Initiation of Dynamic Recrystallization in Constant Strain Rate Hot Deformation

By E. Poliak, J. Jonas. 2003

443 citations recorded by the source corpus.

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 a or, equivalently, from inflections in In θ-In a and In θ-e 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.

Subfields: Materials Chemistry, Mechanical Engineering, Mechanics of Materials

View Paper: https://www.semanticscholar.org/paper/83c737be941a11397e5d8bf95b7baad527a62882

How researchers see this paper

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In Materials Chemistry

1. H. Mirzadeh
2. R. Kaibyshev
3. A. Belyakov
4. A. Najafizadeh
5. Taku Sakai
6. H. Miura
7. J. Jonas
8. J. Cabrera

In Mechanical Engineering

1. H. Mirzadeh
2. A. Najafizadeh
3. R. Kaibyshev
4. A. Belyakov
5. J. Jonas
6. Taku Sakai
7. H. Miura
8. J. Cabrera

In Mechanics of Materials

1. H. Mirzadeh
2. A. Najafizadeh
3. A. Belyakov
4. R. Kaibyshev
5. H. Miura
6. Taku Sakai
7. J. Jonas
8. J. Cabrera

Citations in the corpus

• Dynamic and post-dynamic recrystallization under hot, cold and severe plastic deformation conditions (2014, background): “tension, compression, plane strain tension or compression, and shear (torsion) [155,157].”
• Prediction of the critical conditions for initiation of dynamic recrystallization (2010, methodology): “52 have also been reported [10].”