轧制工艺对高强抗震耐火钢板组织性能的影响

 为了提高建筑用钢的屈服强度,优化轧制工艺和降低生产成本,通过实验室轧钢并结合室温、高温拉伸试验以及扫描和透射电镜观察,研究了4种不同轧制工艺下的高强抗震耐火钢板的组织和力学性能。研究结果表明,试验用耐火钢板的组织主要由铁素体+粒状贝氏体组成。粗轧开轧温度较高时,试验用钢板的室温屈服强度和高温屈服强度都较高,粒状贝氏体的体积分数也较多。开轧和开冷温度较高时,试验钢板的高温屈服强度可以满足建筑用耐火钢板的力学性能要求。随着开冷温度的提高,试验钢板的屈服强度会进一步提高,但是组织中铁素体晶粒尺寸较大,而且塑性较差。根据冲击试验结果可以发现,随着冲击温度的降低,试验钢板的断裂吸收功下降较多。析出相分析结果表明,析出相主要是(Nb,Ti)C和(Ti,Nb,Mo)C,析出相颗粒尺寸较大。

Effect of rolling process on microstructure and properties of high strength anti-seismic fire resistant steel plates

In order to improve the yield strength of construction steel,optimize the rolling process and reduce production costs. Laboratory steel rolling experiments are combined with room temperature and high temperature tensile tests,as well as scanning and transmission electron microscopy observations. The microstructure and mechanical properties of high-strength anti-seismic refractory steel plates under four different rolling processes were studied. The results show that the microstructure of the steel plates are mainly composed of ferrite and granular bainite. When the rough rolling temperature is higher,the yield strength of room temperature and high temperature of the steel plates are higher,and the volume fraction of granular bainite is also large. When the rolling and cooling temperatures are high,the yield strength of the high temperature can meet the mechanical performance requirements of the construction fire-resistant steel plate. With the increase of the opening temperature,the yield strength of the test steel plate is further improved,but the ferrite in the structure is large and the toughness is poor. According to the results of the impact test,it can be found that as the impact temperature decreases,the fracture absorption work of the test steel plate decreases more. The analysis results of the precipitated phase show that the precipitated phases are mainly (Nb,Ti)C and (Ti,Nb,Mo)C,and the size of the precipitated phase is larger.