服役态及时效态Super304H耐热钢结构损伤及力学性能衰减的对比研究  

Comparative Study on Structural Damage and Mechanical Properties Degradation of Serviced and Aging Super304H Heat-Resistant Steel

作　　者：陈国宏[1] 白小龙[2] 刘俊建[1] 王家庆[1] 汤文明[2] 

机构地区：[1]安徽省电力科学研究院,合肥市230601 [2]合肥工业大学材料科学与工程学院,合肥市230009

出　　处：《电力建设》2013年第9期105-111,共7页Electric Power Construction

基　　金：安徽省电力科学研究院科技发展基金([2011]QTXM1336)

摘　　要：为探究Super304H钢在高温条件下的结构损伤和力学性能,以超超临界机组中在温度863 K下服役20 000 h的Super304H再热器管材及与其具有相同P函数值、在温度923 K下时效1 100 h的Super304H管材为对象,研究长期服役态Super304H再热器管材组织结构的老化,并开展相同P函数下的时效态与服役态Super304H钢管显微组织老化及力学性能衰减的对比研究。结果表明:钢管内、外壁运行条件的不同导致其显微组织结构产生差异;服役态钢管内侧的显微组织结构、力学性能与具有相同P函数的时效态Super304H钢管相似;然而,服役态钢管外侧的结构损伤比时效态更严重。因此,建立在Larson-Miller参数基础上的人工时效方法,只能在特定条件下模拟服役态钢管的结构损伤。In order to study the structural damage and mechanical property of Super304H steel in high temperature condition, two kinds of the Super304H heat-resistant steel were taken as research object ： one was serviced at 863 K for 20 000 h as the reheater in an ultra-supercritical unit and the other was aged at 923 K for 1 100 h with the same P function value. The structure aging of the Super304H reheater was investigated after running for a long term, and the microstructure aging and mechanical properties degradation were studied on serviced and aging super304H steel tubes with same P function value. The results show that microstructures of the inner/outer side of the steel tube are heterogeneous due to their different running environments. The microstructure and mechanical properties of the inner side of the serviced Super304H steel tube are approximately equal to those of the aging super304H steel tube with the same P function value, however, the structural damage of the outer side of the serviced steel tube is more severe than that of aging one. Therefore, the artificial aging method in lab is conditionally accepted to simulate the structural damage of serviced steel tube, based on Larson-Miller parameter.

关 键 词：Super304H耐热钢 等温时效 Larson-Miller参数 结构损伤 力学性能 

分 类 号：TG11[金属学及工艺—物理冶金]