退火工艺对DP590双相钢组织与力学性能的影响

Effect of annealing process on microstructure and mechanical properties of DP590 dual-phase steel

利用实验室连续退火模拟机研究了冷却速度和退火温度对DP590双相钢组织与力学性能的影响。结果表明:随着冷却速度的增加,试样的屈服强度、抗拉强度呈上升的趋势,伸长率逐渐下降,但冷却速度在40℃/s以上时,抗拉强度趋于稳定。快冷后为获得铁素体+马氏体双相组织,所需的临界冷却速度为30℃/s;随着退火温度的升高,试样的屈服强度和抗拉强度先上升后下降,伸长率先下降后上升。

Effect of annealing process on microstructure and mechanical properties of DP590 dual-phase steel was studied by using laboratory annealing furnace.The results show that with the cooling rate increasing,the yield strength and tensile strength increase,the total elongation decreases gradually,but the tensile strength tends to be stable when the cooling rate is above 40℃/s.In order to obtain dual phase microstructure(ferrite and martensite),the critical cooling rate is 30℃/s.With the annealing temperature increasing,the yield strength and tensile strength both increase first and then decrease,and the total elongation decreases first and then increases.