The term " two-ductile-phase alloy " was used by the present authors to distinguish it from various kinds of other multiphase alloys as dispersion-hardened alloy, fiber-reinforced material, clad metal, etc.I~ In this review, the term so-called " dual phase steel " is used only for the ferrite-martensite (+retained austenite) steel sheets characterized by a low yield ratio and excellent formability.
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Tomota et al. (1982) studied this question.
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