再结晶区轧制工艺参数对X80管线钢组织及织构的影响

通过单道次和双道次热模拟实验,研究了变形量20%～50%在980、1000、1020 ℃变形温度、1000℃下不同变形量(25%～40%)以及1 000℃变形后间隔不同时间(1～20 s)的再结晶区的轧制过程。结合金相检测、电子背散衍射(EBSD)及X-射线衍射(XRD)等检测方法表征和分析了变形过程中的间隔时间、变形温度和变形量对晶粒尺寸、解理单元尺寸以及织构的影响。结果表明,随着再结晶间隔时间的减少、再结晶区变形温度的降低和变形量的增加,组织晶粒尺寸和解理单元尺寸均细化显著。当变形温度降低至980 ℃时,可获得更多的{110}滑移面,使得韧性提高。

Affect of Technological Parameter of Recrystallization Zone Rolling on Microstructure and Texture of X80 Pipeline Steel

Through single pass and two pass thermal simulation experiment, the rolling process in recrystallization zone with deformation 20% ~ 50% at deformation temperature 980,1 000,1 020 °C , and with different deformation 25%~40% at 1000°C ,and interval time (1~20 s) after deformed at 1000°C is studied. And the affect of deformation process interval time, deformation temperature and deformation quantity on grain size, cleavage unit size and texture are characterized and analyzed through metallographic examination, EBSD ( Electron Backscattering Diffraction) and X-ray deffraction (XRD). The results show that microstructure grain size and cleavage unit size greatly refine with recrystallization interval time decreasing, deformation temperature decreasing in recrystallization zone and deformation increasing. When deformation temperature decreases to 980°C，more{110} glide plane can be obtained, thereby increasing toughness.