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通过Gleeble3800热模拟机探究X80级管线钢控轧控冷过程中的组织演变规律利用拉伸试验机、金相显微镜(OM)、扫描电镜(SEM)和透射电镜(TEM)对试验钢的力学性能和显微组织进行了研究。结果表明,随着钢的板厚规格减小,准多边形铁素体晶粒尺寸减小,强度升高。450℃模拟卷取过程中准多边形铁素体形核可进一步发生长大。富碳贝氏体组织主要是在450℃模拟卷取过程中由碳化物析出和相变所得的板条贝氏体组织组成,钢中形成的富碳贝氏体组织构成了带状组织。
Through the Gleeble3800 thermal simulator, the microstructure evolution of the X80 grade steel during controlled rolling and controlled cooling was investigated. The mechanical properties of the test steel were investigated by tensile testing machine, optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscopy (TEM) And microstructures were studied. The results show that the grain size of quasi-polygonal ferrite decreases and the strength increases as the thickness of steel decreases. The quasi-polygonal ferrite nucleation at 450 ℃ simulated coiling may occur further. The carbon-rich bainite structure mainly consists of lath bainite structure obtained by carbides precipitation and phase transformation in a simulated coiling process at 450 ° C. The carbon-rich bainite structure formed in the steel forms a banded structure.