Abstract
In dual-phase steels, partial austenization may result in different volume amount of austenite depending on intercritical annealing temperature between Ac1 and Ac3 temperatures. The annealing temperature is also responsible of chemical composition and grain size of austenite. This study deals with the effect of intercritical annealing temperature on Ms for dual-phase steels. In experimental studies using dilatometer, the specimens were first quenched to form martensite from austenitizing temperature of 1100°C. After martensitic transformation, specimens were annealed at different intercritical temperatures and finally gas quenched again. Ms were measured with using dilatometer curves and compared to calculated values using empirical formulas. Grain sizes of final microstructures were also quantitatively analyzed. It was seen that Ms depend on the intercritical annealing temperature. It is concluded that this double effect is attributed to intercritical annealing temperature which is responsible for chemical composition and grain size of austenite.
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