A medium manganese steel designed for water quenching and partitioning |
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Authors: | Z R Hou X M Zhao W Zhang H L Liu |
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Affiliation: | 1. State Key Laboratory of Rolling &2. Automation, Northeastern University, Shenyang, People’s Republic of China;3. Planning Body Shop, FAW-VOLKSWAGEN Automotive Co., Ltd., Changchun, People’s Republic of China;4. Product Research Institute, Benxi Steel Plates Co., Ltd., Benxi, People’s Republic of China |
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Abstract: | An aluminium-containing medium manganese steel has been designed to undergo intercritical annealing followed by quenching in water and subsequent partitioning. Water quenching, replacing the quenching temperature (QT) between 150 and 300°C in conventional quenching and partitioning steels, is therefore adopted in QP alloys, in order to guarantee the precise QT in practice. The low intercritical annealing temperature of 750°C refines both ferrite and prior austenite grains into submicron size. The large fraction of ultra-fine ferrite, as well as the transformation-induced plasticity effect of retained austenite, improves the overall ductility of this water-quenched and partitioned steel. The alloy has achieved excellent mechanical properties of 1130?MPa ultimate tensile strength combined with 19.2% total elongation. |
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Keywords: | Retained austenite TRIP effect dual-phase steel ultra-fine grain AHSS |
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