|About this Abstract
|2020 TMS Annual Meeting & Exhibition
|Advanced High Strength Steels IV
|In-situ Quantitative Assessment of the Role of Silicon During the Quenching and Partitioning of a 0.2C Steel
|Pierre Huyghe, Sylvain Dépinoy, Cedric Georges, Matteo Caruso, Stephane Godet
|On-Site Speaker (Planned)
Silicon is an essential alloying element added in quenching & partitioning (Q&P) steels to delay carbide precipitation. However, there is a strong industrial interest to reduce the silicon content. This work investigates by in-situ High-Energy XRD (HEXRD) the effect of silicon on the microstructure evolution during quenching & partitioning of a commercial 0.2C-2.3Mn grade. This study highlights the role of the bainite transformation during the re-heating and partitioning steps. Silicon influences the kinetics of austenite decomposition into bainite and promotes the stabilization of austenite. This is explained by its ability to suppress carbide precipitation (i) at the interface between bainite and austenite and (ii) in the martensite matrix. Carbide precipitation at the bainite/austenite interface decreases the amount of carbon that diffuses from bainite to austenite, subsequently accelerating the bainite transformation kinetics and preventing austenite stabilization. Carbide precipitation in martensite reduces the amount of carbon available for partitioning in austenite.
|Planned: Supplemental Proceedings volume