焊接工艺对Q345R的硫化物应力腐蚀敏感性的影响  

Effect of Welding Process on the Sulfide Stress Corrosion Susceptibility of Q345R

作　　者：杨全毅 张朝阳 刘猛 刘贤斌[3,4] 韩恩厚 YANG Quan-yi;ZHANG Zhao-yang;LIU Meng;LIU Xian-bin;HAN En-hou(China Petroleum Engineering&Construction Co.,Ltd.,North Company,Renqiu 062552,China;Pipe China R&D Center,Langfang 065000,China;Laboratory for Corrosion and Safety Assessment of Petrochemical Materials Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;Sanyi Heavy Equipment Co.,Ltd.,Shenyang 110027,China)

机构地区：[1]中国石油工程建设有限公司华北分公司,河北任丘062552 [2]国家管网集团北方管道有限责任公司管道科技研究中心,河北廊坊065000 [3]中国科学院金属研究所,辽宁沈阳110016 [4]三一重型装备有限公司,辽宁沈阳110027

出　　处：《材料保护》2021年第4期22-26,共5页Materials Protection

基　　金：国家自然科学基金(51501199)资助。

摘　　要：为了探讨和分析焊接工艺对Q345R的硫化物应力腐蚀敏感性影响成因,在饱和硫化氢NACE A溶液中对手工焊接和氩弧焊打底后手工焊接的Q345R材料进行硫化物应力腐蚀开裂敏感性测试评价,采用SEM和硬度计研究分析了2种焊接工艺Q345R组织和性能的变化。试验结果表明:焊接工艺对Q345R钢的硫化物应力腐蚀开裂敏感性的差异源于工艺差异造成起焊区域形成魏氏体组织与硬度的差异,焊接时引入的焊渣易成为裂纹源,加速了焊接区域在饱和硫化氢NACE A溶液中的敏感性,使之以沿晶开裂方式断裂。In order to discuss and analyze the influence of welding process on Q345 R sulfide stress corrosion sensitivity,the sulfide stress corrosion cracking susceptibility of Q345 R welded by manual welding and argon arc welding processes was tested and evaluated in NACE A solution with saturated H2S.The microstructure and mechanical properties of Q345 R welded by the two welding processes were analyzed by SEM and vickers hardness tester.Results showed that the difference of sulfide stress corrosion cracking sensitivity of Q345 R steel resulted from the difference of welding process,which made the difference of Widmanstatten structure and hardness in the starting welding area.Additionally,the welding slag was easy to be introduced during welding process and become the crack source,which accelerated the sensitivity of welding area in NACE A solution saturated by H2S and caused intergranular cracking.

关 键 词：Q345R 焊接工艺 应力腐蚀 硫化氢腐蚀 硬度 

分 类 号：O646.6[理学—物理化学]