ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Microstructure Control of Dual-Phase Steels through Hot-Dip Al–Mg–Si Alloy Coating Process
Naoki TakataTadashi TsukaharaSatoru KobayashiMasao Takeyama
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2016 Volume 56 Issue 2 Pages 319-325

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Abstract

This study investigates the γα transformation kinetics of Fe–Mn–C dual-phase steels at a temperature above the melting point of an Al–8.2Mg–4.8Si (wt.%) alloy coating formed on their surface by hot-dipping process. Using an experimentally determined time-temperature-transformation (TTT) diagram for a model steel of Fe–1.5Mn–0.1C (wt.%), the volume fraction of martensite is controlled through the intercritical heat treatment incorporated into the hot-dipping process. The microstructural observations confirm that this combined process route makes it possible to fabricate hot-dipped Al alloy-coated dual-phase steels with a controlled microstructure.

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© 2016 by The Iron and Steel Institute of Japan
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