Detection and Analysis of CCT Curve of Low-carbon Micro-alloyed Steel with Mo
The dilatometric curves of low-carbon micro-alloyed steel with Mo at different cooling rates were detected on Gleeble-3800 thermo-mechanical simulator.The CCT curves of hot deformation were determined using thermal dilation measurement,and referencing microstructure observation and hardness measurement.The influences of cooling rate on microstructure and hardness of the steel were studied.The results show that bainite structure is obtained in any cooling rate.When the cooling rate is below 10℃/s,there is a certain mount of ferrite;When the cooling rate is below 1℃/s,there is a little pearlite besides ferrite;When the cooling rate is over 30℃/s,there is martensitic structure;When the cooling rate is in the range of 10～30℃/s,there is almost totally bainite structure.All these provide the references for productive practice to customize the parameters of rolling and cooling.