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设计了一种低碳抗拉强度为1000 MPa级的工程结构钢,通过使用扫描电子显微镜(SEM)和拉伸试验机等仪器研究了卷取温度对低碳合金钢的组织性能影响。结果表明:终卷取温度对实验钢组织和性能有较大影响,卷取等温温度较高时实验钢的组织以粒状贝氏体为主,卷取等温温度较低时以板条贝氏体为主。随着等温温度的上升,抗拉强度和屈服强度均呈先上升后下降的趋势,卷取温度控制在350℃时,获得最佳的力学性能,屈服强度和抗拉强度分别达到1026 MPa和1118 MPa,伸长率为12.1%。
A kind of engineering structural steel with a low carbon tensile strength of 1000 MPa was designed. The influence of coiling temperature on microstructure and properties of low carbon alloyed steel was studied by scanning electron microscopy (SEM) and tensile testing machine. The results show that the final coiling temperature has a significant effect on the microstructure and properties of the experimental steels. When the coiling temperature is high, the microstructure of the experimental steels mainly consists of granular bainite. When the coiling temperature is low, Mainly. With the increase of isothermal temperature, the tensile strength and yield strength both increased first and then decreased. When the coiling temperature was controlled at 350 ℃, the best mechanical properties were obtained. The yield strength and tensile strength reached 1026 MPa and 1118 MPa, elongation of 12.1%.