论文部分内容阅读
采用熔化极富氩气体保护焊进行S450EW同种金属焊接,并利用电化学测试研究了焊接接头不同区域的耐蚀性能.结果表明,S450EW焊接接头母材区和焊缝区显微组织均为粒状贝氏体,热影响区为铁素体和珠光体的混合组织.焊缝区主要发生均匀腐蚀,但母材区和热影响区以局部腐蚀为主,而且热影响区腐蚀程度更深.焊丝中较高的Ni含量使得焊缝区抗大气腐蚀性能较好,而热影响区铁素体和珠光体两相组织导致其腐蚀速率较高.“,”The weld joint of S450EW steel was prepared by metal active gas arc (MAG) welding.The corrosion behavior of different zones of the welded joint was studied via electrochemical test and scanning electron microscope (SEM).The results showed that the microstructures were mainly composed of granular bainite of the base metal zone and weld zone,while the microstructure of the heat affected zone was composed of a mixture of ferrite and pearlite.Uniform corrosion was the typical corrosion pattern in the weld zone,and local corrosion occurred in the base metal zone and heat affected zone.Besides,severer local corrosion was observed in the heat affected zone.The better corrosion resistance of the weld zone may ascribed to the effect of high Ni content of the welding rod,while the high corrosion rate of the heat affected zone may be due to the dual phase microstructure of ferrite and pearlite.