残余应力对焊接结构腐蚀行为的影响规律研究
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摘要
以X65钢焊接试件在自然海水中的腐蚀行为为研究对象,通过焊接残余应力检测、腐蚀形貌观察和金相分析等方法。研究残余应力对焊接结构腐蚀行为的影响规律。结果表明:振动消除应力后,焊接结构表面腐蚀行为的主要影响因素是局部腐蚀电偶,其腐蚀行为以点蚀为主;未经振动消除应力处理时,影响结构表面腐蚀行为的主要因素为残余应力,焊接结构腐蚀行为以均匀腐蚀为主;焊接结构中的残余应力会加重熔合线处的腐蚀程度,金属损失量增多,是焊接结构成为应力腐蚀开裂、失效高发区的重要原因。
The experimental study on corrosion behavior of X65 steel welded specimens immersing in seawater was performed,aiming to research the influence law of residual stress on welded structure corrosion behavior,some methods were used including welding residual stress testing,corrosion morphology observation and metallographic analysis et al. The results show that local galvanic corrosion is the main influence factor of welded structure surface corrosion behavior after vibration stress relief treatment,pitting corrosion is the main corrosion behavior of welded structure. The residual stress is the main factor that affects the surface corrosion behavior of the structure without vibration,and the corrosion behavior of welding structure is mainly uniform corrosion. The residual stress in the welding structure can aggravate the corrosion degree of the fusion line and increase the loss of metal,which is the important reason for the welding structure to become the stress corrosion cracking and the failure of high frequency zone.
The experimental study on corrosion behavior of X65 steel welded specimens immersing in seawater was performed,aiming to research the influence law of residual stress on welded structure corrosion behavior,some methods were used including welding residual stress testing,corrosion morphology observation and metallographic analysis et al. The results show that local galvanic corrosion is the main influence factor of welded structure surface corrosion behavior after vibration stress relief treatment,pitting corrosion is the main corrosion behavior of welded structure. The residual stress is the main factor that affects the surface corrosion behavior of the structure without vibration,and the corrosion behavior of welding structure is mainly uniform corrosion. The residual stress in the welding structure can aggravate the corrosion degree of the fusion line and increase the loss of metal,which is the important reason for the welding structure to become the stress corrosion cracking and the failure of high frequency zone.
引文
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[3]Nobutomo N,Kazuhiro A,Takashi T,et al.Inspection of stress corrosion cracking in welded stainless steel pipe using point-focusing electromagnetic-acoustic transducer[J].Nondestructive Testing and Evaluation International,2016(83):88-93.
[4]PoklyatskiiАG,Fedorchuk VЕ,Yavorskaya M R.Stresscorrosion cracking resistance of AMG-5M alloy obtained by nonconsumable-electrode argon-arc welding and friction stir welding[J].Materials Science,2016,51(5):682-690.
[5]RAFFI M,MADHUSUDHAN R,SRINIVASA R.Microstructure and pitting corrosion of shielded metal arc welded high nitrogen stainless steel[J].Defence Technology,2015:1-7.
[6]Aboulfazl M,Iman D.Microstructure and corrosion resistance of dissimilar weld-joints between duplex stainless steel2205 and austenitic stainless steel 316L[J].Journal of Materials Science and Technology,2015,31(6):1-19.
[7]Cai C,Li L Q,Tao W,et al.Weld bead size,microstructure and corrosion behavior of zirconium alloys joints welded by pulsed laser spot welding[J].Journal of Materials Engineering and Performance,2016,25(9):3783-3792.
[8]肖纪美.材料腐蚀学原理[M].北京:化学工业出版社,2002.
[9]任颂赞.金相分析原理及技术[M].上海:上海科学技术文献出版社,2012.
[10]Neves F O,Braga D U,Silva A S C.Study of residual stresses on cold-forming metals using stress corrosion[J].Materials and Manufacturing Processes,2015(30):1278-1282.