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The influence of heat treatment on the microstructure and damage tolerance property of Ti-6Al-2Zr-1Mo-1V titanium alloy was investigated. The large-thickness Ti-6Al-2Zr-1Mo-1V titanium alloy plate was produced by β-processing,following with duplex anneal in(α+β) phase field and β anneal,respectively. The fatigue crack propagation rate(da/dN) test and the fracture toughness(KⅠC) test of Ti-6Al-2Zr-1Mo-1V were performed. The results show that the annealing in(α+β) phase field,with increasing anneal temperature,prior β grain size and α colony size of Ti-6Al-2Zr-1Mo-1V remained constant approximately,α lamella mean size increases gradually;KⅠCincreases and da/dN decreases respectively;when annealing in β phase field,prior β grain size and α colony size increases sharply,da/dN decreases drastically. β anneal is better than anneal in(α+β) phase field as to improve the damage tolerance property of Ti-6Al-2Zr-1Mo-1V.
The influence of heat treatment on the microstructure and damage tolerance property of Ti-6Al-2Zr-1Mo-1V titanium alloy was investigated. The large-thickness Ti- 6Al- 2Zr- 1Mo- 1V titanium alloy plate was produced by β-processing, The fatigue crack propagation rate (da / dN) test and the fracture toughness (KIC) test of Ti-6Al-2Zr-1Mo-1V were performed. The results show that the annealing in (α + β) phase field with increasing anneal temperature, prior β grain size and α colony size of Ti-6Al-2Zr-1Mo-1V remained constant approximately, α lamella mean size increasing gradually; when annealed in β phase field, prior β grain size and α colony size increases sharply, da / dN decreases drastically. tolerance property of Ti-6Al-2Zr-1Mo-1V.