2017-Sustainable Industrial Processing Summit
SIPS 2017 Volume 5. Marquis Intl. Symp. / New and Advanced Materials and Technologies
| Editors: | Kongoli F, Marquis F, Chikhradze N |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2017 |
| Pages: | 590 pages |
| ISBN: | 978-1-987820-69-0 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Development of Precipitation Hardened Austenitic High Mn Steels for Automotive Applications
Yunik Kwon1; Nack Kim1;1POSTECH, Pohang, Korea (Republic of [South] Korea);
Type of Paper: Regular
Id Paper: 109
Topic: 43
Abstract:
Recently, there has been a great interest in high strength steels that can improve the performance of automobiles by reducing the fuel consumption and the emission of exhaust gasses. Austenitic high Mn steels usually show high work hardening rate and accordingly excellent combination of ultimate tensile strength and ductility that are suitable for automotive applications. However, in spite of such excellent tensile properties, these austenitic high Mn steels usually show low yield strength as compared to other conventional ferritic high strength steels. Therefore, there is a great need for improving yield strength of austenitic high Mn steels without sacrificing other properties. In the present study, an attempt has been made to improve yield strength by utilizing precipitation hardening as well as grain refinement. Among the possible alloying elements that can induce the precipitation of carbides, V was chosen since it has a relatively large solubility in austenite at high temperatures. The model alloys containing various amounts of Mn, C, and V were fabricated and their microstructure and tensile properties were evaluated after annealing of cold rolled sheets. It shows that the cooling rate after annealing as well as alloy composition have a large effect on precipitation behavior of carbides and accordingly tensile properties. Details of microstructural evolution in these alloys have been investigated by EBSD, SEM, TEM, and 3DAP and correlated with tensile properties.