长期高温服役乙烯裂解炉管焊接接头损伤分析
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摘要
为了研究长期高温服役后乙烯裂解炉管焊接接头的损伤情况,对服役6a(年)后的Cr35Ni45Nb合金焊接接头的显微组织、高温持久性能、硬度等进行了分析。结果表明:经过长期高温服役后,Cr35Ni45Nb合金焊接接头母材及焊缝区域的原始共晶碳化物发生粗化,形成了连续的网状结构,二次碳化物聚集长大成块状;碳化物M7C3和NbC分别转变为M23C6和G相;焊接接头的高温持久性能下降,硬度升高;熔合线附近区域是整个焊接接头的最薄弱区域;该乙烯裂解炉管服役6a后焊缝热影响区的损伤较为严重,炉管不宜继续使用。
To investigate the damage situation of welding joints of ethylene cracking furnace tubes after long-term service under high temperature,the microstructure,high-temperature endurance property and hardness of welding joints of Cr35 Ni45 Nb alloy after a six-year service was analyzed.The results show that:after a high temperature and long term service,the primary eutectic carbides in base metal and welding seam of welding joints of Cr35 Ni45 Nb alloy coarsened and formed a continuous network structure,and the secondary carbides agglomerated together to blocky shape;the carbides of M7 C3 and NbC transformed into M23 C6 and G phase respectively;the high-temperature endurance property of welding joints decreased and the hardness increased;the area around the fusion line was the weakest zone of the entire welding joints;the damage of the heat affection zone of welding seam of ethylene cracking furnace tubes was comparatively serious after a 6-year service,and the furnace tubes should not be used any more.
To investigate the damage situation of welding joints of ethylene cracking furnace tubes after long-term service under high temperature,the microstructure,high-temperature endurance property and hardness of welding joints of Cr35 Ni45 Nb alloy after a six-year service was analyzed.The results show that:after a high temperature and long term service,the primary eutectic carbides in base metal and welding seam of welding joints of Cr35 Ni45 Nb alloy coarsened and formed a continuous network structure,and the secondary carbides agglomerated together to blocky shape;the carbides of M7 C3 and NbC transformed into M23 C6 and G phase respectively;the high-temperature endurance property of welding joints decreased and the hardness increased;the area around the fusion line was the weakest zone of the entire welding joints;the damage of the heat affection zone of welding seam of ethylene cracking furnace tubes was comparatively serious after a 6-year service,and the furnace tubes should not be used any more.
引文
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[2]刘致远.铝元素对HP40耐热铸造合金组织和性能影响研究[D].兰州:兰州理工大学,2008.
[3]ANDRADE A R,BOLFARINI C,FERREIRA L A M,et al.Titanium micro addition in a centrifugally cast HPNB alloy:High temperature mechanical properties[J].Materials Science and Engineering:A,2015,636:48-52.
[4]ANDRADE A R,BOLFARINI C,FERREIRA L A M,et al.Influence of niobium addition on the high temperature mechanical properties of a centrifugally cast HP alloy[J].Materials Science and Engineering:A,2015,628:176-180.
[5]刘志国.合金元素对耐热钢组织及性能的影响[J].材料开发与应用,1997(1):17-21.
[6]SHEN L M,GONG J M,JIANG Y,et al.Effects of aging treatment on microstructure and mechanical properties of Cr25Ni35Nb and Cr35Ni45Nb furnace tube steel[J].Acta Metallurgica Sinica(English Letters),2011,24(3):235-242.
[7]王子宗,何细藕.乙烯装置裂解技术进展及其国产化历程[J].化工进展,2014,33(1):1-9.
[8]李旺明,刘晴岩,张建华.奥氏体不锈钢管母材和焊缝的显微组织对超声检测的影响[J].理化检验-物理分册,2015,51(1):22-26.
[9]赵金凤,余世杰,袁鹏斌.不锈钢薄板焊接裂纹成因分析[J].理化检验-物理分册,2015,51(2):151-154.
[10]GUGLIELMINO E,PINO R,SERVETTO C,et al.Damage investigation on welded tubes of a reforming furnace[J].Metallurgia Italiana,2015,107(1):53-58.
[11]ALLAHKARAM S R,BORJALI S,KHOSRAVI H.Investigation of weldability and property changes of high pressure heat-resistant cast stainless steel tubes used in pyrolysis furnaces after a five-year service[J].Materials&Design,2012,33:476-484.
[12]SUSTAITA-TORRES I A,HARO-RODRIGUEZ S,GUERRERO-MATA M P,et al.Aging of a cast35Cr-45Ni heat resistant alloy[J].Materials Chemistry and Physics,2012,133(2/3):1018-1023.
[13]宋若康,张麦仓,杜晨阳,等.Cr35Ni45钢高温长期服役过程中的组织演化规律分析[J].稀有金属材料与工程,2014(7):1628-1632.
[14]REIHANI A,HAGHIGHI R D.Failure analysis and weld ability improvement of 35%Cr-45%Ni heat resistant alloy[J].Engineering Failure Analysis,2015,52:97-108.
[15]王成.HP40Nb炉管焊缝组织在时效处理中的碳化物析出研究[J].世界有色金属,2015(8):45-47.
[16]沈利民,巩建鸣,姜勇,等.时效时间对Cr35Ni45Nb离心铸造奥氏体钢力学性能与微观组织的影响[J].南京工业大学学报(自然科学版),2011,33(2):28-32.
[17]KONDRAT’EV S Y,KRAPOSHIN V S,ANASTASIADI G P,et al.Experimental observation and crystallographic description of M7C3carbide transformation in Fe-Cr-Ni-C HP type alloy[J].Acta Materialia,2015,100:275-281.
[18]巩建鸣,潘文越.HK40炉管焊缝抗蠕变裂纹扩展能力的试验[J].南京化工大学学报(自然科学版),1998,20(4):60-64.
[19]巩建鸣,涂善东,凌祥,等.焊接对HK40高温炉管的蠕变损伤与断裂的影响[J].材料工程,2000(11):9-12.
[20]SHINOZAKI K,KUROKI H,NAKAO Y,et al.Deterioration of weldability of long-term aged HP heat-resistant cast steel containing Nb,Mo,and W[J].Welding International,1999,13(1):39-48.
[21]MAY I L,SILVEIRA T L D,VIANNA C H.Criteria for the evaluation of damage and remaining life in reformer furnace tubes[J].International Journal of Pressure Vessels and Piping,1996,66(1/3):233-241.