TENSILE FLOW AND WORK-HARDENING BEHAVIOR OF A TI-MODIFIED AUSTENITIC STAINLESS-STEEL

The flow-stress data of a 15Cr-15Ni-2.2Mo-Ti modified austenitic stain less steel in the temperature range 300 to 1023 K was analyzed in term s of Ludwigson and Voce equations. The parameters of these equations w ere critically examined with respect to the effect of Ti/C ratio and t est temperature. It was found that the Ludwigson equation described th e flow behavior adequately up to the test temperature of 923 K, wherea s the Voce equation could be employed in the full temperature range. T he peaks/plateaus observed in the variation of these parameters as a f unction of temperature in the intermediate temperature range have been identified as one of the manifestations of dynamic strain aging (DSA) . Also, the variation of these parameters with temperature clearly cou ld bring out the different domains of DSA observed in this alloy. The work-hardening analysis of the flow-stress data revealed that in the D SA regime, the onset of stage III hardening is athermal.