模拟火灾温度对Q460FRW钢组织和抗震性能的影响

doi:10.13251/j.issn.0254-6051.2021.04.007

金属热处理 ›› 2021, Vol. 46 ›› Issue (4): 37-41.DOI: 10.13251/j.issn.0254-6051.2021.04.007

模拟火灾温度对Q460FRW钢组织和抗震性能的影响

戴忠伟, 何宜柱, 杜晓洁

安徽工业大学材料科学与工程学院, 安徽马鞍山 243032

收稿日期:2020-10-03 出版日期:2021-04-25 发布日期:2021-05-08
通讯作者: 何宜柱(1962—),男,教授,主要研究方向为金属材料,E-mail:heyizhu@ahut.edu.cn
作者简介:戴忠伟(1994—),男,硕士研究生,主要研究方向为建筑用钢,E-mail:1329502010@qq.com。
基金资助:
国家重点研发计划(2017YFB0304702)

Effect of simulated fire temperature on microstructure and anti-seismic performance of Q460FRW steel

Dai Zhongwei, He Yizhu, Du Xiaojie

School of Materials Science and Engineering, Anhui University of Technology, Ma'anshan Anhui 243032, China

Received:2020-10-03 Online:2021-04-25 Published:2021-05-08

摘要/Abstract

摘要： 为研究Q460FRW钢经火灾后的抗震性能,在250~650 ℃范围内对TMCP态试样进行了6组模拟火灾保温试验,并对保温后的显微组织、拉伸断口形貌和室温拉伸性能进行了分析。结果表明:TMCP态试样的组织为粒状贝氏体,随着保温温度的升高,粒状贝氏体中的铁素体基体不断长大,马氏体/奥氏体(M/A)组元逐渐分解并由多边形岛状逐渐转变为层状;屈服强度和抗拉强度随保温温度的升高均呈先增大后减小趋势,屈强比逐渐增大,塑性和抗震性能不断下降。当火灾温度低于550 ℃、持续时间少于1 h时,试验钢抗震性能仍能满足GB/T 19879—2015和GB/T 28415—2012标准对高性能建筑用钢和耐火钢的要求。

关键词: 建筑用钢, 火灾温度, M/A组元, 屈强比, 抗震性能

Abstract: In order to study the anti-seismic performance of Q460FRW steel in fire as a disaster, six groups of thermal insulation tests in the range of 250-650 ℃ were conducted on the tested steel, and the microstructure, tensile fracture morphologies and tensile properties at room temperature of the tested steel after insulation test in fire were studied. The results show that the microstructure of the specimens in TMCP state is granular bainite. With the increase of holding temperature, the ferrite matrix in granular bainite continues to grow, the martensitic/austenitic (M/A) components gradually decompose and change from a polygonal island to a lamellar structure. The yield strength and tensile strength both increase first and then decrease with the increase of holding temperature, the yield ratio gradually increases, the plasticity and the anti-seismic performance continues to decline. When the temperature is lower than 550 ℃ and the duration in fire is less than 1 h, the anti-seismic performance of the tested steel can still meet the requirements of the standard GB/T 19879—2015 and GB/T 28415—2012 for high-performance building steel and fire-resistant steel.

Key words: construction steel, fire temperature, M/A component, Y/T ratio, anti-seismic performance

中图分类号:

TG142.1

戴忠伟, 何宜柱, 杜晓洁. 模拟火灾温度对Q460FRW钢组织和抗震性能的影响[J]. 金属热处理, 2021, 46(4): 37-41.

Dai Zhongwei, He Yizhu, Du Xiaojie. Effect of simulated fire temperature on microstructure and anti-seismic performance of Q460FRW steel[J]. Heat Treatment of Metals, 2021, 46(4): 37-41.

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模拟火灾温度对Q460FRW钢组织和抗震性能的影响

Effect of simulated fire temperature on microstructure and anti-seismic performance of Q460FRW steel

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