|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advanced High-strength Steels
||Numerical Investigations of the Effects of Subtitionnal Elements on the Interface Conditions during Partitioning in Q&P Steels
||Steve Gaudez, Sébastien Y.P. Allain, Julien Teixeira, Mohamed Gouné, Michel Soler, Frédéric Danoix
|On-Site Speaker (Planned)
In Q&P steels, carbon partitioning is considered to be driven by a carbon constraint equilibrium at martensite and austenite interfaces. It supposes an equal carbon chemical potential in both phases without diffusion of subtitutionnal species. We have investigated using Thermocalc the effect of these subtitutionnal elements (Mn, Si, Cr) on this particular interface conditions and established a practical relationship between the carbon concentrations at the interface in both phases as a function of alloy composition and temperature. It reveals that manganese concentration has a weak effect on austenite enrichment contrary to silicon for instance. The results obtained different thermodynamic databases are also critically discussed. Coupled with a 1D finite volume diffusion model as proposed originally by Santofimia et al., the interface conditions permits to estimate carbon distribution in austenite during partitioning and thus explain the anisotropy of X-Ray diffraction peaks reported in this steels.
||Planned: Supplemental Proceedings volume