An attempt has been made to understand the kinetics concerning the manufacturing schedule of high strength 304 stainless steel comprising formation of strain-induced a 0 martensite in the course of cold rolling (25%) at 0 C and its reversion during annealing in the temperature range of 300-800 C for 1 h. Increase in reversion with increasing annealing temperature without any perceptible grain growth up to 800 C has been demonstrated by the microstructural investigation. X-ray diffraction analysis has revealed that the 25% cold rolling has resulted in the formation of 20% deformation induced martensite which after annealing at 800 C has been reduced to 8%. Different stages of reversion behaviour have been envisaged by carrying out differential scanning calorimetry. Activation energies of the reactions involved during reversion have been determined by Kissinger method. Results are compared and found to be in good agreement with the published data.
The present study investigates the evolution of microstructure and mechanical properties of 304 stainless steel after thermo‐mechanical controlled processing (TMCP). Three different FRTs (finish rolling temperatures) have been adopted and the micro‐constituents are identified as austenite grains, stacking faults, annealing, and deformation twins. Fine austenite grains in the range of 1–30 μm are obtained at lower FRT (700 °C) whereas at higher FRT, coarse grains are formed. TEM and X‐ray analyses indicate the formation of M23C6 ((Cr, Fe)23C6) precipitates for higher FRT (900 °C). Specimen processed with 700 °C FRT results into 37% enhancement in UTS compared to the base metal which is attributed to fine partially recrystallized grain, extensive deformation twinning and high dislocation density. Maximum elongation (68%) is obtained due to the formation of strain‐free equiaxed grains (≈40 μm) at 900 °C FRT.
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