|About this Abstract
||2010 TMS Annual Meeting & Exhibition
||Computational Thermodynamics and Kinetics
||Phase Field Modelling of Austenite Grain Growth in the Heat Affected Zone
||Morteza Toloui, Matthias Militzer
|On-Site Speaker (Planned)
Austenite grain growth in the heat affected zone (HAZ) of girth welds in a microalloyed linepipe steel is simulated using phase field modelling. The steep temperature gradient in the HAZ leads to thermal pinning that can adequately be replicated with the phase field approach. An effective grain boundary mobility has been determined from experimental grain growth studies during rapid continuous heating tests thereby accounting for pinning of TiN and NbCN as well as solute drag when Nb particles dissolve. Using the effective mobility austenite grain growth has been predicted in the HAZ employing typical time-temperature profiles and the resulting thermal gradients as a function of the position from the fusion line. Predicted grain structures have been compared with the grain structures observed in the HAZ.
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