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材料工程  2019, Vol. 47 Issue (10): 82-89    DOI: 10.11868/j.issn.1001-4381.2018.001141
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
Q460FRW耐火钢的组织稳定性
马龙腾, 王彦峰, 狄国标, 杨永达, 黄乐庆, 李春智
首钢集团有限公司 技术研究院, 北京 100043
Microstructural stability of Q460FRW fire-resistant steel
MA Long-teng, WANG Yan-feng, DI Guo-biao, YANG Yong-da, HUANG Le-qing, LI Chun-zhi
Research Institute of Technology, Shougang Group Co., Ltd., Beijing 100043, China
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摘要 采用Thermo-Calc热力学软件计算Q460FRW耐火钢的平衡态析出相。利用金相显微镜、扫描电子显微镜、透射电子显微镜观察和分析Q460FRW耐火钢600℃保温处理前后的基体与析出相演变。结果表明:600℃下的平衡态析出相由M7C3M23C6M=Fe,Cr,Mo,Mn)和MXM=Nb,Ti;X=C,N)构成。热机械控制工艺下,组织主要由粒状贝氏体和针状铁素体构成。600℃保温处理后,粒状贝氏体中的M/A组元逐渐分解,针状铁素体逐渐转变为块状铁素体。随600℃下保温时间的延长,富Cr/Mn的M7C3相尺寸持续增加,富Nb/Ti的MX相尺寸在小幅度增加后保持稳定,未发现M23C6型析出相。在保温过程中,Mo主要以固溶态存在,其对耐火性能的作用主要为固溶强化。
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马龙腾
王彦峰
狄国标
杨永达
黄乐庆
李春智
关键词 Q460FRWM/A组元析出相组织演变    
Abstract:The precipitates in Q460FRW fire-resistant steel under equilibrium state were calculated using Thermo-Calc thermodynamic software. The evolutions of matrix and precipitates in this steel before and after high temperature exposure at 600℃ were experimentally observed and analyzed using optical microscopy(OM), scanning electron microscopy(SEM) and transmission electron microscopy (TEM). The results show that the precipitates under equilibrium state at 600℃ are carbides including M23C6, M7C3 (M=Fe, Cr, Mo, Mn) and MX (M=Nb,Ti;X=C,N). The matrix of this steel at TMCP (thermo-mechanical control process) state consists of granular ferrite and acicular ferrite. After soaking at 600℃, M/A constitutes decompose gradually, while the acicular ferrite is transformed into bulk ferrite. Besides, longer exposure time brings about larger size of M7C3 particles, while the size of MX particles increases after short time heating and keeps constant with longer exposing time. During the heating process, no M23C6 particles are found, while most of Mo addition contributes to solid-solution strengthening effect.
Key wordsQ460FRW    M/A constitute    precipitate    microstructural evolution
收稿日期: 2018-09-28      出版日期: 2019-10-12
中图分类号:  TG142.1  
通讯作者: 马龙腾(1988-),男,工程师,博士,研究方向为钢铁材料的组织与性能,联系地址:北京市石景山区杨庄大街69号首钢技术研究院宽厚板研究所(100043),E-mail:m_l_t_@msn.com     E-mail: m_l_t_@msn.com
引用本文:   
马龙腾, 王彦峰, 狄国标, 杨永达, 黄乐庆, 李春智. Q460FRW耐火钢的组织稳定性[J]. 材料工程, 2019, 47(10): 82-89.
MA Long-teng, WANG Yan-feng, DI Guo-biao, YANG Yong-da, HUANG Le-qing, LI Chun-zhi. Microstructural stability of Q460FRW fire-resistant steel. Journal of Materials Engineering, 2019, 47(10): 82-89.
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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2018.001141      或      http://jme.biam.ac.cn/CN/Y2019/V47/I10/82
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