Abstract
In this study, Gleeble 3800 thermal simulator was used to simulate the continuous annealing process of industrial production of dual phase steel with the tensile strength over 980 MPa. In the experiment, four different annealing temperatures of 700 °C, 720 °C, 740 °C and 760 °C were set in the intercritical region while keeping other process parameters unchanged. The experimental results showed that the martensite content increases with the rise of intercritical annealing temperature. However, this growth is not persistent, the obvious change of martensite content can be seen only when the temperature exceeds 20 °C in current study. In addition, with the increase of temperature, the elongated ferrite grains tend to become more equiaxed.
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