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Title

THE STRAIN DEPENDENCE OF POST-DEFORMATION SOFTENING DURING THE HOT DEFORMATION OF 304H STAINLESS STEEL

Writers

NAJAFIZADEH A. | JONAS J.J.

Pages

 Start Page 1 | End Page 7

Abstract

 Experiments were carred out in which the dependence of the fractional softening temperature, time and strain rate was determined in a 304H STAINLESS STEEL. Three prestrain ranges identified pertaining to thtee different post-deformation softening behaviors: 1)prestraining to below the DRX ctitical strain: strongly strain. Dependent softening by SRX alone with softening kinetics controlled by grow threat of ihe nuclei 2) prestraining to above the DRX eritical 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 inhibitions 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 normlalized 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 depended of 150 was detected at e* and beyolld. Whether or not the 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.

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