Method for the dispersion of hard alpha defects in ingots of titanium or titanium alloy and ingots produced thereby
AssigneeGeneral Electric Company
InventorsWinston H. Chang, Robert A. Sprague, Joseph A. Stahl
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Abstract
A method consisting of a high temperature diffusion treatment, preferably preceded by a hot isostatic pressing treatment, by which the deleterious effects of hard alpha defects may be substantially reduced or eliminated from ingots of titanium or titanium alloys without adversely affecting the subsequent structure and properties of ingots processed by the method and the homogenized, substantially hard alpha and inclusion-free ingots produced thereby.
Claims27
A method for the elimination of hard alpha defects from castings or ingots of titanium or titanium alloy comprising the steps of:
- (a) bringing the ingot or ingots to a substantially uniform temperature throughout of between about 2500.degree. to about 2800.degree. F.,
- (b) holding said ingot or ingots for a period of time sufficient to cause homogenization to occur between said hard alpha defects and the titanium or titanium alloy matrix, and
- (c) cooling said ingot or ingots from said substantially uniform temperature to room temperature or a lower temperature for further processing.
A method for the elimination of hard alpha defects from castings or ingots of titanium or titanium alloy comprising the steps of:
- (a) bringing the ingot or ingots to a first substantially uniform temperature throughout of between about 2200.degree. to about 2500.degree. F., in the presence of an isostatic pressure in the range of from about 10 to 30 ksi for a period of about 2 to 4 hours,
- (b) increasing the temperature of said ingots to a second substantially uniform temperature throughout of between about 2500.degree. to about 2800.degree. F.,
- (c) holding said ingot or ingots for a period of time sufficient to cause homogenization to occur between said hard alpha defects and the titantium or titanium alloy matrix, and
- (d) cooling said ingot or ingots from said substantially uniform temperature to room temperature or a lower temperature for further processing.
Dependencies are inferred from the claim text.