二相粒子对低碳铝镇静钢织构演变规律的影响

Effect of Second-phase Particles on Texture Evolution of Low Carbon Al-killed Steel

通过单向拉伸实验检测力学性能,利用透射电镜观察化学成分不同的两种低碳铝镇静钢的析出相粒子,利用X射线衍射仪测量钢中各种织构的含量。经73%的压下率冷轧和700℃×4h退火处理,2#试样比1#试样屈服强度高28MPa,抗拉强度高19MPa,r值低0.24。结果表明:1#试样的{111}织构含量在冷轧、退火过程中都增加,Goss织构含量都减少,{100}织构含量冷轧后增加,退火后又明显减少;2#试样退火过程中析出大量Al2O3粒子抑制AlN粒子的析出,且其作为新的形核质点改变了形核机制,退火后Goss织构和{100}织构含量增加,而{111}织构含量减少,r值降低,不利于深冲性能;细小的Al2O3粒子的析出形成了细晶强化和沉淀强化,试样的屈服强度和抗拉强度都明显升高。

Microstructure,mechanical properties and the content of different types of texture were investigated by means of TEM,tensile test and XRD.After cold rolling of 73% overall reduction and annealing at 700℃ for 4h,yield strength,tensile strength and r value of 2# sample is 28MPa higher,19MPa higher and 0.24 lower than those of 1# sample.The results show that the content of the texture of {111} for 1# sample increases obviously after the cold rolling and annealing process,the content of texture of Goss decreases,and texture strength of {100} increases after the cold rolling process and decreases after the annealing process obviously.The precipitation of Al2O3 particles in 2# sample during the annealing process inhibits the precipitation of AlN particles,changes the mechanism of nucleation as nuclear particle shape.The increasing texture content of {100} and Goss,decreasing texture content of {111},reducing value of r after annealing,which are not beneficial to deep-drawing performance.At the same time,small Al2O3 particles causes fine-grain strengthening and precipitation strengthening,and yield strength and tensile strength obviously increase.