00000nam 2200000za 4500 9.841460 CaOODSP 20221107152107 cr ||||||||||| 170810s1971 oncad ob f000 0 eng d CaOODSP eng eng fre n-cn--- M34-20/132E-PDF M34-20/132 Biefer, G. J., 1921- Preliminary measurements of the environmental cracking behaviour of titanium alloy 721 [electronic resource] / G.J. Biefer and J.G. Garrison, Physical Metallurgy Division. Ottawa : Information Canada, 1971. iv, 15 p. : chart, ill. Technical bulletin ; TB 132 Cover title. "February 1971." Digitized edition from print [produced by Natural Resources Canada]. Includes bibliographical references. “In order to test the functioning of equipment, and to gain some initial experience concerning the environmental cracking susceptibility of Ti-7%Al-2%Nb-1%Ta (Ti-721) alloy, some tests were carried out on notched, precracked specimens loaded as cantilevers. In tests performed in 3.5% NaCl solution, it was confirmed that, subsequent to a sensitizing heat treatment designed to produce Ti3Al (8 hr at 650°C (1202°F)), alloy Ti-721 is extremely susceptible to environmental cracking. It is somewhat more resistant in the as-rolled condition. Environmental cracking tests in which specimens were broken under a gradually rising load were found to give very nearly the same results as did time-to-failure tests under a constant load. It appeared, therefore, that the rising-load method was sufficiently accurate for screening tests of alloys resembling Ti-721, though constant load tests might sometimes be needed for a more precise determination of the critical stress-intensity threshold for cracking, KISCC"--Abstract, p. i. Includes abstract in French. gccst Metals Garrison, J. G. Canada. Natural Resources Canada. Canada. Mines Branch. Technical bulletin (Canada. Dept. of Energy, Mines and Resources. Mines Branch) TB 132 (CaOODSP)9.834857 PDF 2.13 MB https://publications.gc.ca/collections/collection_2017/rncan-nrcan/M34-20/M34-20-132-eng.pdf 300017