Turbine blades made from multiple single crystal cast...

B - Operations – Transporting – 23 – P

Patent

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Details

B23P 15/04 (2006.01) B23K 20/02 (2006.01) B23K 20/16 (2006.01) B23K 35/30 (2006.01) C22C 19/05 (2006.01) C22F 1/10 (2006.01) C30B 11/00 (2006.01) F01D 5/12 (2006.01) F01D 5/14 (2006.01) F01D 5/18 (2006.01) F01D 5/28 (2006.01)

Patent

CA 2307230

Large gas turbine blades (10) made from separate cast segments (12, 14. 16, 18) of superalloys are disclosed. The turbine blade is designed such that bond lines between adjacent segments are placed in low stress regions of the blade. The cast superalloy segments of the blades are aligned and fitted together with specified tolerances. The turbine blade segments are then joined by transient liquid phase bonding, followed by a controlled heat treatment which produces the desired microstructure in the bond region. The method allows for the production of large, high quality turbine blades (10) by joining small, high quality cast superalloy sections (12, 14, 16, 18), in comparison with prior attempts to cast large turbine blades as single pieces which have produced very low yields and high individual component costs.

La présente invention concerne des pales de turbine à gaz de grande taille fabriquées à partir de segments coulés en superalliages. La pale de turbine est conçue de façon que les lignes de collage entre les segments adjacents sont placées dans les zones de contrainte de faible intensité de la pale. Les segments de pale coulés en superalliage sont alignés et emboîtés avec des tolérances déterminées. Les segments de pale sont alors collés par liaison de phase liquide transitoire, et ils sont ensuite soumis à un traitement thermique contrôlé qui permet d'obtenir la microstructure désirée dans la zone de collage. En unissant des petites sections coulées de haute qualité en superalliage, le procédé de la présente invention permet d'obtenir des pales de turbine à gaz de grande taille et de haute qualité, alors que les pales de turbine à gaz de grande taille qui étaient auparavant coulées en une seule pièce présentaient des rendements très faibles et des coûts de composant individuel élevés.

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