摘要
采用恒电位阳极极化加速腐蚀试验方法研究了不同热处理工艺对高频直缝电阻焊(ERW)钢管焊接区沟槽腐蚀敏感性的影响,通过电化学测试、显微组织分析、残余应力测试和微区成分分析探讨了沟槽腐蚀的成因和机制。结果表明,ERW焊缝区、热影响区与母材的组织和成分分布的差异是产生沟槽腐蚀的主要原因,而残余应力不是重要影响因素。焊后单纯回火处理不能降低ERW焊管焊缝区沟槽腐蚀敏感性,焊后调质处理和单纯淬火处理均可显著降低ERW焊管焊接区的沟槽腐蚀敏感性。
The constant potential anodic polarization method was employed to investigate the grooving corrosion（GC） susceptibility of electric resistance welded（ERW） pipes of 20 steel after different heat-treatment.The mechanisms of grooving corrosion and the factors influencing its susceptibility were examined by means of electrochemical measurement,microstructure observation,residual stress measurement and micro-region composition analysis.The results show that the grooving corrosion susceptibility of electric resistance welded pipes of 20 steel is high,which is mainly due to the obvious difference of microstructure and composition in the welded seam,heat affected zone and base metal.The residual stress in the welded region is not a dominating factor influencing GC of ERW pipe.The tempering after welding cannot reduce the GC susceptibility of ERW pipes of 20 steel.Both the quenching plus high temperature tempering and single quenching can significantly reduce the GC susceptibility of the ERW pipes.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2011年第2期48-53,60,共7页
Transactions of Materials and Heat Treatment
基金
国家"863"计划项目(2006AA06A106)
关键词
沟槽腐蚀
热处理
电阻焊缝
显微组织
残余应力
grooving corrosion
heat-treatment
electric resistance welded seam
microstructure
residual stress
