Abstract：In order to study the distribution of alloy elements in austenite and ferrite during intercritical annealing of a Fe-C-Mn-Al transformation-induced plasticity (TRIP) steel, based on the analysis of thermodynamics and dynamics for austenization during intercritical annealing of the TRIP steel using thermal dilatometer, optical microscopy and electron microprobe measurements, an austenization model was established and solved by using the explicit finite volume method at two austenite temperatures of 800℃ and 840℃. The simulated results show that the initial stage of austenite transformation, which reaches paraequilibrium, is controlled by carbon diffusion in austenite. The austenization rate in this stage is fast, and the concentration difference of aluminum at the interface between the austenite and ferrite is significant, while the concentration difference of manganese is not significant. The late stage of austenite transformation is controlled by manganese diffusion in ferrite. The austenization rate in this stage is very slow,and the enrichment of aluminum in ferrite is significant,the concentration difference of manganese at the interface in the austenite and ferrite is obvious.
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2012, Vol. 47 
