2024 - Sustainable Industrial Processing Summit
SIPS 2024 Volume 7. Lipkowski Intl. Symp / Physical Chemistry
| Editors: | F. Kongoli, J. Atwood, L. Barbour, G. Duca, R. Kuroda, A. Legocki, M. Zaworotko |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2024 |
| Pages: | 171 pages |
| ISBN: | 978-1-998384-16-7 (CD) |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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EFFECT OF AUSTENITIZING CONDITION ON THE CARBIDE DISSOLUTION AND MARTENSITIC TRANSFORMATION TEMPERATURE IN A STAINLESS STEEL AISI 420A (SUS420J2)
Tibério Graco Duarte1;1FEDERAL UNIVERSITY OF OURO PRETO, Ouro Preto, Brazil;
Type of Paper: Regular
Id Paper: 438
Topic: 53
Abstract:
The AISI 420A (SUS420J2) stainless steel is commonly subjected to quenching and tempering heat treatments when intended for various high-value applications. However, the proper selection of the austenitizing temperature, a step preceding the fast cooling in quenching, remains challenging. Numerous reports in the literature, as well as in industry, make it clear that slight alterations in this parameter strongly modify the mechanical properties of tempered products, even when using the same cooling rate. In this context, the present study aimed to evaluate the effect of the austenitizing temperature on the carbide dissolution and the martensitic transformation in this steel. For this purpose, resources such as computer thermodynamic simulation and dilatometry were used concomitantly with structural characterization techniques. It was concluded that with the increase in temperature in association with the continuous carbide dissolution, there was a significant austenite enrichment in C and Cr, which strongly contributed to the decrease in martensitic transformation critical temperatures. In this scenario, the increase in austenitizing temperature led to a significant hardening of the martensitic microstructure, reaching up to a 59% increase in Vickers hardness with a 275°C increase in this heat treatment parameter.