A Finite Element Approach For The Partitioning Of Carbon In Q&P Steel

Over the latest years,automobile industries have been increasingly employing the hot-stamped parts for use in vehicles to dealt with crash worthiness and reduce the consumption of fuel.Hot Stamping Q-P steel(HS-QP)are the most promising materials to achieve this objective,their thorough chemical compositions and multiphase microstructures enhance the performance of vehicles.Base on this finding,the development of HS-QP steel plates involves understanding their properties and manufacturing technologies.These manufacture processes include the well-known heat treatment,called Quenching and Partitioning(Q&P),which en-hance the strength without undermining the ductility of the component.The steels treated by this process achieved a final microstructure consisting of martensitic matrix with carbon-enriched retained austenite.Presently,researchers has focused on forecasting the most suitable parameters which yield cost-effective Q&P steels.In the current study,a Galerkin finite element analysis of the carbon partitioning from martensite into austenite during quenching and partitioning(Q&P)processing is considered.In contrast to classical or sophisticated diffusion field models,an alternative non-linear gov-erning equation based on chemical potential and composition is approached.The model is applied to simulate the carbon migration of 1-step and 2-step Q&P assuming an immobile austenite-martensite phase boundary and,in turn,compared with experimental magnetization measurements of the volume fraction of retained austenite(RA)from 0.8-Si 22MnB5 sample.Simulations show outstanding results about the influence of Si and C content in the prediction of RA after the final quench.