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利用电子背散射衍射(EBSD)技术和高分辨透射电子显微镜(HRTEM)对不同和Mn含量的CSP工艺Ti微合金钢进行了显微组织分析与析出相特征观察.结果表明:与Ti和Mn含量较低的钢相比,Ti和Mn含量较高的钢中,不仅小角度晶界分布比例较高.同时颗粒尺寸在10 nm以下的TiC粒子析出数量显著增加.而较大尺寸的M_3C相(Fe_3C)析出数量却有所减少.此外,强化机理分析表明.细晶强化与位错强化对两实验钢的屈服强度贡献最大,而深沉析出强化是造成两实验钢强度差别的主要原因.
The microstructure and precipitated phase of CSP Ti microalloyed steels with different and Mn content were investigated by electron backscatter diffraction (EBSD) and high resolution transmission electron microscopy (HRTEM). The results show that with Ti and Mn content In the steels with higher Ti and Mn content, the distribution of small-angle grain boundaries is higher than that of the lower steels, and the number of precipitated TiC particles with a particle size below 10 nm is significantly increased, whereas the larger size M 3 C phases Fe_3C) decreased, and the strengthening mechanism analysis showed that fine grain strengthening and dislocation strengthening contributed the most to the yield strength of the two experimental steels, whereas the deep precipitation strengthening was the main reason for the difference in strength between the two experimental steels.