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• W103296517 abstract "A study was conducted to explore the possibility of controlling the beta grain size during heat treatment of binary and ternary titanium alloys with aluminum and chromium and to determine the resulting effects on mechanical properties. Beta grain behavior was studied in binary and ternary titanium alloys within the composition ranges of aluminum and chromium normally found in the commercial MST Ti--3Al--SCr alloy. These amounts included: 2.5, 3.1, and 3.75 wt.% aluminum; 4.3, 4.65, and 5.0 wt.% chromium; and combinations thereof. Unalloyed arcmelted iodide and sponge titanium were also included for reference purposes. A preliminary transformation temperature sunvey was made on the unalloyed titanium and the binary and ternary alloys with aluminum and chromium to determine the optimum heat treatment temperatures for obtaining small beta grains. The binary titanium--aluminum alloy compositions studied did not form networks of small beta grains ivhen heat treated just below their transus. The absence of this characteristic prevented control of beta grain growth during heat treatment. The tensile properties were not significantly affected by either the differences in microstructure or by different heat treatments. Networks of small transformed beta grains were obtained in the microstructures of both the binary titanium-chromium series and the ternary titaniummore » alloy series. Chromium promoted the formation of small beta grains at temperatures just below the transus in both binary and ternary series. The tensile strengths of the binary titanium series with chromium were not changed signficantly by heat treatment just under or just above the transus; the alloys were brittle whether the microstructure was composed of small transformed beta gralns or of large transformed acicular beta grains. The presence of small beta grain networks appeared to improve the tensile strength of ternary alloys heat treated just under the transus over the strength of forged material, but with some reduction in elongation. Changing proportions of primary alpha and transformed beta in the microstructures, however, obscured the net effects of the small beta grain networks on the tensile properties. The method of improving mechanical properties by control of beta grain size through heat treatment is sensitive to variations in composition or to inhomogeneity in the alloys and to the interstitial contamination normal in commercial fabrication. This method therefore would not be promising for commercial application. The modulus of elasticity was found to vary with heat treatment in this study, indicating that an improvement of this property in titanium alloys may be possible by heat treatment. (auth)« less" @default.
• W103296517 created "2016-06-24" @default.
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• W103296517 date "1957-09-19" @default.
• W103296517 modified "2023-09-27" @default.
• W103296517 title "INVESTIGATION OF BETA PHASE RECRYSTALLIZATION IN Ti-3% Al-5% Cr ALLOY" @default.
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