|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||High Performance Steels
||Grain Growth and Precipitation Dissolution Modelling in the HAZ during Welding of Nb-Ti Steels
||Iņigo Iturrioz, Nerea Isasti, Jose Rodriguez-Ibabe, Pello Uranga, Nobuyuki Ishikawa, Daichi Izumi, Douglas Stalheim, David Jarreta, David Martin
|On-Site Speaker (Planned)
The production of modern high strength/high toughness linepipe steels is usually based on the hot rolling of low carbon Nb-Ti microalloyed steels. In this context, this study aims at developing a model able to predict austenite grain growth kinetics coupled to a precipitation dissolution model. This model was applied to the thermal paths in the heat affected zone (HAZ) during welding of pipes. Three titanium and niobium microalloyed steels with different initial precipitation states and microstructures resulting out of the hot rolling mill were selected. A numerical model based on the classical nucleation and growth theories was developed to predict the evolution of precipitates. This model will interact with a grain growth model based on Zener pinning and solute drag mechanisms. The resulting austenite grain growth kinetics are in good agreement with the laboratory data obtained for all the heat treatments.
||Iron and Steel, Phase Transformations, Modeling and Simulation