摘要
耐热钢的开发及其应用技术是发展超超临界发电技术的重要基础。本文研究分析了服役过程中失效的部分HR3C弯管的组织与性能变化。发现随着服役时间的延长,HR3C硬度升高,析出相数量增加、尺寸长大;热力学计算结果也表明M23C6相的析出倾向较大;加工过程中形成的孪晶组织提高了HR3C的硬度,降低了韧性。
The development and application of heat-resistant steel is the key issue in USC technology.The microstructure and mechanical propertie of ultra-supercritical boiler’s HR3 C tube was summarized after service using.The second-phase particles’ precipitation and the mechanical properties’ transformation discipline were analyzed.The results show that the number and the size of the precipitating in the steel increase with the aging time and the hardness decreasing.Two precipitates are inspected using CALPHAD technical.They are M23C6 carbides.The deformation twins raise the hardness and reduce the toughness of the tube.
出处
《热加工工艺》
CSCD
北大核心
2015年第6期241-243,共3页
Hot Working Technology
关键词
HR3C
耐热钢
析出相
HR3C
heat-resistant steel
precipitate
