不同服役期TP347HFG钢管显微组织与力学性能的对比  

Comparison on microstructure and mechanical properties of TP347HFG steel tubes served for different terms

作　　者：鲍峥 程翔 王若民 缪春辉 陈国宏 汤文明[1] Bao Zheng;Cheng Xiang;Wang Ruomin;Miao Chunhui;Chen Guohong;Tang Wenming(School of Materials Science and Engineering,Hefei University of Technology,Hefei Anhui 230009,China;Anhui Xinli Electric Technology Consulting Co.,Ltd.,Hefei Anhui 230601,China;Electric Power Research Institute,State Grid Anhui Electric Power Co.,Ltd.,Hefei Anhui 230601,China)

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009 [2]安徽新力电业科技咨询有限责任公司,安徽合肥230601 [3]国网安徽省电力有限公司电力科学研究院,安徽合肥230601

出　　处：《金属热处理》2024年第5期10-16,共7页Heat Treatment of Metals

基　　金：安徽新力电业科技咨询有限责任公司科技项目(2022咨-KJ-02)。

摘　　要：针对供货态以及在600℃服役约50000 h、110000 h的TP347HFG钢高温再热器管,开展显微组织与力学性能的对比研究。结果表明,服役50000 h的管样中奥氏体晶粒正常长大,且伴随着细小M_(23)C_(6)颗粒的析出,第二相弥散强化效应增加,相比于供货态TP347HFG钢管,具有更高的屈服强度。但服役110000 h的TP347HFG钢管样显微组织老化严重,部分奥氏体晶粒异常长大,且粗大M_(23)C_(6)颗粒对晶界的割裂作用增大,导致其室温、高温力学性能普遍降低。此外,随着服役时间的延长,TP347HFG钢管样的冲击性能不断降低,断口塑性变形特征不断弱化,组织老化对服役态试样力学性能的影响愈加明显。Microstructure and mechanical properties of the TP347HFG high-temperature reheater steel tubes were studied comparatively in supplied state and that serviced for about 50000 h and 110000 h at 600℃,respectively.The results show that for the TP347HFG steel tube serviced for 50000 h,normal austenite grain growth takes place,and the accompanying precipitation of the tiny M_(23)C_(6) particles leads to the increase of dispersion strengthening effect,resulting in the yield strength higher than that of the steel tube in supplied state.However,the microstructure of the TP347HFG steel tube serviced for 110000 h is severely degenerated with some abnormally growing austenite grains.Moreover,the coarse M_(23)C_(6) particles have an increased separation effect on grain boundaries,resulting in a significant decrease of mechanical properties at room temperature and high temperature.Moreover,with the service time increasing,the impact properties and plastic deformation characteristics at fracture of the TP347HFG steel tube are continuously degraded,and the effect of microstructure aging on mechanical properties of the TP347HFG steel tubes in service for different terms turns to be more pronounced.

关 键 词：TP347HFG耐热钢管 长期服役 显微组织 力学性能 

分 类 号：TG142.7[一般工业技术—材料科学与工程]