|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Bainite Transformation in Medium Carbon Microalloyed Steel
||Sachin Kumar, Shiv Brat Singh
|On-Site Speaker (Planned)
In this work, phase transformation behaviour of plain medium carbon and medium carbon microalloyed steels was studied using dilatometer. Effect of prior deformation of austenite on the phase transformation behaviour and microstructure evolution was also investigated. Some thermo-mechanical cycles were designed to simulate actual forging conditions and executed in a deformation dilatometer to study the transformation behaviour and microstructure evolution. Microalloyed additions (Nb+Ti) result in ferritic-bainitic microstructures even at slow cooling rates (0.5-2<sup>o</sup>C/s). Prestrain accelerates the ferrite transformation as the transformation temperature increased approximately by 50<sup>o</sup>C. Deformation retards the bainite transformation and therefore, bainite volume fraction decreased and microstructure got refined. Some of the cooling cycles show two stages of transformation where second stage of transformation is believed to be for pearlite and bainite transformation in case of plain medium carbon and medium carbon microalloyed steels respectively. Details of the evolution of microstructure in all these cases will be discussed.
||Planned: Supplemental Proceedings volume