龙会国,谢国胜,龙毅,何朋非

• 1:湖南省湘电锅炉压力容器检验中心有限公司
• 2:国网湖南省电力公司电力科学研究院

摘要(Abstract)：

通过对在役不同外径蠕变应变状态T91管取样,采用光镜、扫描电镜及力学性能试验分析T91管在长期服役中的不同外径蠕变应变状态下组织、力学性能演变规律,研究外径蠕变应变对其组织及室温力学性能影响。结果表明,随着外径蠕变应变的增加,马氏体板条特征逐渐消失,M23C6型碳化物粗化及沿晶界析出、聚集与粗化,原奥氏体晶界和亚晶界逐渐清晰、粗化;室温屈服强度、抗拉强度随外径蠕变应变增加而降低,而断后伸长率随外径蠕变应变的增加遵循先增后降的趋势。沉淀相M23C6型碳化物粗化及所导致的板条亚结构退化、碳化物沿原奥氏体晶界和亚晶界析出及所导致的晶界变宽是T91管高温运行中外径蠕变造成强度降低和最终失效的主要原因。

关键词(KeyWords)： T91钢;蠕变;沉淀相;力学性能;组织退化

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 龙会国,谢国胜,龙毅,何朋非

DOI: 10.13289/j.issn.1009-6264.2015.02.027

参考文献(References)：

• [1]赵杰,李东明,方园园.T91/P91钢持久性能的统计分析及可靠性预测[J].金属学报,2009,45(7):835-839.ZHAO Jie,LI Dong-ming,FANG Yuan-yuan.Statically analysis and reliability prediction of creep rupture property for T91/P91 steel[J].Acta Merallurgica Sinica,2009,45(7):835-839.
• [2]谢国胜,龙会国,龙毅.9Cr1Mo VNb钢蒸汽侧氧化膜形态及其形成机理[J].中国电力,2013,46(1):54-58.XIE Guo-sheng,LONG Hui-guo,LONG Yi.Study on steam-side oxidation mechanism and characterization of oxide scales grown on T91 tubes[J].Electric Power,2013,46(1):54-58.
• [3]史志刚,候安柱,李益民.T91运行过程中力学性能和微观组织的变化[J].动力工程,2005,25(5):742-746.SHI Zhi-gang,HOU An-zhu,LI Yi-min.Changes in mechanical properties and microstructure of T91 steel during service[J].Power Engineering,2005,25(5):742-746.
• [4]于在松,周荣灿,王弘喆,等.高温服役138000h后T91管显微组织结构分析[J].热力发电,2008,37(12):20-25.YU Zai-song,ZHOU Rong-can,WANG Hong-zhe,et al.Microstructure analysis of T91 steel after 130000 h in service under high temperature[J].Thermal Power Generation,2008,37(12):20-25.
• [5]张道刚,冀彦昭,柯浩.T91管高温再热器管材料组织力学性能变化[J].热力发电,2008,37(6):69-72.ZHANG Dao-gang,JI Yan-zhao,KE Hao.Mechanical performance varation with tube material’s quality and composition of the reheaters made from T91[J].Thermal Power Generation,2008,37(6):69-72.
• [6]史志刚,候安柱,李益民.T91钢长期运行过程中微观组织老化研究[J].热力发电,2006(4):54-58.SHI Zhi-gang,HOU An-zhu,LI Yi-min.Changes in microstructure of T91 steel during service[J].Thermal Power Generation,2006(4):54-58.
• [7]王学,张珣,占良飞,等.T91钢组织退化行为及对高温持久强度的影响[J].中国电机工程学报,2012,32(29):137-142.WANG Xue,ZHANG Xun,ZHAN Liang-fei,et al.Microstructure degradation behavior and its influence on high temperature stress rupture limit of T91 steel[J].Proceedings of the CSEE,2012,32(29):137-142.
• [8]DL/T 438-20049,火力发电厂金属技术监督规程[S].2009.DL/T 438-2009,The technical supervision codes for metal in fossil-fuel power plant[S].2009.
• [9]刘福广,李太江,梁军,等.高温时效对P92钢焊接接头显微组织和力学性能的影响[J].中国电机工程学报,2011,31(14):121-126.LIU Fu-guang,LI Tai-jiang,LIANG Jun,et al.Effect of thermal aging on microstructure and mechanical properties of P92 steel weld joints[J].Proceedings of the CSEE,2011,31(14):121-126.
• [10]Maruyama K,Sawada K,Koike J.Strengthening mechanisms of creep resistant tempered martensitic steel[J].ISIJ International,2001,41(6):641-653.
• [11]Polcik P.Modellierung des Verformungsverhaltens Derwarmfesten 9~12%Chromstahle im Temperaturbereich von 550~600℃[M].Shaker Verlag,Aachen,1999:92-101.
• [12]赵君,钟万里,王伟,等.服役T91钢中碳化物的萃取工艺与演变规律[J].材料热处理学报,2013,34(1):102-107.ZHAO Qun,ZHONG Wang-li,WANG Wei.et al.Extraction technique and evolution of carbides in serviced T91 steel[J].Transactions of Materials and Heat Treatment,2013,34(1):102-107.
• [13]Hald J,Korcakova L.Precipitate stability in creepresistant ferritic steels experimental investigations and modelling[J].ISIJ International,2003,43(3):420-427.
• [14]Abe F,Tabuchi M.Microstructure and creep strength of welds in advanced ferritic power plant steels[J].Science and Technology of Welding and Joining,2004,9(1):22-30.
• [15]Orlova A,Bursik J,Kueharova K,et al.Microstructural development during high temperature creep of 9%Cr steel[J].Materials Science and Engineering A,1998,245:39-48.

文章评论(Comment)：