Research on CCT Curves of Fe-C-Mn-Si-Cr-V Superbainite Steel
The continuous cooling dilation curves of two Fe-C-Mn-Si-Cr-V bainitic steels at different cooling rates were measured by Gleeble-1500 hot simulator. The transformation points were determined according to the inflection points of continuous cooling expansion curves. The microstructure of the samples at different cooling rates were observed on ZEISS optical microscope and the hardness of the samples was measured by hardness tester. Finally, the continuous cooling transformation curves(CCT) of two Fe-Mn-Si-Cr-V bainitic steels were plotted with origin. The results show that the bainite and martensite transformation points decrease with the increase of carbon content. The two Fe-Mn-Si-Cr-V bainitic steels proposed in this study have good hardenability.