Super304H/T92奥氏体耐热钢摩擦焊焊接接头持久强度及断裂行为
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摘要
本工作利用等温线法对Super304H/T92摩擦焊焊接接头在625℃的持久强度试验结果进行外推,发现焊接接头在625℃、10~5h时的持久强度高于超超临界机组的蒸汽压力参数,说明焊接接头在超超临界环境中服役安全、可靠。持久强度试样为正常断裂,断裂位置在T92侧热影响区。在高应力载荷条件下,蠕变断口为韧窝断裂,以塑性穿晶断裂为主;在低应力载荷条件下,蠕变断口为解理断裂,以蠕变沿晶断裂为主。随着应力载荷的降低和断裂时间的延长,韧窝的数量明显减少,解理面逐渐增加,塑性断裂逐步转变为解理断裂。本研究为Super304H/T92摩擦焊技术的进一步工程应用提供了理论依据和实验支持。
In this paper, the isotherm method was used to extrapolate the results of the creep rupture strength test of the Super304 H/T92 friction welding joint at 625 ℃. Service life prediction curves indicated that Super304 H/T92 weld joints could ensure safe service for duration of 10~5 h at 625 ℃, which is in according with the ultra-supercritical units steam conditions. The rupture process of the specimens is normal, and the fracture location is on the T92 heat affected zone. When the stress is higher, the rupture mode belongs to transcrystalline fracture, and results in forming dimples. When the stress is lower, the rupture mode belongs to creep rupture, and results in cleavage rupture. With the decrease of stress load and the extension of the fracture time, the number of dimples reduced significantly, the cleavage surface increased gradually, and plastic rupture transformed into cleavage rupture. This research provides the theoretical basis and experimental support for the further engineering application of the Super304 H/T92 friction welding technology.
In this paper, the isotherm method was used to extrapolate the results of the creep rupture strength test of the Super304 H/T92 friction welding joint at 625 ℃. Service life prediction curves indicated that Super304 H/T92 weld joints could ensure safe service for duration of 10~5 h at 625 ℃, which is in according with the ultra-supercritical units steam conditions. The rupture process of the specimens is normal, and the fracture location is on the T92 heat affected zone. When the stress is higher, the rupture mode belongs to transcrystalline fracture, and results in forming dimples. When the stress is lower, the rupture mode belongs to creep rupture, and results in cleavage rupture. With the decrease of stress load and the extension of the fracture time, the number of dimples reduced significantly, the cleavage surface increased gradually, and plastic rupture transformed into cleavage rupture. This research provides the theoretical basis and experimental support for the further engineering application of the Super304 H/T92 friction welding technology.
引文
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2 Lou Y M,Zheng H H.Zhe Jiang Electric Power,2015(5),39 (in Chinese).楼玉民,郑宏晔.浙江电力,2015(5),39.
3 Zhang Q,Wang J Q,Chen G H.The Chinese Journal of Nonferrous Me-tals,2013,23(2),396 (in Chinese).张祺,王家庆,陈国宏.中国有色金属学报,2013,23(2),396.
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5 Wu W,Deng F.Journal of Chongqing University of Technology (Natural Science),2017,31(12),72 (in Chinese).吴玮,邓发.重庆理工大学学报(自然科学),2017,31(12),72.
6 Li P,Li J,Li X,et al.Journal of Adhesion Science and Technology,2015,29(12),1246.
7 Li X,Li J,Liao Z,et al.Journal of Adhesion Science and Technology,2018,32(18),1987.
8 Li X,Li J,Liao Z,et al.Materials & Design,2016,99,26.
9 Wang S B,Wu C L,Yuan M.Journal of Nanjing University,2009,43(2),269(in Chinese).王双宝,伍翠兰,元敏.南京大学学报,2009,43(2),2694.
10 Wang Y F,Zheng K Y,Wu Z Y.Journal of Chinese Society of Power Engineering,2010,30(4),245(in Chinese).王延峰,郑开云,吾之英.动力工程学报,2010,30(4),245.
11 Song Y M.Studies on high-temperature microstructures and mechanical properties of the T92/HR3C dissimilar steel weld joints.Master’s Thesis,Hefei University of Technology,China,2012 (in Chinese).宋有明.T92/HR3C接头的髙温组织结构与力学性能的研究.硕士学位论文,合肥工业大学,2012.
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13 Cao J,Gong Y,Yang Z G,et al.International Journal of Pressure Vessels and Piping,2011,88,94.
14 Cao J,Gong Y,Yang Z G.Materials Science and Engineering A,2011,528,6103.
15 Wang L,Liu Z D,Chen P.Press Vessel Technology,2008,25(3),1 (in Chinese).王亮,刘宗德,陈鹏.压力容器,2008,25(3),1.
16 Wang S B.High-temperature resistant property and microstructure characterization of T92 boiler steel.Master’s Thesis,Hunan University,China,2009 (in Chinese).王双宝.T92 锅炉钢抗高温性能及其微观组织表征,硕士学位论文,湖南大学,2009.