| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 7980330 | Materials Science and Engineering: A | 2014 | 17 Pages |
Abstract
The transformation behavior, mechanical properties and stretch-flangeability of an ultra-high-strength TRIP-assisted bainitic-ferritic sheet steel 0.2C-2Si-1.8Mn were investigated at different austempering temperatures for automotive applications. Increasing the austempering temperature was found to partially transform the uniform fine lath structure matrix and film-type metastable retained austenite into blocky martensite or austenite. The investigated steel exhibits good stretch-formability, particularly when austempered at temperatures lower than or slightly higher than the Ms point, accompanied by an excellent combination of strength and ductility. The good stretch-flangeability is related to a certain number of film-type metastable retained austenite structures. Blocky martensites, which blocky austenite transforms into during the cooling process or subsequent tensile test, deteriorate the stretch-flangeability.
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Authors
Z.Z. Zhao, H.X. Yin, A.M. Zhao, Z.Q. Gong, J.G. He, T.T. Tong, H.J. Hu,