Fracture Analysis of Diffusion-bonded Joint Between Titanium Alloy and Stainless Steel
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摘要: 通过对TA17/0Cr18Ni9Ti相变超塑性扩散焊接头拉伸断口的观察分析, 研究了其接头的组织结构, 断裂机制。分析表明, 在焊接过程中, 由于钛合金/不锈钢两侧的Ti、Fe、Cr等原子的互扩散, 在接头界面处形成了β-Ti、FeTi、Fe2Ti、σ等物相。由于界面处缺陷的存在以及钛合金侧拉向残余应力的存在, 使拉伸断裂主要发生在β-Ti和FeTi中。分析还发现, 接头对缺陷很敏感, 焊接端面上的倒角、划痕及孔洞会使接头的强度降低。Abstract: After phase transformation diffusion bonding of TA17/0Cr18Ni9Ti, the fractures in the bonded joint were observed.The microstructure and fracture mechanism of the joint were investigated.There formed β-Ti, FeTi, Fe2Ti and σ phase around the bonding interface since the interdiffusion of Ti, Fe and Cr atoms.Tensile fracture occurred in FeTi and β-Ti under the tensile load because of the flaws and residual stress.The joint was sensitive to flaws, and the joint strength could be greatly reduced since the presence of chamfer, scratch or pores.
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Key words:
- titanium alloy /
- stainless steel /
- diffusion bonding /
- fracture analysis
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