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通过扫描电镜、透射电镜、X射线衍射、相分析等手段,研究了钢坯轧制过程中低温未再结晶区压下量对含Ti微合金钢组织和力学性能的影响。结果表明,加大低温未再结晶区压下量,使钢的组织细化,马氏体板块等轴化;析出相TiC含量增加到0.103%,且尺寸细小;在细晶强化、析出相沉淀析出强化及位错强化作用下,钢的屈服强度和冲击吸收能量分别提升了52 MPa和16 J,综合力学性能良好。
The microstructure and mechanical properties of Ti-containing microalloyed steels were investigated by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and phase analysis. The results show that the reduction of the amount of unrecrystallized zone increases the microstructure of the steel and the martensite plate equiaxed. The content of TiC in the precipitated phase increases to 0.103% and the size of the precipitated phase is small. Under precipitation strengthening and dislocation strengthening, the yield strength and impact absorption energy of steel increased by 52 MPa and 16 J, respectively, showing good comprehensive mechanical properties.