TP310HNbN钢/617焊材焊接接头的显微组织和力学性能
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摘要
通过力学性能试验,光学金相显微镜和透射电子显微镜,研究了TP310HNbN钢/617焊材焊接接头的显微组织和力学性能。研究结果表明:经650℃时效处理,TP310HNbN钢/617焊材焊接接头的室温抗拉强度和硬度先增加后趋于稳定,焊缝区的缺口冲击性能下降,但时效7000 h,缺口的冲击吸收能量仍可以达到40 J以上; 617焊材焊接接头的高温持久强度与配套焊材接头接近,可以达到配套焊材接头的92%; 617焊材焊缝时效后的强度主要源于固溶强化和细小γ'相的弥散强化作用,连续分布于晶界的M_(23)C_6相、M_6C相及胞状亚晶晶界附近短棒状δ相的密集分布则会造成的焊缝缺口冲击性能下降。
Microstructure and mechanical properties of TP310 HNbN steel/617 filler metal welded joints were studied by means of mechanical properties tests,optical microscope and transmission electron microscope. Results show that the tensile strength and hardness of the welded joints using 617 filler metal increase first and tend to be stable after long term thermal aging at 650 ℃,and the notched impact property of the welded joints decreases,but the impact absorbed energy of the notch reaches more than 40 J after long aging for 7000 h. The creep rupture strength of welded joints using 617 filler can reach 92% of that using T-HR3 C filler metal. Maintenance of creep rupture strength of the 617 filler metal welded joints after long term thermal aging is mainly due to the effect of solid solution strengthening and dispersion strengthening of fine γ' phase,and the continuously distribution of M_(23) C_6 and M_6 C phases of in the grain boundary and the dense distribution of short rod-like δ phase near the cellular sub-grain boundary will result in the decrease of the notched impact property of the welded joints.
Microstructure and mechanical properties of TP310 HNbN steel/617 filler metal welded joints were studied by means of mechanical properties tests,optical microscope and transmission electron microscope. Results show that the tensile strength and hardness of the welded joints using 617 filler metal increase first and tend to be stable after long term thermal aging at 650 ℃,and the notched impact property of the welded joints decreases,but the impact absorbed energy of the notch reaches more than 40 J after long aging for 7000 h. The creep rupture strength of welded joints using 617 filler can reach 92% of that using T-HR3 C filler metal. Maintenance of creep rupture strength of the 617 filler metal welded joints after long term thermal aging is mainly due to the effect of solid solution strengthening and dispersion strengthening of fine γ' phase,and the continuously distribution of M_(23) C_6 and M_6 C phases of in the grain boundary and the dense distribution of short rod-like δ phase near the cellular sub-grain boundary will result in the decrease of the notched impact property of the welded joints.
引文
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[12]方圆圆,赵杰,李娜. HR3C钢高温时效过程中的析出相[J].金属学报,2010,46(7):844-849.Fang Yuanyuan,Zhao Jie,Li Na. Precipitation in HR3C steel aged at high temperature[J]. Acta Metallurgica Sinica,2010,46(7):844-849.
[13]李太江,刘福广,范长信,等.超超临界锅炉用新型奥氏体耐热钢HR3C的高温时效脆化研究[J].热加工工艺,2010,39(14):43-36.Li Taijiang,Liu Fuguang,Fan Changxin,et al. Study on aging embrittlement of new type austenitic heat resistant steel HR3 C used in USC boiler[J]. Hot Working Technology,2010,39(14):43-36.
[2]李太江,刘福广,陈伟武,等. HR3C钢焊接接头高温时效后的显微组织和力学性能[J].金属热处理,2012,37(8):16-19.Li Taijiang,Liu Fuguang,Chen Weiwu,et al. Microstructure and mechanical properties of HR3C steel weld joints aged at high temperature[J]. Heat Treatment of Metals,2012,37(8):16-19.
[3]秦成鹏,王亮,李良,等.超超临界1000 MW机组锅炉末级再热器爆管原因分析[J].热力发电,2012,41(10):69-72.Qin Chengpeng,Wang Liang,Li Liang,et al. Tube burst of final reheater on boiler of 1000 MW ultra supercritical unit:cause analysis[J]. Thermal Power Generation,2012,41(10):69-72.
[4]高延中,邢辉,陈稳定,等. T91/HR3C异种钢焊接接头裂纹原因分析[J].热力发电,2013,42(1):106-108.Gao Yanzhong,Xing Hui,Chen Wending,et al. reason analysis on crack appeared in welded joints of dissimilar heat-resistant steel T91/HR3C[J]. Thermal Power Generation,2013,42(1):106-108.
[5]Cao J,Gong Y,Yang Z G,et al. Creep fracture behavior of dissimilar weld joints between T92 martensitic and HR3C austenitic steels[J].International journal of Pressure Vessels and Piping,2011,88(2/3):94-98.
[6]刘福广,李太江,刘立营,等. S31042钢使用82型焊材焊接接头的显微组织和力学性能实验研究[J].焊接学报,2017,38(12):119-124.Liu Fuguang, Li Taijiang, Liu Liying, et al. Microstructure and mechanical properties of S31042 steel welded joints with 82 alloy filler metal[J]. Transactions of The China Welding Institution,2017,38(12):119-124.
[7]刘福广,李太江,陈伟武,等. S30432钢不同焊材焊接接头组织性能[J].金属热处理,2012,37(9):45-50.Liu Fuguang,Li Taijiang,Chen Weiwu,et al. Microstructure and mechanical properties of S30432 steel welded joint using different filler metal[J]. Heat Treatment of Metals,2012,37(9):45-50.
[8]江河,董建新,张麦仓,等. 700℃超超临界用锅炉管材617合金研究进展[J].世界钢铁,2014,14(3):26-39.Jiang He,Dong Jianxin,Zhang Maicang,et al. A review of the study on alloy 617 for 700℃ultra supercritical power plants[J]. World Iron&Steel,2014,14(3):26-39.
[9]杨权,谭舒平. 617合金的组织稳定性[J].钢铁,2014,49(2):60-64.Yang Quan,Tan Shuping. Analysis for the microstructure stability of alloy 617[J]. Iron&Steel,2014,49(2):60-64.
[10]冶军.美国镍基高温合金[M].北京:科学出版社,1978.
[11]陈国宏,潘家栋,王家庆,等. 650℃时效HR3C耐热钢的显微组织与高温拉伸性能[J].材料热处理学报,2014,35(2):104-109.Chen Guohong,Pan Jiadong,Wang Jiaqing,et al. Microstructure and high-temperature tensile properties of HR3C heat-resistant steel after annealing at 650℃[J]. Transactions of Materials and Heat Treatment,2014,35(2):104-109.
[12]方圆圆,赵杰,李娜. HR3C钢高温时效过程中的析出相[J].金属学报,2010,46(7):844-849.Fang Yuanyuan,Zhao Jie,Li Na. Precipitation in HR3C steel aged at high temperature[J]. Acta Metallurgica Sinica,2010,46(7):844-849.
[13]李太江,刘福广,范长信,等.超超临界锅炉用新型奥氏体耐热钢HR3C的高温时效脆化研究[J].热加工工艺,2010,39(14):43-36.Li Taijiang,Liu Fuguang,Fan Changxin,et al. Study on aging embrittlement of new type austenitic heat resistant steel HR3 C used in USC boiler[J]. Hot Working Technology,2010,39(14):43-36.