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采用扫描电镜和拉伸试验机研究了C-Mn-Mo-Ni-Nb-Ti-V系低碳微合金钢950℃淬火和560~640℃回火调质处理对钢微观组织及力学性能的影响。结果表明,轧态钢板中含有大量细小均匀的粒状贝氏体(GB)组织,有良好的强韧性。调质后,试验钢获得板条贝氏体及铁素体的混合组织,随回火温度的升高,板条贝氏体回复作用逐渐加强,相邻板条合并,致使组织粗化。试验钢经950℃淬火+640℃回火后,其强度下降,韧性和塑性明显提高,伸长率为26.9%,-20℃夏比冲击吸收能量为392 J,断口剪切面积达到100%。
The microstructure and mechanical properties of C-Mn-Mo-Ni-Nb-Ti-V low-carbon microalloyed steel quenched at 950 ℃ and tempered at 560-640 ℃ were studied by scanning electron microscopy and tensile testing machine influences. The results show that the rolled steel plate contains a large number of small and uniform granular bainite (GB), with good toughness. After quenching and tempering, the test steel obtained bainite and ferrite mixed tissue, with the tempering temperature increases, the slab bainite recovery gradually strengthened, the adjacent slats merged, resulting in coarse tissue. After quenching at 950 ℃ and tempering at 640 ℃, the strength of the test steel decreased, the toughness and ductility increased obviously, the elongation was 26.9%, the Charpy absorbed energy at -20 ℃ was 392 J, and the shear area of the fracture reached 100%.