铁素体区热轧工艺对Ti-IF钢深冲性能的影响

利用光学显微镜、扫描电镜以及电子探针,研究了Ti-IF钢在铁素体区轧制时不同的轧制温度、压下量以及润滑条件对钢板的组织结构以及析出物析出方式的影响.结果表明,轧制温度的降低和变形量的增加,都会导致形核率增大,晶粒尺寸减小,并且使晶体结构中{111}取向加强.润滑条件主要影响试样的表面晶粒尺寸,润滑条件越好,表面晶粒尺寸越接近于中心晶粒尺寸.析出物多以单独析出为主,Ti(C,N)-Al_2O_3由外延生长机制复合而成.

Effect of ferritic region hot-rolling on deep draw ability of Ti-IF steel

The effect of the different rolling temperature, reduction and lubrication conditions on the microstructure and the way of precipitation of Ti-IF steel rolled in the ferrite zone were studied using optical microscope, scanning electron microscope and electron probe. The results show that with the rolling temperature increasing and reduction decrea-sing, the nucleation rate increases which refines the grain size, and the orientation of {111} in the crystal structure is strengthened. The lubrication conditions mostly influece the surface grain size of the samples, and the better the lubri-cation conditions are, the closer the surface grain size is to the center grain size. The precipitation mainly appears inde-pendently, and the formation mechanism of Ti (C, N)-Al_2O_3 is epitaxial growth.