Journal
SCRIPTA MATERIALIA
Volume 162, Issue -, Pages 492-496Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2018.10.053
Keywords
Carbon partitioning; Retained austenite; Quenching and partitioning; TRIP; Medium-Mn
Categories
Funding
- National Natural Science Foundation of China [51722402, U1560204]
- Fundamental Research Funds for the Central Universities [N170705001]
- 111 Project [B16009]
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Bake-partitioning, a process integrating paint-baking of car-body assembling to induce carbon partitioning into austenite, has been proposed for enhancing the ductility of press-hardening steels. Carbon is estimated to diffuse a maximum distance of 2.7 nm in austenite at 170 degrees C for 20 min. Austenite films with a thickness of approximately 5 nm are therefore desired for sufficient bake-partitioning. This was realised by the ultra-fine prior austenite grain due to 7 wt% of manganese addition combined with vanadium carbide precipitation. The novel alloy exhibits 1800 MPa ultimate tensile strength combined with 16% elongation, which has never been achieved in press-hardening steels. (C) 2018 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.
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