摘要
设计了两种不同Cr含量460 MPa级抗震耐火建筑用钢,并进行了室温和高温机械性能检测,0.4%Cr和0.8%Cr试验钢的性能均满足抗震钢屈强比≤0.83,并且耐火钢600℃保温3 h后屈服强度≥307 MPa的标准。JMatPro热力学软件对460 MPa级抗震耐火建筑用钢的析出相进行计算,采用光学显微镜和透射电子显微镜方法对钢中的析出相进行了分析。结果表明,试验钢随Cr含量的升高,室温抗拉强度升高,屈强比降低,具有更好的抗震性能。Cr的增加,减少了高温稳定性较差的析出相的析出,降低了析出相中Mo的含量,促使Mo更多地溶入基体中,从而提高了抗震钢的高温固溶强化作用和耐火性能。
The anti-seismic and fire-resistant 460 MPa construction steels with different Cr content were designed to analyze the microstructure,performance at room temperature and elevated temperature.Both 0.4%Cr and 0.8%Cr steels meet the standards of anti-seismic and fire-resistant steel,that is,yield ratio is less than 0.83 and yield strength is more than 307 MPa after 3 hours soaking at 600℃.The precipitations were simulated and analyzed by simulation software and using OM and TEM.It is concluded that increasing Cr content has an effect on improving of yield stress at room temperature and the reduction of yield strength ratio.With the increase of Cr content,high elevated temperature instability precipitations and the content of Mo in the precipitations can be decreased and Mo in the matrix can be raised.It has a positive effect on enhanced high elevated temperature solution strengthening and fireresistance of construction steel because of Mo solid solutions.
作者
杜平
武凤娟
曲锦波
丛菁华
王学敏
Du Ping;Wu Fengjuan;Qu Jinbo;Cong Jinghua;Wang Xuemin(Branch of Plate and Strip,Institute of Research of Iron and Steel,Sha Steel Group,Zhangjiagang 215625,Jiangsu,China;School of Material Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《钢铁钒钛》
CAS
北大核心
2021年第4期138-143,共6页
Iron Steel Vanadium Titanium
基金
国家重点研发计划资助项目(2017YFB0304700)。
