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研究了低合金高强度调质钢的轧制方式及轧后冷速对调质后微观组织及力学性能的影响。结果表明:在试验条件下,试验钢采用不同轧制方式及冷速获得不同淬火加热前的初始组织及力学性能,但调质后却具有相同的微观组织和力学性能。建议低合金高强度调质钢采用一阶段的轧制方式,终轧温度应高于奥氏体部分再结晶区的上限温度,轧后采用适宜的冷速(4~15℃/s)进行加速冷却。以此工艺调质后的试验钢具有较高的均匀性,与现行TMCP工艺相比,强塑性和强韧性更为优异。
The effects of rolling mode and post-rolling cooling rate on the microstructure and mechanical properties of quenched and tempered low-alloy high-strength quenched and tempered steel were studied. The results show that the initial microstructure and mechanical properties of the test steel under different quenching and heating conditions are obtained by different rolling methods and cooling rates under the test conditions, but the same microstructure and mechanical properties after quenching are obtained. It is suggested that the low-alloy high-strength quenched and tempered steel adopt the first-stage rolling method, the finish rolling temperature should be higher than the upper austenite recrystallization zone upper limit temperature, and the speed of rolling (4-15 ° C / s) cool down. With this process, the test steel after tempering has higher uniformity, and has more excellent ductility and toughness compared with the current TMCP process.