服役态不同晶粒度TP347HFG钢管的显微组织与力学性能的对比  被引量:5

Comparison of microstructure and mechanical properties of in-service TP347HFG steel tubes with different grain sizes

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作  者:程翔 鲍峥 王若民 缪春辉 陈国宏 汤文明[2] CHENG Xiang;BAO Zheng;WANG Ruo-min;MIAO Chun-hui;CHEN Guo-hong;TANG Wen-ming(Anhui Xinli Electric Technology Consulting Co Ltd,Hefei 230601,China;School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China;Electric Power Research Institute,Anhui Electric Power Co Ltd,State Grid,Hefei 230601,China)

机构地区:[1]安徽新力电业科技咨询有限责任公司,安徽合肥230601 [2]合肥工业大学材料科学与工程学院,安徽合肥230009 [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:《材料热处理学报》2024年第1期148-156,共9页Transactions of Materials and Heat Treatment

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:采用扫描电镜、X射线衍射和电子万能试验机等研究了奥氏体晶粒度分别为7级(粗晶)与10级(细晶)的TP347HFG高温再热器管在600℃下服役约5万小时后的显微组织与力学性能。结果表明:服役态两种不同晶粒度的TP347HFG钢管的组织都发生了不同程度的老化,粗晶管的老化程度小于细晶管。粗晶管的奥氏体晶粒尺寸大,除含有较多粗大的初生MX相颗粒外,还在奥氏体晶内析出纳米级次生MX颗粒,同时在奥氏体晶界析出M_(23) C_(6)相颗粒。相反,虽然细晶管的奥氏体晶粒细小,但组织老化更严重,析出的第二相颗粒数量多,且以M_(23) C_(6)相颗粒为主,次生MX颗粒较少,无初生MX相颗粒。细晶管的室温及高温拉伸强度均高于粗晶管,但其断后伸长率低,屈强比较高,塑性变形能力较低。粗、细晶TP347HFG钢管在高温下的屈强比差异更大,粗晶管具有更高的服役安全性。Microstructure and mechanical properties of TP347HFG high-temperature reheater tubes with austenite grain sizes of grade 7(coarse-grain)and grade 10(fine-grain)after about 50000 h of service at 600℃were studied by means of scanning electron microscopy,X-ray diffraction and electronic universal testing machine.The results show that the microstructure of the in-service TP347HFG steel tubes with two different grain sizes has undergone varying degrees of coarsening,and the coarsening degree of the coarse-grain tube is lower than that of the fine-grain tube.The coarse-grain tube has a large austenite grain size,and contains a large number of coarse primary MX phase particles,nanoscale secondary MX particles precipitated within the austenite grains,and M_(23) C_(6) phase particles precipitated at the austenite grain boundaries.On the contrary,although the austenite grains in the fine-grain tube are small,the microstructure coarsens more severely,with a large number of precipitated second phase particles,mainly M_(23) C_(6) phase particles,fewer secondary MX particles,and no primary MX phase particles.The room temperature and high temperature tensile strength and yield strengh of the fine-grain tube are higher than that of the coarse-grain tube,but its elongation and the plastic deformation ability is lower.The difference in yield strength ratio between coarse-grain and fine-grain TP347HFG steel tubes at high temperatures is greater, and the coarse-grain tube has higher service safety.

关 键 词:TP347HFG耐热钢管 晶粒度 第二相 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]

 

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