Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1995-05-08
1997-07-01
Jordan, Charles T.
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148670, 148671, C22F 118
Patent
active
H00016594
ABSTRACT:
A heat treatment method for producing moderate .alpha. grain size (50-250 .mu.m) fully lamellar, microstructures in thin cross section near-.gamma. titanium aluminide alloy products is described, wherein a wrought, fine y grain starting microstructure is heated at a temperature high in the two-phase .alpha.+.gamma. phase field and 30-60.degree. C. below the .alpha. transus temperature to produce a structure of small equiaxed .alpha. grains (about 25 .mu.m dim) and fine .gamma. phase grains, which is then briefly heated to a temperature in the single-phase .alpha. field in order to complete dissolution of remnant .gamma. grains and to minimize growth of .alpha. grains. The material is then cooled to transform the microstructure to fully lamellar .alpha..sub.2 +.gamma..
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C. McCullough et al, "Phase Equilibria and Solidification in Ti-Al-Alloys" Acta Metall 37(5), 1321-1336 (1989).
S. Semiatin et al, "Homogenization of Near-Gamma Titanium Aluminides: Analysis of Kinetics and Process Scaleup Feasibility," Metall Trans 24A, 1295-1306 Jun. (1993).
Dimiduk Dennis M.
Lee David S.
Semiatin Sheldon L.
Chelliah Meena
Jordan Charles T.
Kundert Thomas L.
Scearce Bobby D.
The United States of America as represented by the Secretary of
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