Tungsten Insert Gas( TIG) welding of ODS alloy MGH956 with two kinds of different filler materials ( basic filler and Al-Fe2 O3 filler ) respectively under identical conditions were performed. The chemical composition of the basic filler is similar to that of base metal, while the alloy elements Al, Fe2 O3 are added to the Al-Fe2 O3 filler. The effect of in-situ reaction on microstructure and mechanical properties of TIG welding for ODS alloy were studied, and the results showed that the number of pores in the weld reduced significantly, and the size decreased in the TIG welding with the Al-Fe2O3 filler. New strengthened phase particles such as Al2O3, TiC and YAlO3 were generated, and the reunite tendency of nanometer-sized strengthened phase particles Al-Y composite oxide was reduced. The hardness of the weld improved obviously in the TIG welding with the Al-Fe2 O3 filler, and the maximum tensile strength of welded joint is 578 MPa, 80.3% of the base metal.%采用TIG焊对氧化物弥散强化（ ODS）高温合金MGH956进行原位合金化焊接．在相同的焊接条件下，填加两种不同的填充材料：与母材化学成分相似的基体填充材料，以及在基体填充材料基础上加入了合金元素Al和Fe2 O3的Al-Fe2 O3填充材料．通过对比分析两组试样在焊接过程中发生的原位合金化反应机理，及其对焊缝微观组织和力学性能的影响，研究原位合金化反应对ODS合金 TIG焊接头组织与性能的影响．结果表明：在填充材料中加入Al和Fe2 O3合金元素时，焊缝处的气孔数量明显减少，气孔尺寸也较为减小；焊缝中原位生成了新的增强相颗粒Al2 O3、TiC以及YAlO3，同时，基体中的纳米级增强相Al-Y复合氧化物团聚倾向降低．力学性能试验结果表明，填加Al-Fe2 O3填充材料时焊缝显微硬度值明显提高，接头抗拉强度达到了578 MPa，为母材强度的80．3％．
展开▼
