C - Chemistry – Metallurgy – 22 – F
Patent
C - Chemistry, Metallurgy
22
F
C22F 1/10 (2006.01) C22C 19/05 (2006.01)
Patent
CA 2503326
The invention relates to heat treatment of cast alloys, such as superalloys, which have at least one addition, so as to improve grain boundary strength. Typically after casting, components often reveal low or no transverse grain boundary strength so that cracks can appear and decrease the yield rate. The invention relates to providing improved grain boundary strength to significantly improve transverse stress rupture strength and ductility of directionally solidified columnar grain castings. The heat treatment involves at least one addition, such as boron, to improve the grain boundary strength.
L'invention concerne un traitement thermique d'alliages comprenant des éléments permettant d'améliorer la résistance des joints de grains. Des composants présentent souvent, juste après le coulage, une faible résistance transversale ou pas de résistance transversale du tout des joints de grains et, par conséquent, des fissures apparaissent et diminuent le taux de production. Le traitement selon l'invention n'engendre pas une faible résistance transversale des joints de grains mais permet de conserver une résistance transversale des joints de grains efficace, de manière que le taux de production de composants sans fissure soit augmenté.
Esser Winfried
Goldschmidt Dirk
Hanslits Christopher R.
Ott Michael
Paul Uwe
Aktiengesellschaft Siemens
Howmet Research Company
Smart & Biggar
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