Study on Processing Parameters of Q550 High Strength Engineering Machinery Steel
Taking Q550 high strength engineering machinery steel as research target,the effects of processing parameters on the microstructure and properties of the steel were studied.The results show that there are two kinds of states for stress-strain,including dynamic recrystallization and dynamic recovery.With cooling rate increasing,the grain size of bainite as well as distance between bainite and ferrite decrease,and the hardness increases firstly,and then decreases.The hardness reaches the maximum value of 346HV when the cooling rate is 30 ℃/s.The final rolling temperature should be below 900 ℃ in order to avoid the mixed crystal.
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