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通过SEM、TEM、XRD和EBSD等技术研究了连续退火工艺对深冲双相(DP)钢组织性能的影响。结果表明:深冲DP钢热轧板中存在大量的弥散(Nb,Ti)(C,N)等析出粒子,有效固定住C、N间隙原子。连续退火过程中,快速加热,可减少回复阶段变形储能的释放,提高有利再结晶织构的形核率;慢速加热,可促进碳氮化合物的回溶,降低弥散析出相对再结晶织构的不利作用;采用先快速后慢速分段式加热工艺,以再结晶开始温度为分界点,既充分发展深冲织构,又确保双相结构,得到退火板性能为:抗拉强度485 MPa,伸长率超过30%,r值达到1.3。
The effects of continuous annealing process on the microstructure and properties of deep drawing dual phase (DP) steel were studied by means of SEM, TEM, XRD and EBSD. The results show that there are a large number of precipitated particles such as dispersed (Nb, Ti) (C, N) in hot-dip deep drawing DP steel plate and effectively fix C and N interstitial atoms. In the process of continuous annealing, rapid heating can reduce the release of stored energy during the recovery phase and increase the nucleation rate of favorable recrystallized texture. Slow heating can promote the back-dissolution of carbonitride and reduce the relative recrystallization texture Of the adverse effects; the use of rapid after the first step slow heating process, the recrystallization start temperature as the dividing point, both fully developed deep-drawing texture, but also ensure that the dual-phase structure, the performance of the annealed board: tensile strength 485 MPa , Elongation of more than 30%, r value of 1.3.