Based on multiphase field conception and integrated with the idea of vector-valued phase field,a phase field model for typical allotropic transformation of solid solution is proposed.The model takes the non-uniform di...Based on multiphase field conception and integrated with the idea of vector-valued phase field,a phase field model for typical allotropic transformation of solid solution is proposed.The model takes the non-uniform distribution of grain boundaries of parent phase and crystal orientation into account in proper way,as being illustrated by the simulation of austenite to ferrite transformation in low carbon steel.It is found that the misorientation dependent grain boundary mobility shows strong influence on the formation of ferrite morphology comparing with the weak effect exerted by misorientation dependent grain boundary energy.The evolution of various types of grain boundaries are quantitatively characterized in terms of its respective grain boundary energy dissipation.The simulated ferrite fraction agrees well with the expectation from phase diagram,which verifies this model.展开更多
基金The work was supported by the fund of the State Key Laboratory of Solidification Processing in NWPU(Grant No.SKLSP201725).
文摘Based on multiphase field conception and integrated with the idea of vector-valued phase field,a phase field model for typical allotropic transformation of solid solution is proposed.The model takes the non-uniform distribution of grain boundaries of parent phase and crystal orientation into account in proper way,as being illustrated by the simulation of austenite to ferrite transformation in low carbon steel.It is found that the misorientation dependent grain boundary mobility shows strong influence on the formation of ferrite morphology comparing with the weak effect exerted by misorientation dependent grain boundary energy.The evolution of various types of grain boundaries are quantitatively characterized in terms of its respective grain boundary energy dissipation.The simulated ferrite fraction agrees well with the expectation from phase diagram,which verifies this model.
