US2006021680A1PendingUtilityA1

Beta titanium alloy

41
Individually held — no corporate assignee on recordPriority: Nov 11, 1998Filed: May 31, 2005Published: Feb 2, 2006
Est. expiryNov 11, 2018(expired)· nominal 20-yr term from priority
Inventors:Yue Gao LiPaul A. Blenkinsop
C22C 14/00
41
PatentIndex Score
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Claims

Abstract

A beta titanium alloy comprises 25 wt % vanadium, 15 wt % chromium, 2 wt % aluminium, up to 0.15 wt % oxygen, 0.1 to 0.3 wt % carbon and the balance titanium plus incidental impurities. The carbon is present in the form of titanium carbide precipitates distributed throughout the beta titanium alloy matrix, the titanium carbide precipitates refine the grain size of the beta titanium alloy matrix and remove oxygen from the beta titanium alloy matrix to reduce precipitation of alpha titanium in the beta titanium alloy matrix to increase the ductility of the beta titanium alloy. The alloy is useful for gas turbine engine compressor blades ( 10 ), compressor vanes, compressor casings etc.

Claims

exact text as granted — not AI-modified
1 - 19 . (canceled)  
   
   
       20 . A beta titanium alloy comprising 20 to 30 wt % vanadium, 13 to 17 wt % chromium, 1.0 to 3.0 wt % aluminum, 0.1 to 0.4 wt % carbon, up to 0.2 wt % oxygen and the balance titanium plus incidental impurities, wherein the carbon is present in the form of titanium carbide precipitates distributed throughout the beta titanium alloy matrix, the titanium carbide precipitates refine the grain size of the beta titanium alloy matrix and remove oxygen from the beta titanium alloy matrix to reduce precipitation of alpha titanium in the beta titanium alloy matrix to increase the ductility of the beta titanium alloy; and wherein the beta titanium alloy comprises less than 0.15 wt % oxygen.  
   
   
       21 . A beta titanium alloy consisting essentially of 20 to 30 wt % vanadium, 13 to 17 wt % chromium, 1.0 to 3.0 wt % aluminum, 0.1 to 0.4 wt % carbon, up to 0.2 wt % oxygen and the balance titanium plus incidental impurities, wherein the carbon is present in the form of titanium carbide precipitates distributed throughout the beta titanium alloy matrix, the titanium carbide precipitates refine the grain size of the beta titanium alloy matrix and remove oxygen from the beta titanium alloy matrix to reduce precipitation of alpha titanium in the beta titanium alloy matrix to increase the ductility of the beta titanium alloy, the titanium carbide precipitates consisting essentially of Ti 2 C particles.  
   
   
       22 . A beta titanium alloy as claimed in  claim 21 , wherein the beta titanium alloy comprises 1.5 to 2.5 wt % aluminum.  
   
   
       23 . A beta titanium alloy as claimed in  claim 21 , wherein the beta titanium alloy comprises 0.15 to 0.3 wt % carbon.  
   
   
       24 . A beta titanium alloy as claimed in  claim 21 , wherein the beta titanium alloy comprises 23-27 wt % vanadium, 13-17 wt % chromium, 1-3 wt % aluminum, up to 0.15 wt % oxygen, 0.1 to 0.3 wt % carbon and the balance titanium plus incidental impurities.  
   
   
       25 . A beta titanium alloy as claimed in  claim 21 , wherein the beta titanium alloy comprises 25 wt % vanadium, 15 wt % chromium, 2 wt % aluminum, up to 0.15 wt % oxygen, 0.1 to 0.3 wt % carbon and the balance titanium plus incidental impurities.  
   
   
       26 . An article comprising a beta titanium alloy 21, the beta titanium alloy consisting essentially of 20 to 30 wt % vanadium, 13 to 17 wt % chromium, 1.0 to 3.0 wt % aluminum, 0.1 to 0.4 wt % carbon, up to 0.2 wt % oxygen and the balance titanium plus incidental impurities, wherein the carbon is present in the form of titanium carbide precipitates distributed throughout the beta titanium alloy matrix, the titanium carbide precipitates refine the grain size of the beta titanium alloy matrix and remove oxygen from the beta titanium alloy matrix to reduce precipitation of alpha titanium in the beta titanium alloy matrix to increase the ductility of the beta titanium alloy, the titanium carbide precipitates consisting essentially of Ti 2 C particles.  
   
   
       27 . An article as claimed in  claim 26 , wherein the beta titanium alloy comprises 23-27 wt % vanadium, 13-17 wt % chromium, 1-3 wt % aluminum, up to 0.15 wt % oxygen, 0.1 to 0.3 wt % carbon and the balance titanium plus incidental impurities.  
   
   
       28 . An article as claimed in  claim 27 , wherein the beta titanium alloy comprises 25 wt % vanadium, 15 wt % chromium, 2 wt % aluminum, up to 0.15 wt % oxygen, 0.1 to 0.3 wt % carbon and the balance titanium plus incidental impurities.  
   
   
       29 . An article as claimed in  claim 26 , wherein the article comprises a component for a gas turbine engine.  
   
   
       30 . An article as claimed in  claim 29 , wherein the component comprises a compressor blade or a compressor vane.  
   
   
       31 . An article as claimed in  claim 29 , wherein the component comprises a tip portion for a compressor blade.  
   
   
       32 . A beta titanium alloy consisting essentially of at least 10 wt % of one or more beta stabilising elements, aluminum, 0.1 to 0.4 wt % carbon, up to 0.2 wt % oxygen and the balance titanium and incidental impurities, wherein the carbon is present in the form of titanium carbide precipitates distributed throughout the beta titanium alloy matrix, the titanium carbide precipitates refine the grain size of the beta titanium alloy matrix and remove oxygen from the beta titanium alloy matrix to reduce precipitation of alpha titanium in the beta titanium alloy matrix to increase the ductility of the beta titanium alloy, the titanium carbide precipitates consisting essentially of Ti 2 C particles.  
   
   
       33 . A beta titanium alloy as claimed in  claim 32 , wherein the beta stabilising element is selected from the group consisting of vanadium, molybdenum, tantalum, niobium, chromium, tungsten, manganese and iron.  
   
   
       34 . A beta titanium alloy as claimed in  claim 32 , wherein the beta titanium alloy comprises 1.5 to 2.5 wt % aluminum.  
   
   
       35 . A beta titanium alloy as claimed in  claim 32 , wherein the beta titanium alloy comprises 0.15 to 0.3 wt % carbon.  
   
   
       36 . A beta titanium alloy as claimed in  claim 32 , wherein the beta titanium alloy comprises less than 0.15 wt % oxygen.  
   
   
       37 . A beta titanium alloy as claimed in  claim 32 , wherein the alloy is suitable for use as a tip for a compressor blade.

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