Title:
IMONONO SHORIHOHO
Document Type and Number:
Japanese Patent JPS5129321
Kind Code:
A
Abstract:
1473980 Treating castings HOWMET CORP 24 June 1975 3 July 1974] 26713/75 Heading B3F Superalloy castings such as turbine blades or vanes, or wheels, having internal voids are treated by heating, without any surface finishing operation, to a temperature allowing interdiffusion of the metal and subjecting the castings to a gaseous atmosphere of more than 10,000 psi, i.e. hot isostatic pressing. The gas is preferably Ar, but air can be used if the castings are first packed in a container, preferably together with a filler. The temperature is preferably below the solidus temperature. Gates and runners, cores and portions of the mould may be left in place during treatment. To achieve a casting as free as possible of surface voids, (i.e. by more rapid freezing), the mould may be preheated to a lower than normal temperature, or nucleants may be provided on the mould surface, e.g. cobalt oxide, cobalt aluminate, cobalt silicate. Examples are given of suitable Co and Ni based superalloys.
Inventors:
UIRIAMU AARU FURIIMAN JUNIA
RUISU II DAADEI
RUISU II DAADEI
Application Number:
JP8233475A
Publication Date:
March 12, 1976
Filing Date:
July 03, 1975
Export Citation:
Assignee:
HOWMET CORP
International Classes:
B22D31/00; C22C1/00; C22F1/10; B23P6/00; (IPC1-7): B22D45/00; C22C1/00; C22F1/10