未再结晶区压下量对Ti微合金化低碳马氏体钢组织性能的影响

Effects of non-recrystallization rolling reduction on microstructure and mechanical properties of Ti microalloyed low carbon martensitic steel

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。

Effects of non-recrytallization rolling reduction on microstructure and mechanical properties of Ti microalloyed low carbon martensitic steel were analyzed by scanning electron microscopy ( SEM ) , transmission electron microscopy ( TEM ) , X-rays diffraction ( XRD) and phase analysis method .The results show that increasing the deformation in non-recrytallization zone , the microstructure of the steel becomes fine, the martensite plates are equiaxed.Meanwhile, the amount and size of TiC precipitates increase to 0.103% and even fine, respectively.The comprehensive mechanical properties are well owing to fine-grain strengthening, precipitation strengthening and dislocation strengthening .The yield strength and the impact energy of the steel are increased by 52 MPa and 16 J, respectively .