Initiation of Dynamic Recrystallization in Constant Strain Rate Hot Deformation

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概要

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• 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.

• 社団法人 日本鉄鋼協会の論文
• 2003-05-15

著者

• Jonas J.

  Dept. Of Matellurgical Engineering Mcgill University

• Poliak E.

  Research Laboratories Ispat Inland Inc.

関連論文

• EFFECT OF BORON AND CHROMIUM ADDITIONS ON THE WARM ROLLING BEHAVIOR OF LOW CARBON STEELS
• Prediction of Interpass Softening from the Strain Hardening Rate Prior to Unloading
• Critical Strain for Dynamic Recrystallization in Variable Strain Rate Hot Deformation
• Initiation of Dynamic Recrystallization in Constant Strain Rate Hot Deformation
• Effect of Chromium and Boron Additions on the Warm Rolling Behavior Of Low Carbon Steels

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