Metal treatment – Compositions – Heat treating
Patent
1989-05-22
1991-12-31
Dean, R.
Metal treatment
Compositions
Heat treating
148 115F, 148133, 420427, C22F 1018
Patent
active
050768581
ABSTRACT:
A method of preparing a TiAl base composition containing niobium and chromium according to the formula Ti.sub.48 Al.sub.48 Cr.sub.2 Nb.sub.2 is taught. The composition is melted and cast. It is then homogenized at temperatures up to 1400.degree. C. The cast and homogenized composition is enclosed in a restraining band, heated to forging temperature and forged. Following the forging, it is annealed and aged.
REFERENCES:
patent: 4661316 (1980-04-01), Hashimoto et al.
patent: 4842819 (1989-06-01), Huang et al.
Izvestiya Akademii Nauk SSSR, Metally, No. 3 (1984), pp. 164-168-Transln. ("Deformation & Failure in Titanium Aluminide" (1985), pp. 157-161.
Martin PL/Lipsitt, HA/Nuhfer, NT/Williams, JC, "The Effects of Allowing on the Microstructure and Properties of Ti.sub.3 Al and TiAl", Titanium 80 (published by The American Society of Metals, Warrendale, Pa.), vol. 2 (1980), pp. 1245-1254.
Tsujimoto, T, "Research, Development, and Prospects of TiAl Intermetallic Compound Alloys", Titanium & Zirconium, vol. 33, No. 3, 159 (Jul. 1985), pp. 1-19.
Lipsitt, HA, "Titanium Aluminides-An Overview", Mat. Res. Soc. Symposium Proc, vol. 39, Materials Research Society (1985), pp. 351-364.
Sastry et al., Met. Trans. 8A, "Fatigue Deformation of TiAl Base Alloys" (1977), pp. 299-308.
Davis Jr. James C.
Dean R.
General Electric Company
Magee Jr. James
Phipps Margery S.
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