Predicting the Critical Stress for Initiation of Dynamic Recrystallization
By A. Najafizadeh, J. Jonas. 2006
207 citations recorded by the source corpus.
The critical stress for initiation of dynamic recrystallization (DRX) can be identified from the inflection point on the strain hardening rate (qds/de) versus flow stress (s) curve. This kind of curve can be described by an equation that fits the experimental q-s data from zero to the peak stress. Such a curve must have an in- flection point and the simplest relation that has such properties is a third order equation. Hot compression tests were carried out on a 304 H stainless steel over the temperature range 900-1 100°C and strain rate range 0.01-1 s � 1 to a strain of 1. An appropriate third order equation was fitted to the strain hardening data. The results show that the critical stress at initiation s c�� B/3A where A and B are coefficients of the third order equation. It is evident that this value depends on the deformation condi- tions. The stress-strain curve was then normalized with respect to the peak stress, leading to a normalized value of the critical stress (uc) equal to ucs c/s p�� B� /3A� . Here Aand Bare coefficients of the normal- ized third order equation. This value is constant and independent of the deformation conditions.
Subfields: Materials Chemistry, Mechanical Engineering, Mechanics of Materials
View Paper: https://www.semanticscholar.org/paper/f24183d52ca706c5a2031a18e117e0b3684d86a9
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In Materials Chemistry
In Mechanical Engineering
In Mechanics of Materials
Citations in the corpus
- Prediction of the critical conditions for initiation of dynamic recrystallization (2010, methodology): “Nearly similar value for normalized critical stress has been reported for austenitic stainless steels [16].”