摘要
为进一步评估C-HRA-1锅炉管在700℃先进超超临界(advanced ultra-supercritical,A-USC)火电机组高温受热面中的适用性,对华能南京电厂700℃关键部件试验验证平台上服役的C-HRA-1合金管样进行定期取样和检测分析。结合材料的力学性能测试、显微组织分析和内外壁形貌表征,对最长运行时间达35573h的4组C-HRA-1合金受热面管进行对比研究。结果表明,C-HRA-1锅炉管在室温、700℃高温拉伸的规定塑性延伸强度、抗拉强度和布氏硬度均在服役10523h时达到最大值,然后随服役时间增长逐渐下降,同时冲击性能等也在服役10523h后较备品有明显降低;随后均随服役时间延长缓慢变化。显微组织中的γ′强化相的粗化动力学过程符合LSW理论,内外壁氧化腐蚀层的增厚以高温氧化为主。结果可知,C-HRA-1合金作为700℃A-USC机组高温候选材料,在服役35573h间表现出较好的力学性能和显微组织稳定性。
In order to further evaluate the applicability of C-HRA-1 boiler tube in the high-temperature heating surface of a 700 ℃ advanced ultra-supercritical(A-USC) thermal power unit, regular sampling and testing analyses were carried out on C-HRA-1 tube samples operating on the 700℃ A-USC component test facility of Huaneng Nanjing Power Plant. Four groups of C-HRA-1 tube samples with the longest running duration of 35573 h were systematically studied by means of mechanical property tests, microstructural analyses, and inner and outer wall morphology characterization. Results show that the tensile properties and Brinell hardness of C-HRA-1 boiler tube at room temperature and 700℃ reach the maximum value at 10523 h, and then decrease with the increasing of service time. At the same time, the impact toughness decreases significantly at 10523 h compared with the spare parts, and then it is kept stable with the extension of service time. The kinetic process of γ’ coarsening conforms to LSW theory, and the thickening of inner oxides and outer corrosion layer is mainly due to high temperature oxidation. In general, the C-HRA-1 boiler tube exhibits good mechanical properties and microstructure stability during 35573 h of service.
作者
李季
唐丽英
周荣灿
钟犁
何源
刘卫国
李小敏
赵海平
李江
LI Ji;TANG Liying;ZHOU Rongcan;ZHONG Li;HE Yuan;LIU Weiguo;LI Xiaomin;ZHAO Haiping;LI Jiang(Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,Shaanxi Province,China;Beijing Huaneng Yangtze Environmental Technology Research Institute Co.,Ltd.,Changping District,Beijing 102209,China;Nanjing Power Plant,Huaneng Power International Jiangsu Energy Development Co.,Ltd.,Nanjing 210035,Jiangsu Province,China;Baowu Special Metallurgy Co.,Ltd.,Baoshan District,Shanghai 200940,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2022年第18期6580-6587,共8页
Proceedings of the CSEE
基金
国家重点研发计划项目(2018YFB0604400)。
