@article { author = {Najafizadeh, A. and Jonas, J.}, title = {The Strain Dependence of Post-Deformation Softening during the Hot Deformation of 304H Stainless Steel}, journal = {International Journal of Iron & Steel Society of Iran}, volume = {3}, number = {1}, pages = {1-7}, year = {2006}, publisher = {Iron & Steel Society of Iran}, issn = {2981-0388}, eissn = {2981-0396}, doi = {}, abstract = {Experiments were carried out in which the dependence of the fractional softening on temperature, time and strain rate was determined in a 304H stainless steel. Three prestrain ranges were identified pertaining to three different post-deformation softening behaviors: 1) prestraining to below the DRX critical strain: strongly strain dependent softening by SRX alone with softening kinetics controlled by growth rate of the nuclei; 2) prestraining to above the DRX critical strain: SRX + MDRX softening with weaker strain dependence of the kinetics but still controlled by grain growth; 3) at a prestrain of e* and beyond: nucleation-controlled MDRX softening with the full inhibition of SRX. The transition prestrain e* can exceed the peak strain if the DRX grain refinement  ratio g= D0/DDRX > 4. The transition to MDRX-dominated softening can be attributed to a constant value of the normalized strain hardening rate independent of the preloading temperature and strain rate. The softening data from the compression tests show that at e*, the time for half softening t50 exhibits a minimum. These data differ somewhat from observations obtained in the torsion testing of solid bars, in which no strain dependence of t50 was detected at e* and beyond. Whether or not the strain dependence of t50 vanishes in the MDRX range is sensitive to the test method employed to study the post-deformation softening.}, keywords = {Hot deformation,304H stainless steel,Metadynamic Recrystallization,Softening kinetics}, title_fa = {The Strain Dependence of Post-Deformation Softening during the Hot Deformation of 304H Stainless Steel}, abstract_fa = {}, keywords_fa = {}, url = {https://journal.issiran.com/article_4805.html}, eprint = {https://journal.issiran.com/article_4805_e5f2956c08d0c9accb3bb1c240e1e263.pdf} }