Abstract
Based on the theory of deformation-induced ferrite transformation (DIFT), effect of different controlled-rolling and controlled-cooling process on the microstructure and mechanical properties of the low alloy steel 2.25Cr1MoNb were investigated and the mechanism was discussed. Simulation experiments of hot deformation were carried out with the Gleeble-1500 system. Specimens were deformed compressively by single-pass and multi-pass hot rolling process with different deformation temperature, deformation reduction, and cooling rate. Results show that the ferrite grain size decreased and the ferrite volume fraction increased with decreasing deformation temperature. Higher deformation reduction resulted in finer ferrite grain size and higher ferrite volume fraction. When the cooling rate increased, ferrite grain size decreased but the ferrite volume fraction did not change much. The grain size and the ferrite volume fraction were improved more obviously by multi-pass than single-pass rolling. Results also showed that both the tensile strength and elongation of the steel were improved obviously when the grain size decreased. We may conclude that DIFT technique can improve the mechanical properties of the test material obviously.
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