ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
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Plastic Deformation Promoted by δ-Ferrite-to-Austenite Transformation in the Heat-Treated Cold-Rolled Novel Advanced High-Strength Steel in FeCrNiBSi Alloy System
Mohsen Askari-PaykaniHamid Reza ShahverdiReza Miresmaeili
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2017 Volume 57 Issue 6 Pages 1138-1140

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Abstract

In this work, the effects of heat treatment parameters were investigated in order to introduce a novel third-generation advanced high-strength steel (AHSS) in the FeCrNiBSi alloy system. For this purpose, hot rolling was carried out on rapidly solidified specimens at a 950–1100°C temperature range with a reduction of 60%, followed by 50% cold-rolling reduction. The heat treatment was carried out at a 700–1100°C temperature range for 20–120 minutes. The results showed that a novel third-generation AHSS was obtained by heat treatment at 1100°C for 120 minutes. The additional second-step heat treatment at 700°C for 20 minutes resulted in a better combination of mechanical properties, with a formability index of 39.6 GPa%. These mechanical properties were attributed to microbands formation and δ-ferrite-to-austenite transformation-induced plasticity mechanisms.

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© 2017 by The Iron and Steel Institute of Japan
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