Abstract
Isothermal transformation is the key stage to carbide precipitation in microalloyed steel. Detailed phase transformation data are needed in order to control and study the precipitation process of carbides accurately. However, alloying elements will change the transformation process in this microalloyed low carbon steel. Therefore, the effects of titanium and molybdenum elements on isothermal transformation behaviour were studied by a Gleeble 3800 thermal-mechanical simulator. Microscopic test and dilatometry were applied to analyse the isothermal transformation of steels. The results show that the ferrite in steel changes from polygonal ferrite to quasi-polygonal ferrite to acicular ferrite with the decrease of temperature from 700°C to 550°C, and the addition of titanium and molybdenum elements retards the isothermal transformation and result in prolonged transformation time. Besides, alloying elements also tend to inhibit the phase transformation in specific temperatures and lead to more untransformed austenite.
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