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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Influence of heat treatment on microstructure and damage tolerance property in Ti-6Al-2Zr-1Mo-1V
FAN Rong-hui(范荣辉), ZHU Ming(朱  明), HUI Song-xiao(惠松骁),
LI De-fu(李德富), SHEN Jian(沈  健)

General Research Institute for Nonferrous Metals, Beijing,100088, China

Abstract: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(KC) test of Ti-6Al-2Zr-1Mo-1V were performed. The results show that the annealing in (α+b) 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; KC increases and da/dN decreases respectively; when annealing in b 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.

 

Key words: Ti-6Al-2Zr-1Mo-1V ; microstructure ; crack propagation rate; fracture toughness

ISSN 1672-7029
CN 43-1423/U

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