the corresponding strain values. Furthermore, it is shown that the present technique can be used to establish the occurrence of DRX when this cannot be determined unambiguously from the shape of the flow curve.

収録刊行物

• ＩＳＩＪ　Ｉｎｔｅｒｎａｔｉｏｎａｌ

  ＩＳＩＪ　Ｉｎｔｅｒｎａｔｉｏｎａｌ 43 (5), 684-691, 2003

  一般社団法人 日本鉄鋼協会

キーワード

• hot deformation
• austenite
• dynamic recrystallization

詳細情報

• CRID: 1390282681428473600
• NII論文ID: 10014447757
• NII書誌ID: AA10680712
• DOI: 10.2355/isijinternational.43.684
• COI: 1:CAS:528:DC%2BD3sXjvFGms7o%3D
• ISSN: 13475460
• ISSN: 09151559
• ISSN: http://id.crossref.org/issn/09151559
• ISSN: http://id.crossref.org/issn/00211583
• Web Site: http://www.jstage.jst.go.jp/article/isijinternational1989/43/5/43_5_684/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可