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采用1.5 mm厚QCr0.8铬青铜作为阻隔层进行了TA15钛合金与304不锈钢的电子束焊接,重点分析了焊接接头的横截面形貌、微观组织和力学性能。结果表明,焊缝中存在约0.5 mm宽的未熔QCr0.8阻隔层,实现了Ti元素与Fe元素的物理隔离,避免了Ti-Fe化合物的形成。铜/钢侧焊缝由铜基固溶体与铁基固溶体组成。而钛/铜侧焊缝中V元素的加入很好地抑制了Ti-Cu界面化合物的大量生成,焊缝组织由铜基固溶体、(Ti,V)基固溶体及少量Ti-Cu化合物组成,提高了该区域的强度和塑性。未熔铜阻隔层在热作用下发生软化,接头拉伸断裂发生在未熔的QCr0.8上,接头抗拉强度为293 MPa,为塑性断裂模式。
The 1.5 mm thick QCr0.8 chromium bronze was used as the barrier layer for electron beam welding of TA15 titanium alloy and 304 stainless steel. The cross sectional morphology, microstructure and mechanical properties of the welded joints were analyzed. The results show that there is about 0.5 mm wide unmelted QCr 0.8 barrier layer in the weld, which realizes the physical isolation between Ti element and Fe element and avoids the formation of Ti-Fe compound. The copper / steel side weld consists of a copper-based solid solution and an iron-based solid solution. However, the addition of V element in the titanium / copper side weld suppressed the formation of Ti-Cu interfacial compounds. The weld microstructure consisted of copper-based solid solution, (Ti, V) -based solid solution and a small amount of Ti-Cu compound, The strength and plasticity of the area. The unmelted barrier layer softened under the action of heat. Tensile fracture of the joint occurred on the unmelted QCr0.8. The joint tensile strength was 293 MPa, which was the plastic fracture mode.