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采用TEM、SEM技术和光学显微分析等方法,研究了不同变形量对热轧Si-Mn系双相钢组织与力学性能的影响。试验结果表明,组织形貌为岛状的马氏体弥散分布在细小的铁素体基体中,可以使热轧双相钢获得良好的综合机械性能。随着变形量的增加,第二相的体积分数增加,但第二相随着变形量增加严重偏析,且热轧双相钢的屈服强度和抗拉强度先增加后降低、屈强比升高、塑性降低。综合分析表明,当变形量为92.1%时,抗拉强度平均达到795.66 MPa,力学性能最佳。
The effects of different deformations on the microstructure and mechanical properties of hot-rolled Si-Mn dual phase steel were studied by TEM, SEM and optical microscopy. The experimental results show that martensite with island morphology is dispersed in fine ferrite matrix, which can make the hot rolled dual phase steel obtain good comprehensive mechanical properties. With the increase of the deformation, the volume fraction of the second phase increases, but the second phase seriously segregates with the increase of deformation, and the yield strength and tensile strength of hot-rolled dual-phase steel first increase and then decrease, and the yield ratio increases Plasticity is reduced. Comprehensive analysis shows that when the deformation amount is 92.1%, the tensile strength reaches an average of 795.66 MPa, and the mechanical properties are the best.