Transactions of the Iron and Steel Institute of Japan
Online ISSN : 1881-1183
Print ISSN : 0021-1583
Process Factors for Cold-rolled Dual-phase Sheet Steels
Takashi FURUKAWAHirofumi MORIKAWAMichio ENDOHiroshi TAKECHIKazuo KOYAMAOsamu AKISUETeruaki YAMADA
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JOURNAL OPEN ACCESS

1981 Volume 21 Issue 11 Pages 812-819

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Abstract
Dual-phase structure formation in the intercritical annealing method is strongly affected by the cooling stage. Role of the cooling stage consists of
1) carbon enrichment into the untransformed austenite,
2) avoidance of pearlite formation, and
3) martensite and retained austenite formation.
Significance of a two-stage cooling can be explained on the above basis.
Employment of a rapid heating and a short-time intercritical holding produces a dual-phase steel having both a high bake-hardening and a high work-hardening characteristics. This phenomenon is supposedly related to a transient state of solute carbon partitioning in the intercritical temperature range.
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