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本文探讨了γ+α异种钢焊接接头的区域划分,熔合区的形成及化学不均匀性,并用氚示踪的自射线照相方法直接观察了异种钢接头的氢分布。结果表明,W.F.Savage关于焊接接头区域划分的新方案也基本适合于异种钢接头;熔合区的形成经历了局部熔化、完全熔化、元素扩散和凝固结晶四个阶段;用该模型计算镍、铬等置换元素在熔合区的理论分布与实测结果比较一致。碳、氢等间隙元素的扩散分布受到活度和陷阱的强烈影响,碳富集在焊缝熔合区,氢(氚)强烈偏聚在实际熔合线,母材熔合区则同时发生贫碳和贫氢现象。氚显示的实际熔合线是宽约2—3μm的厚边界层。
In this paper, the area division, fusion zone formation and chemical heterogeneity of γ + α dissimilar steel welded joints were discussed. The hydrogen distribution of dissimilar steel joints was directly observed by tritium self-radiography. The results show that WFSavage ’s new scheme of welding joint zone division is basically suitable for dissimilar steel joints. The formation of fusion zone has undergone four stages of partial melting, complete melting, elemental diffusion and solidification and crystallization. Using this model to calculate nickel, chromium and so on The theoretical distribution of displacement elements in the fusion zone is consistent with the measured results. The diffusion distribution of carbon, hydrogen and other interstitial elements is strongly influenced by the activity and traps. Carbon enrichment strongly segregates towards the actual fusion line in the weld zone and hydrogen (tritium), while the base metal fusion zone simultaneously produces lean and lean Hydrogen phenomenon. The actual fusion line shown by tritium is a thick boundary layer about 2-3 μm wide.