摘要
在服役约7.8万h的600MW超临界锅炉末级再热器不同位置截取T23、T91和TP347H钢管试样,分别进行显微组织和常温、高温拉伸性能分析,对比研究了显微组织和拉伸性能的劣化程度。结果表明:T23、TP347H和T91钢管试样的组织均呈现明显的老化特征,晶界处分别析出M6C碳化物、M23C6碳化物和Laves相,显微组织老化级别分别为4级、3.5级和4级;T23钢管试样的常温和高温拉伸性能均呈现严重的劣化倾向,均不满足标准要求,T91钢管试样的抗拉强度明显下降,TP347H钢管试样的拉伸性能则满足标准要求;在高温状态下,TP347H钢管试样呈现良好的强度和结构安全性,但延展性明显降低。
T23, T91 and TP347 H steel tube samples were taken at different positions of the final boiler reheaterof a 600 MW supercritical boiler in service of about 7.8×104 h. Microstructures and tensile properties at room temperatu re and elevated temperature of these samples were analyzed, and the deterioration degrees of the microstruc tureand tensile properties were studied and compared. The results show that the microstructures of T23, TP347 H,T91 steel tube samples presented obvious degradationcharacteristics with M6 C carbide,M23 C6 carbide and Lave sphase precipitated on grain boundaries, and the microstructure degradation grades were grade 4, grade 3.5 andgrade 4, respectively. The tensile properties of T23 steel tube samples at room temperature and elevated temperat ure showed serious deterioration tendency, and did not meet the sta ndard requirements. The tensile stre ngthof T91 steel tube samples decreased significantly. The tensile propertiesof TP347 H steel tube samples met thes tandard requirements. Under elevated temperature conditions, TP347 H steel tube samples had good strength andstructu ral safety, but ductility was significantly reduced.
作者
郭赉佳
谷树超
段鹏
丁宪飞
王松
刘宇哲
GUO Laijia;GU Shuchao;DUAN Peng;DING Xianfei;WANG Song;LIU Yuzhe(Shanghai Caojing Cogeneration Co.Ltd.Shanghai 201507,China;Shanghai Minghua Eletrie Power Science&.Technology Co.Ltd,Shanghai 200090,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2020年第9期56-61,66,共7页
Materials For Mechanical Engineering
