The effect of preliminary deformation on the structure of heat treated steel 12Kh1MF

Conclusions

• 1. Intermediate heating of cold-rolled steel 12Kh1MF to 500°C leads to a polygonized structure resistant to recrystallization at normalizing temperatures. Under these conditions the decomposition of the austenite solid solution during normalization occurs preferentially by the bainitic mechanism with retention of the substructure developed in the ferritic grains. After PTMT one observes an increase of the time to failure by a factor of three as compared with SHT under the same testing conditions.

• 2. It was shown that the substructure is inherited after recrystallization in those cases where a polygonization substructure is formed, which is fixed by the dispersed precipitates.