反应釜顶盖泄漏分析
|
摘要
某企业一个由Inconel 625合金制成的反应釜使用约10天后在顶盖处发生泄漏。通过宏观检查、断口观察、微观组织分析、成分分析,揭示泄漏反应釜顶盖开裂机制。分析结果表明:裂纹位于顶盖接管处的环焊缝周围,起源于焊接热影响区,属于焊接再热裂纹。同时,反应釜加工过程中未经退火处理,加工残余应力较大,同时工作温度较高,在高温工况与残余应力的综合作用下产生再热裂纹,当裂纹长度穿透反应釜顶盖时,导致泄漏。
An reaction still made of Inconel 625 alloy in an enterprise leaked at the top cap after using for about 10 days.By means of macroscopic examination, fracture observation, microstructure analysis, components analysis,the cracking mechanisms of the top cap of leaky reaction still were revealed. The analysis results show that: the cracks are located around the circumferential welds at the joints between the top cap and tubes, which originates from the HAZ, the cracks belong to the welding reheat crack. Moreover, there is no annealing treatment in production process of the reaction still, the machining residual stress is big and the working temperature is high, the reheat cracks form under the combined action of high temperature working condition and residual stress, the leakage occurs when the cracks penetrate the top cap of reaction still.
An reaction still made of Inconel 625 alloy in an enterprise leaked at the top cap after using for about 10 days.By means of macroscopic examination, fracture observation, microstructure analysis, components analysis,the cracking mechanisms of the top cap of leaky reaction still were revealed. The analysis results show that: the cracks are located around the circumferential welds at the joints between the top cap and tubes, which originates from the HAZ, the cracks belong to the welding reheat crack. Moreover, there is no annealing treatment in production process of the reaction still, the machining residual stress is big and the working temperature is high, the reheat cracks form under the combined action of high temperature working condition and residual stress, the leakage occurs when the cracks penetrate the top cap of reaction still.
引文
[1]余柏健,谭新强,何敏.高压反应釜设计和制造要点[J].中国化工装备,2010,12(3):3-7.
[2]周迎义.蒸压釜的工作特点及失效模式[J].装备制造技术,2012(10):202-204.
[3]薛福连.一起反应釜泄漏事故的教训[J].化工安全与环境,2014(9):7-7.
[4]Shankar V,Rao K B S,Mannan S L.Microstructure and mechanical properties of Inconel 625 superalloy[J].Journal of Nuclear Materials,2001,288(2):222-232.
[5]Albuquerque,Silva C,Normando P G,et al.Thermal aging effects on the microstructure of Nb-bearing nickel based superalloy weld overlays using ultrasound techniques[J].Materials and Design,2012,36:337-347.
[6]Song K H,Nakata K.Effect of precipitation on post-heat-treated Inconel 625 alloy after friction stir welding[J].Materials&Design,2010,31(6):2942-2947.
[7]卫栋,赵强,李昱坤,等.镍基合金油管加工工艺及质量控制研究[J].热加工工艺,2012,41(15):221-223.
[8]张军磊,胡强,魏鹏程,等.Inconel 625合金焊接热裂纹倾向研究[J].材料热处理学报,2016(s1):68-73.
[9]路文江,中尾嘉邦,筱崎贤二.镍基合金焊接热影响区的液化裂纹敏感性[J].焊接学报,1993(3):186-194.
[10]王宝森,吴巍,马天军.热输入对Inconel 625合金热影响区组织的影响[J].焊接技术,2014(11):12-14.
[11]吴俊,张勍.Inconel625镍合金焊接工艺简述[J].石油化工建设,2012(3):69-71.
[12]张文钺.焊接工艺与失效分析[M].北京:机械工业出版社,1989.
[13]陈伯蠡.焊接工程缺欠分析与对策[M].北京:机械工业出版社,1998.
[14]李亚江.焊接组织性能与质量控制[M].北京:化学工业出版社,2005.
[15]Veron P.A case study for reheat crack[J].Materials at High Temperatures,2006,23(3/4):219-223.
[16]姜运建,冯砚厅,郑相锋,等.300MW电站锅炉高温联箱裂纹原因分析[J].热加工工艺,2012,41(1):168-169.
[2]周迎义.蒸压釜的工作特点及失效模式[J].装备制造技术,2012(10):202-204.
[3]薛福连.一起反应釜泄漏事故的教训[J].化工安全与环境,2014(9):7-7.
[4]Shankar V,Rao K B S,Mannan S L.Microstructure and mechanical properties of Inconel 625 superalloy[J].Journal of Nuclear Materials,2001,288(2):222-232.
[5]Albuquerque,Silva C,Normando P G,et al.Thermal aging effects on the microstructure of Nb-bearing nickel based superalloy weld overlays using ultrasound techniques[J].Materials and Design,2012,36:337-347.
[6]Song K H,Nakata K.Effect of precipitation on post-heat-treated Inconel 625 alloy after friction stir welding[J].Materials&Design,2010,31(6):2942-2947.
[7]卫栋,赵强,李昱坤,等.镍基合金油管加工工艺及质量控制研究[J].热加工工艺,2012,41(15):221-223.
[8]张军磊,胡强,魏鹏程,等.Inconel 625合金焊接热裂纹倾向研究[J].材料热处理学报,2016(s1):68-73.
[9]路文江,中尾嘉邦,筱崎贤二.镍基合金焊接热影响区的液化裂纹敏感性[J].焊接学报,1993(3):186-194.
[10]王宝森,吴巍,马天军.热输入对Inconel 625合金热影响区组织的影响[J].焊接技术,2014(11):12-14.
[11]吴俊,张勍.Inconel625镍合金焊接工艺简述[J].石油化工建设,2012(3):69-71.
[12]张文钺.焊接工艺与失效分析[M].北京:机械工业出版社,1989.
[13]陈伯蠡.焊接工程缺欠分析与对策[M].北京:机械工业出版社,1998.
[14]李亚江.焊接组织性能与质量控制[M].北京:化学工业出版社,2005.
[15]Veron P.A case study for reheat crack[J].Materials at High Temperatures,2006,23(3/4):219-223.
[16]姜运建,冯砚厅,郑相锋,等.300MW电站锅炉高温联箱裂纹原因分析[J].热加工工艺,2012,41(1):168-169.