利用Gleeble-1500型热模拟试验机测定了微合金铁素体-贝氏体双相钢变形后的连续冷却转变曲线；根据试验钢相变规律，研究了单道次变形后分（两）段水冷工艺的保温时间和保温温度对试验钢显微组织和力学性能的影响。结果表明：随着保温温度的升高（630-700℃），试验钢铁素体尺寸略微增大，强度和伸长率先增大后减小，在保温温度为680oC时性能最佳；680℃时随着保温时间的延长（5～10s），铁素体晶粒尺寸逐渐增大，均为等轴状，其强度和伸长率呈下降趋势，在保温时间为5S时综合性能最佳。
The continuous cooling transformation diagram of microalloyed ferrite-bainite dual-phase steels after hot deformation was tested by using Gleeble-1500 hot simulator. In the light of the phase transformation rule of test steels, the effects of holding time and holding temperature on the microstructure and mechanical properties of test steels were investigated in step-cooling process after one-pass deformation. Results show that the ferrite grain size slightly increased with the holding temperature increased from 630℃ to 700 ℃, while the strength and elongation increased first and then decreased. The optimized holding temperature was 680 ℃ With prolongation of the holding time from 5 s to 8 s at 680 ℃, the ferrite grain increased gradually in size and was equiaxed, while the strength and elongation of test steels declined. And the optimized combined properties can be given when holding time was 5 s.
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