DP590冷轧板热处理的组织和性能

为了加速国内双相钢的开发和应用，采用CAS-300Ⅱ模拟退火实验机，通过模拟退火实验，研究了加热速率、临界区退火温度、过时效温度、过时效时间对DP590双相钢组织性能的影响.结果表明，加热速率在5~60℃/s内增加时，屈服强度、抗拉强度均增加，延伸率、强塑积均减小；临界区退火温度在780~850℃内增加时，屈服强度、抗拉强度先减小后增加，延伸率、强塑积均增加；过时效温度在260~400℃内增加时，屈服强度增加，抗拉强度减小，延伸率整体呈增加趋势，屈强比增加；在280℃进行过时效，过时效时间在240~480s内增加时，屈服强度、抗拉强度均减小，延伸率、强塑积先减小后增加.

Microstructure and Performance of DP590 Cold Rolled Steel Strip After Heat Treatment Processes

In order to accelerate the development and application of the domestic dual phase steel， the effects of the heating speed， intercritical annealing temperature， overaging temperature， and the time of overaging on the microstructure and properties of DP590 dual phase steels were studied by a CAS 300Ⅱannealing simulator. The results showed that the yield strength and tensile strength both increased and the elongation and product of strength and ductility both decreased with the increase of the heating speeds between 5 and 60℃/s. The yield strength and tensile strength both decreased first， then increased， the elongation and product of strength and ductility both increased with the increase of intercritical annealing temperatures between 780 and 850℃， The yield strength increased， the tensile strength decreased， the elongation increased generally， the yield ratio increased apparently with the increase of the overaging temperature between 260 and 400℃. When the overaging temperature was 280℃， the yield strength and tensile strength both decreased， the elongation and product of strength and ductility decreased first， then increased with the increase of the over aging time within the range of 240~480s.