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US 5,178,694 AGranted
Surface hardening of Ti-6Al-4V by electrolytic hydrogenation
AssigneeNational Science Council
InventorsJiann-Kuo Wu, Tair-I Wu
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Abstract
Disclosed is a process of surface hardening of Ti-6A1-4V alloy that can be performed by electrolytic charging in an acid solution, subsequent solution treatment, followed by dehydrogenation to obtain an equiaxed alpha grain in transformed beta matrix. Surface hardnesses of the processed specimens are better than that of the mill-annealed specimen. The depth of hardened layer depends on the charging time.
Claims5
A process for surface hardening a titanium alloy, comprising:
- (a) cathodically charging the titanium alloy in an acid solution;
- (b) heating the titanium alloy to a temperature range of 500.degree. C. to 650.degree. C.;
- (c) solution treating the titanium alloy in an air furnace for producing an oxide film on the titanium alloy;
- (d) furnace cooling the titanium alloy to room temperature;
- (e) removing the oxide film of the titanium alloy;
- (f) dehydrogenating the titanium alloy in a vacuum furnace at 700.degree. C. to 900.degree. C.;
- (g) furnace cooling the titanium alloy to room temperature.
4 more elements
Dependencies are inferred from the claim text.