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通过观察萃取复型试样和薄膜试样,分析X100管线钢中析出相;结合析出相析出动力学模型,讨论在先析出TiN相界面形核和位错线形核动力学特征。结果表明:X100管线钢析出相多呈复合析出,先析出的TiN相周边附着许多富Nb的细小析出相,更加细小的椭圆形析出相富含Nb,方形析出相富含Ti。Nb(C,N)析出动力学计算结果表明:Nb(C,N)在TiN相界面形核较位错线形核具有较大的临界形核半径、更高的最大相对形核率温度和析出鼻点温度,形变储能对鼻点温度的影响近似线性关系。
By observing the sample of compound and thin film, the precipitation phase in X100 pipeline steel was analyzed. Based on the precipitation kinetics model, the nucleation and dislocation linear nucleation dynamics of TiN phase interface were discussed. The results show that the precipitated phases of X100 pipeline steel mostly show compound precipitation. Many precipitates of Nb-rich phase are attached to the periphery of the precipitated TiN phase. The finer oval precipitates are rich in Nb and the precipitates in the square are rich in Ti. The results of Nb (C, N) precipitation kinetics show that the nucleation of Nb (C, N) at the TiN phase interface has larger critical nucleation radius, higher maximum relative nucleation rate and precipitation The influence of nasal temperature and deformation energy storage on the temperature of the nasal point is approximately linear.