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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 2    April 2002

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Superplastic bulging capability of
Ti-6Al-4V buttcover plate
ZHANG Kai-feng(张凯锋), WANG Gang(王  刚), WU De-zhong(吴德忠),
ZHENG Hai-rong(郑海荣), CHEN Hui-bin(陈惠滨)

School of Materials Science and Engineering,
Harbin Institute of Technology, Harbin 150001, China

Abstract:The investigation on the superplastic bugling capability of 1.5mm mill annealed Ti-6Al-4V buttcover plate by means of manual gas tungsten arc welding (M-GTAW) and fusion type plasma arc welding (F-PAW) have been evaluated respectively. The result shows that untreated Ti-6Al-4V buttcover plate by M-GTAW exhibits no superplasticity, while the same untreated plate by F-PAW, shows good superplastic ability because of extremely fine acicular martensite microstructure of weld metal. To the buttcover plate by M-GTAW, the microstructure of weld metal changed into streaky α structure which exhibits good superplasticity from the original β structure under the condition of the constant temperature of 940℃ with the deformation degree of 45%, and changed into the fine equiaxed grain which possesses excellent superplastic ability under the condition of the constant temperature of 800℃ with the deformation degree of 40%.

 

Key words: superplastic forming; Ti-6Al-4V alloy; isothermal hot-compression; buttcover plate

ISSN 1672-7029
CN 43-1423/U

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