异种钢焊接接头熔合区马氏体带的化学成分和组织结构

The Chemical Composition and Microstructures of the Fusion Zone of Dissimilar Steel Welded Joint

借助光学及电子显微镜，对不锈钢焊条焊接低合金高强钢的异种钢接头熔合区的马氏体带，进行了试验研究。结果表明，马氏体带含大量位错形马氏体、少量的孪晶形马氏体、残余奥氏体以及Ｃｒ２３Ｃ６ 化合物；熔合区化学成分分布特征缘于不充分的扩散传质；马氏体的数量、亚结构特征以及Ｃｒ２３ Ｃ６ 化合物的形成取决于母材和填充金属的化学成分。

By optical and electronic microanalysis methods,the martensite brittle layer of the dissimilar steel welded joint fusion zone has been explored.The results show:there are a lot of dislocation martensites,a little of twincrystal martensites,remnant austenites and Cr 23 C 6 compounds.The unsufficient diffusion is the reason of the chemical composition distribution of the fusion zone.The amount of martensites and the formation of microstructure are mainly decided by the chemical composition of the base metal and the filler metal. 