Effect of cooling temperature field on formation of shelf-like bainite in high carbon silicon steel

The effect of temperature gradient field on microstructure of Fe-0.88C-1.36Si-1.01Cr-0.43Mn (wt%) is investigated. The distribution of bainite is related to cooling temperature gradient field. The oriented bainitic ferrite with subunit structure is formed due to the high transformation driving force formed by large cooling temperature gradient, which displays large hardness.