F - Mech Eng,Light,Heat,Weapons – 01 – D
Patent
F - Mech Eng,Light,Heat,Weapons
01
D
26/150, 170/71
F01D 5/08 (2006.01) C30B 11/00 (2006.01) C30B 11/14 (2006.01) F01D 5/18 (2006.01)
Patent
CA 1185537
-39- Abstract Alignment of the [001] crystal axis of a face cen- tered cubic metal with the primary z axis of a single crystal axticle provides good thermal fatigue resistance along the z axis, and minimizes cracking transverse to the axis. However, significant cracking is still ob- served parallel the z axis in severe applications. This cracking can be reduced by controlling the secondary crystallographic orientation (i.e., orientation of crys- tal axes within x-y planes transverse to the z axis), to make the [110] crystal axis tangent to the article surface in the region most prone to thermal fatigue cracking. Algorithims derived from empirical relation- ships enable calculation of the orientation likely to produce improved fatigue resistance. More durable single crystal gas turbine blades result when the [110] crystal axis is made tangent to the blade surface in the critical crack prone regions just behind the lead- ing edge of the airfoil at about 40-80% of the airfoil span. A representative improved gas turbine blade will have a secondary orientation angle .alpha. of -10 to +20 degrees, where .alpha. is the angle between the [100] crystal axis and the y axis.
417540
Dierberger James A.
Gemma Anthony E.
Swabey Ogilvy Renault
United Technologies Corporation
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