Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1995-01-30
1997-05-20
Sheehan, John
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148527, 22826271, C22F 118
Patent
active
056308906
ABSTRACT:
A hollow article is made by providing and diffusion bonding the opposing parts of an article made of an alpha-beta titanium alloy. Hydrogen is introduced into the surface of an internal cavity before, during, or after diffusion bonding. The article is heat treated with the hydrogen present, typically by solution treating and aging the hydrogen-containing bonded article. The result is the production of a microstructure at the internal surface of the cavity that is resistant to fatigue-crack initiation, while retaining a microstructure throughout the rest of the article that is resistant to fatigue-crack propagation. After heat treating, the hydrogen is removed from the article, and any further heat treating and other operations are completed.
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Abstract of "Superplastic Forging of Ti Powder Preforms" by Kimura, et al., J. Japanese Society of Powder Metallurgy, vol. 38 (1991) pp. 650-655 (abstract only).
Gigliotti, Jr. Michael F. X.
Meltsner Kenneth J.
Smashey Russell W.
Woodfield Andrew P.
General Electric Company
Hess Andrew C.
Narciso David L.
Sheehan John
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