|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advanced High-strength Steels
||Design of Carbide-free Bainite Steels by Cool and Partitioning (C&P)
||Kazuhiko Nishioka, Gregory B. Olson
|On-Site Speaker (Planned)
In recent years, carbide-free bainitic steels, consisting of fine bainitic ferrite and retained austenite, have achieved impressive combinations of strength and toughness. However, the problems of these bainitic steels have been the very long isothermal tempering time to obtain fine enough microstructures, and their high carbon content which lowers weldability. In this work, a new concept of cool and partitioning (C&P) bainitic steels is proposed and tested to overcome these problems. The proposed C&P process utilizes controlled gradual cooling in the tempering process, which reduces the total tempering time compared to the conventional quench and isothermal tempering process. The optimal design for the proposed C&P bainitic steels was analyzed by the ICME approach, where both thermodynamics and kinetics of carbide-free bainite formation were considered. The effects of alloying elements on the critical cooling rate were examined to lower the carbon content for improved weldability.
||Planned: Supplemental Proceedings volume