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| ON HOT SALT STRESS CORROSION CRACKING OF TITANIUM ALLOY Ti-679 |
| Yu Bingxi Zhang Suisheng and Wan Xiaojing(Institute of Metal Research; Academia Sinica) |
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Abstract It has been proved that most of the titanium alloys are susceptible to the so-called hot salt stress corrosion cracking under the combined action of high temperature, halide salt and stresses.In this paper the susceptibility of hot salt stress corrosion cracking of titanium alloy Ti-679 was investigated in the temperature range of 350～500°C.Experimental studies show that the microstructure of the alloy has pronounced effect on the susceptibility of H.S.S.C.C.It was shown that the threshold stress for H.S.S.C.C.of the specimens with α+β annealed structure was higher than that of the specimens with β annealed structure under the same hot exposure conditions.Experimental results also proved that the threshold stress of the specimens with compressive stress on the surface was higher than that of the specimens without it.Ion microprobe scanning analyses on the fractured surface showed that hydrogen was greatly concentrated at the crack surface and that hydrogen produced during the stress corrosion of titanium alloy by halide salt and subsequently absorbed by the alloy was responsible for cracking.
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Received: 25 February 1983
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[1] 虞炳西,张绥生,万晓景,金属学报,18,3(1982)
[2] 李东,IM1679钛合金,中国科学院金属研究所内部资料,(1973)
[3] Aerospace structural Metals Handbook, 2, code 3711, 31 (1970)
[4] H. R. Gray, NASA TN D-6188 (1971)
[5] J. R. Myers and J. A. Hall, Corrosion, 33, 7, 252(1977) |
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