Application of Quenching and Partitioning (Q&P) Processing to Press Hardening Steel
SCIE
SCOPUS
- Title
- Application of Quenching and Partitioning (Q&P) Processing to Press Hardening Steel
- Authors
- Seo, EJ; Cho, L; De Cooman, BC
- Date Issued
- 2014-08
- Publisher
- SPRINGER
- Abstract
- Press hardening steel (PHS) has been increasingly used for the manufacture of structural automotive parts in recent years. One of the most critical characteristics of PHS is a low residual ductility related to a martensitic microstructure. The present work proposes the application of quenching and partitioning (Q&P) processing to improve the ductility of PHS. Q&P processing was applied to a Si- and Cr-added Q&P-compatible PHS, leading to a press hardened microstructure consisting of a tempered martensite matrix containing carbide-free bainite and retained austenite. The simultaneous addition of Si and Cr was used to increase the retained austenite fraction in the Q&P-compatible PHS. The Q&P processing of the PHS resulted in a high volume fraction of C-enriched retained austenite, and excellent mechanical properties. After a quench at 543 K (270 A degrees C) and a partition treatment at 673 K (400 A degrees C), the PHS microstructure contained a high volume fraction of retained austenite and a total elongation (TE) of 17 pct was achieved. The yield strength (YS) and the tensile strength were 1098 and 1320 MPa, respectively. The considerable improvement of the ductility of the Q&P-compatible PHS should lead to an improved in-service ductility beneficial to the passive safety of vehicle passengers.
- Keywords
- COMPOSITION PROPERTY APPROACH; MARTENSITE-TRANSFORMATION; RETAINED AUSTENITE; SILICON STEELS; CARBON STEELS; TRIP STEELS; BAINITE; MICROSTRUCTURE; TEMPERATURE; CHROMIUM
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/11629
- DOI
- 10.1007/S11661-014-2316-Z
- ISSN
- 1073-5623
- Article Type
- Article
- Citation
- METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, vol. 45A, no. 9, page. 4022 - 4037, 2014-08
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