Title

GRAIN GROWTH KINETICS IN A SOLUTION-TREATED DUPLEX STAINLESS STEEL

GRAIN GROWTH KINETICS IN A SOLUTION-TREATED DUPLEX STAINLESS STEEL

Authorship

MAGNABOSCO, RODRIGO

MAGNABOSCO, RODRIGO

I am this author

DOI

10.5151/2594-5327-34832

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Abstract

THIS WORK EVALUATED THE GRAIN GROWTH KINETICS IN A UNS S31803 DUPLEX STAINLESS STEEL (DSS) DURING SOLUTION HEAT TREATMENT. DSS SHEET WAS COLD ROLLED TO A 50% THICKNESS REDUCTION, AND AFTER THAT, THREE SERIES OF SAMPLES WERE SUBJECTED TO SOLUTION TREATMENT AT 1050 °C, 1100 °C OR 1150 °C IN TIMES UP TO 96 H. BOTH GRAIN SIZE AND SURFACE AREAS BETWEEN PHASES (SV) WERE DETERMINED. MEAN INTERCEPT LENGTH MEASUREMENTS SHOWED DIFFERENCES BETWEEN FERRITE AND AUSTENITE IN RESPECT TO THE GRAIN GROWTH KINETICS AND GRAIN MORPHOLOGY, AND SV MEASUREMENTS HAVE SHOWN THAT THE SURFACE AREA DIMINISHES WITH THE INCREASE OF THE SOLUTION HEAT TREATMENT TEMPERATURE AND/OR DURATION. FERRITE IS THE PHASE THAT COMMANDS THE GLOBAL GRAIN GROWTH, SINCE FERRITE GRAIN GROWTH HAS THE HIGHEST ACTIVATION ENERGY (77.8 KJ/MOL) WHEN COMPARED TO THE ACTIVATION ENERGY FOR GRAIN GROWTH OF AUSTENITE (55.4 KJ/MOL).

THIS WORK EVALUATED THE GRAIN GROWTH KINETICS IN A UNS S31803 DUPLEX STAINLESS STEEL (DSS) DURING SOLUTION HEAT TREATMENT. DSS SHEET WAS COLD ROLLED TO A 50% THICKNESS REDUCTION, AND AFTER THAT, THREE SERIES OF SAMPLES WERE SUBJECTED TO SOLUTION TREATMENT AT 1050 °C, 1100 °C OR 1150 °C IN TIMES UP TO 96 H. BOTH GRAIN SIZE AND SURFACE AREAS BETWEEN PHASES (SV) WERE DETERMINED. MEAN INTERCEPT LENGTH MEASUREMENTS SHOWED DIFFERENCES BETWEEN FERRITE AND AUSTENITE IN RESPECT TO THE GRAIN GROWTH KINETICS AND GRAIN MORPHOLOGY, AND SV MEASUREMENTS HAVE SHOWN THAT THE SURFACE AREA DIMINISHES WITH THE INCREASE OF THE SOLUTION HEAT TREATMENT TEMPERATURE AND/OR DURATION. FERRITE IS THE PHASE THAT COMMANDS THE GLOBAL GRAIN GROWTH, SINCE FERRITE GRAIN GROWTH HAS THE HIGHEST ACTIVATION ENERGY (77.8 KJ/MOL) WHEN COMPARED TO THE ACTIVATION ENERGY FOR GRAIN GROWTH OF AUSTENITE (55.4 KJ/MOL).

Keywords

duplex stainless steels; grain growth kinetics; interphase area

duplex stainless steels; grain growth kinetics; interphase area