Superalloy for single crystal turbine vanes

Details Superalloy for single crystal turbine vanes Superalloy for single crystal turbine vanes

2006-03-14

2006-03-14

King, Roy (Department: 1742)

Metal treatment

Stock

Nickel base

C420S448000

Reexamination Certificate

active

07011721

ABSTRACT:
A nickel-base superalloy that is useful for making single crystal castings exhibiting outstanding stress-rupture properties, creep-rupture properties, and an increased tolerance for grain defects contains, in percentages by weight, from about 4.7% to about 4.9% chromium, (Cr), from about 9% to about 10% cobalt (Co), from about 0.6% to about 0.8% molybdenum (Mo), from about 8.4% to about 8.8% tungsten (W), from about 4.3% to about 4.8% tantalum (Ta), from about 0.6% to about 0.8% titanium (Ti), from about 5.6% to about 5.8% aluminum (Al), from about 2.8% to about 3.1% rhenium (Re), from about 1.1% to about 1.5% hafnium (Hf), from about 0.06% to about 0.08% carbon (C), from about 0.012% to about 0.020% boron (B), from about 0.004% to about 0.010% zirconium (Zr), the balance being nickel and incidental impurities. The nickel-base superalloy provides improved casting yield and reduce component cost due to a reduction in rejectable grain defects as compared with conventional directionally solidified casting alloys and conventional single crystal alloys.

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Exhibit A is an article entitled “CM 186 LC®Alloy Single Crystal Turbine Vanes”, by Phil S. Burkholder, Malcolm C. Thomas, Randy Helmink, Donald J. Frasier, Ken Harris and Jacqueline B. Wahl, published by the American Society of Mechanical Engineers, pp. 1-8, Jun. 7, 1999, International Gas Turbine and Aeroengine Congress & Exhibition, Indianapolis, Indiana.
Exhibit B is an article entitled “New Superalloy Concepts for Single Crystal Turbine Vanes and Blades”, by Ken Harris and Jacqueline B. Wahl, published by Cannon-Muskegon Corporation, published Jul. 3, 2000, Parsons 2000, 5thInternational Charles Parsons Turbine Conference, Churchill College, Cambridge, UK.

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