The microstructure evolution during
deformation of
undercooled austenite in three low carbon
steels with much close contents of Si and C but different contents of Mn has been investigated by means of hot compression simulation experiment at 760 ℃ and strain rate of 1 s-1. The effects of the content of Mn on the deformed behavior of undercooled austentie, the kinetics characteristics of deformation enhanced
ferrite transformation and the ferrite grain size have been studied. It was found that the addition of Mn delays the transformation during deformation of undercooled austenite and higher true strain for the transformation is needed with increasing Mn content. Transformation kinetics can be divided into three stages, longer time and higher true strain are needed for each stages with increasing
Mn content in the steels. Deformation enhanced transformation induces forming ultra-fine equiaxed ferrite grains with sizes of 3.57±1.60,2.00±1.05 and 2.29±1.02μm in steels with 0.48, 0.84 and 1.29 Mn respectively, and homogeneously distributed minor second phases.
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