Abstract
Using double-hit hot compression tests, the softening behavior of 304 H stainless steel was studied during unloading. The prestrains used were associated with the initiation of dynamic recrystallization (DRX) (ε c), the peak strain (ε p), 1/2 (ε c+ε p), the strain at maximum softening rate (ε i), and the onset of steady state flow (ε s). The following conditions of deformation were used: T=1000 °C, 1050 °C, and 1100 °C, \(\dot \varepsilon \)=0.01 and 0.1 s−1, and delay times of 0.3 to 1000 seconds. To define the above important strains, single-hit hot compression tests were performed over a wider range of deformation conditions than the double-hit ones—i.e., 900 °C to 1100 °C and \(\dot \varepsilon \)=0.01 to 1 s−1. The results show that a transition strain (ε*) separates the strain-dependent range of postdynamic softening from the strain-independent range. At strains between ε c and ε*, both metadynamic and static recrystallization contribute to interhit softening. The value of ε* obtained in this work was ε*=4/3 ε p. It was also found that the strain hardening rate was identical at all the critical strains (ε*) and took the value −22 MPa.
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Najafizadeh, A., Jonas, J.J., Stewart, G.R. et al. The strain dependence of postdynamic recrystallization in 304 H stainless steel. Metall Mater Trans A 37, 1899–1906 (2006). https://doi.org/10.1007/s11661-006-0132-9
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DOI: https://doi.org/10.1007/s11661-006-0132-9