Journal
METALS
Volume 12, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/met12122069
Keywords
third-generation advanced high-strength steel (AHSS); Al addition; microstructure; retained austenite; tensile property; cold formability
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Partial replacement of Si by Al improves the coatability of Si-Mn advanced high-strength steel sheets. It decreases the tensile ductility and stretch formability, but achieves the same excellent stretch-flangeability in high-strength steel sheets with a tensile strength above 1.2 GPa.
Partial replacement of Si by Al improves the coatability (or galvanizing property) of Si-Mn advanced high-strength steel (AHSS) sheets. In this paper, the effects of the partial replacement on the microstructure, tensile property, and cold formability are reported for the low-carbon third-generation AHSS sheets, which are classified into two groups, Group I and Group II. The partial replacement by 1.2 mass% Al increases the carbon concentration or mechanical stability of retained austenite and decreases its volume fraction in the AHSSs, compared to Al-free AHSSs. The partial replacement deteriorates the tensile ductility and stretch formability in the AHSSs with a tensile strength above 1.2 GPa. On the other hand, it achieves the same excellent stretch-flangeability as Al-free AHSSs. A complex addition of Al and Nb/Mo further enhances the stretch-flangeability. The cold formabilities are related to the heat treatment condition and microstructural and tensile properties, and the stress state.
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