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通过本文实验用钢的研究,证明了下贝氏体碳化物的来源用透射电镜(TEM)证实下贝氏体碳化物在下贝氏体铁素体宽面上巨型台阶前沿析出,且呈楔状形态,楔根(较粗的一端)源于巨型台阶前沿、楔尖指向奥氏体基体内部;随着离α/γ界面距离的增加,楔状碳化物截面逐渐变细,最后演变为楔尖状实验表明:下贝氏体碳化物优先在α/γ界面上巨型台阶阶面前沿形核,或在界面附近奥氏体侧形核,也可在贝氏体铁素体亚片条间奥氏体内形核,然后向相邻奥氏体基体一侧长大本文在实验基础上提出下贝氏体碳化物的形核长大模型
Through the experimental steel used in this paper, it is proved that the source of lower bainite carbides confirmed by transmission electron microscopy (TEM) that lower bainite carbides precipitated on the leading edge of the giant step below the lower bainitic ferrite and showed a wedge shape , The wedge root (coarser one) originates from the leading edge of the giant step, and the wedge tip points inside the austenite matrix. As the distance from the α / γ interface increases, the cross-section of the wedge carbide gradually becomes thinner, The results show that the lower bainite carbides preferentially nucleate at the front of the giant step surface at the α / γ interface or nucleate at the austenite side near the interface, and can also be between the bainitic ferrite sub-strip austenite Intrinsic nuclei, and then grow to one side of the adjacent austenite matrix In this paper, based on the experiment proposed lower bainite carbide nucleation and growth model