The Strain Dependence of Post-Deformation Softening during the Hot Deformation of ۳۰۴H Stainless Steel
سال انتشار: 1385
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 68
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شناسه ملی سند علمی:
JR_ISSIRAN-3-1_001
تاریخ نمایه سازی: 6 آبان 1402
چکیده مقاله:
Experiments were carried out in which the dependence of the fractional softening on temperature, time and strain rate was determined in a ۳۰۴H stainless steel. Three prestrain ranges were identified pertaining to three different post-deformation softening behaviors: ۱) prestraining to below the DRX critical strain: strongly strain dependent softening by SRX alone with softening kinetics controlled by growth rate of the nuclei; ۲) prestraining to above the DRX critical strain: SRX + MDRX softening with weaker strain dependence of the kinetics but still controlled by grain growth; ۳) 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= D۰/DDRX > ۴. 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 t۵۰ exhibits a minimum. These data differ somewhat from observations obtained in the torsion testing of solid bars, in which no strain dependence of t۵۰ was detected at e* and beyond. Whether or not the strain dependence of t۵۰ vanishes in the MDRX range is sensitive to the test method employed to study the post-deformation softening.
کلیدواژه ها:
نویسندگان
A. Najafizadeh
Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran
J. Jonas
Department of Metallurgical Engineering McGill University, Montréal, Canada
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