摘要
不锈层焊缝及熔合区组织对奥氏体(A)/珠光体(P)异种钢复合管焊接接头性能有重要影响。采用E309L型超低碳奥氏体不锈钢焊条的焊条电弧焊(SMAW,shieldedmetal arc welding)方法制备了0Cr18Ni9/20复合管单层焊和多层焊接头,并应用光学金相、能谱(EDS,energy dispersive spectrum)成分及线扫描、扫描电镜(SEM,scanning electronmicroscope)、X射线衍射以及显微硬度等方法对焊接接头进行了对比分析研究。结果表明,基层焊缝的再热作用可以使不锈层焊缝的δ-Fe相细化,熔合区合金元素分布更加均匀,且无Cr23C6相析出,对接头性能产生有利影响。
Microstructures of transition weld and melted zone has the important effects on properties of austenitic/pearlitic dissimilar steel clad pipe welded joint.Single-pass and multi-passes welded joints of 0Cr18Ni9/20 clad pipe were prepared by the use of shielded metal arc welding(SMAW) and E309L super-low carbon austenitic stainless steel electrode.Studies on the welded joint were made by means of optical metaloscopy,energy dispersive spectrum,scanning electron microscope,X-ray diffraction and microhardness analysis.The results indicated that re-heating of cover pass weld can decrease the size and the content of δ-ferrite in transition weld,and the morphology of δferrite in transition weld turns from the vermicular type to the granular type. The chemical compositions of melted zone between transition weld and 0Cr18Ni9 base metal become more uniform.And there was no precipitation of Cr23C6 carbides in transition weld after re-heating.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2007年第9期51-54,共4页
Transactions of The China Welding Institution
关键词
多层焊
复合管
超低碳奥氏体不锈钢焊条
焊条电弧焊
multi-passes welding
clad pipe
super-low carbon austenitic stainless steel electrode
shielded metal arc welding
