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采用连续退火模拟试验机研究了连续退火工艺中缓冷及过时效温度对DP980冷轧高强钢组织性能的影响规律,并利用扫描电镜、透射电镜及拉伸试验机进行了显微组织及力学性能检测。研究结果表明:缓冷温度降低有利于新生铁素体及富碳岛状马氏体的生成,且实验钢屈服强度基本不变,抗拉强度先下降后升高,伸长率逐渐上升。缓冷温度为650℃时,强塑积(PSE)达到最大值15.55GPa·%。随着过时效温度的升高,实验钢抗拉强度及屈服强度略有下降,断后伸长率显著升高。工业试制HC550/980DP成品的屈服强度不小于570 MPa,抗拉强度不小于1 080 MPa,伸长率不小于7%,达到应用标准。
The effects of slow cooling and over aging temperature on the microstructure and properties of DP980 cold rolled high strength steel were studied by continuous annealing simulator. The microstructure and mechanical properties of the DP980 cold rolled high strength steel were studied by scanning electron microscopy, transmission electron microscopy and tensile testing machine Detection. The results show that the slow cooling temperature is conducive to the formation of fresh ferrite and carbon-rich martensite, and the yield strength of the experimental steel is basically unchanged, the tensile strength first decreases and then increases, and the elongation increases gradually. When the slow cooling temperature is 650 ℃, the maximum plastic modulus (PSE) reaches 15.55GPa ·%. With the increase of over-aging temperature, the tensile strength and yield strength of experimental steel decreased slightly, and the elongation at break increased significantly. Industrial trial production HC550 / 980DP finished product yield strength of not less than 570 MPa, tensile strength of not less than 1 080 MPa, elongation of not less than 7%, to meet the application standards.