在连续退火水淬模拟试验装置上对0.18C-0.4Si-2.0Mn微合金化超高强度冷轧薄带钢进行了不同工艺的连续退火水淬试验, 并对其显微组织与拉伸性能进行了研究。结果表明: 保温温度低于800 ℃时, 保温时间对组织和性能的影响显著, 其组织主要为片状马氏体; 当温度高于830 ℃时, 保温时间对抗拉强度和伸长率影响较小, 组织主要为板条马氏体; 随保温温度和水淬温度的升高, 试验钢的抗拉强度由1 150 MPa逐渐升至1 700 MPa, 屈服强度由600 MPa增至1 600 MPa, 断后伸长率则由8.5%逐渐降至2%; 水淬工艺的保温温度和水淬温度分别在830 ℃和750 ℃或保温温度在850 ℃和水淬温度高于700 ℃时, 试验钢的抗拉强度可达1 500 MPa以上, 屈服强度可达1 200 MPa。

Series continuous annealing water quenching tests were completed for 0.18C-0.4Si-2.0Mn microalloyed cold rolled ultra high strength steel strip on the test bench, the microstructure and tensile properties were studied. The results show that the holding time had a significant effects on microstructure and tensile properties when the holding temperature was below 800 ℃ and the microstructure was mainly lamellar martensite, when the holding temperature was higher than 830 ℃, the holding time showed less effects on tensile strength and elongation, and the microstructure was mainly lath martensite. With the increase of holding temperature and water quenching temperature, the tensile strength increased from 1 150 MPa to 1 700 MPa, yield strength increased from 600 MPa to 1 600 MPa and the elongation reduced from 8.5% to 2% gradually. When the holding temperature and water quenching temperature was 830 ℃ and 750 ℃, or holding temperature was 850 ℃ and water quenching temperature was higher than 700 ℃, the tensile strength was higher than 1 500 MPa and yield strength up to 1 200 MPa at the same time.