Process of grain enlargement in consolidated alloy powders
AssigneeTecphy
InventorJames Davidson
Life of this patent
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Abstract
A method for obtaining a product from pre-alloyed powders in which the powders are subjected to compaction treatment. The powders are first subjected to pre-treatment under low pressure (or without pressure) at a temperature such that segregating materials precipitate out in stable phases.
Claims10
A method of manufacture of a product having increased resistance to creep and crack propagation from prealloyed powder of a nickel-based superalloy, said method comprising the steps of:
- (a) preparing a prealloyed powder of a nickel-based superalloy, particles of said powder having a size limited by screening, and having segregated elements on their surface;
- (b) subjecting said powder to a preheat treatment of internally precipitating said segregated elements in stable phases inside said particles of powder, said preheat treatment being carried out under low pressure or without pressure and at a temperature below an incipient melting point of said superalloy;
- (c) subjecting said powder to a consolidation treatment by hot compaction under high pressure for manufacturing said product;
- and
- (d) subjecting said product to a stage of enlarging the sizes of metallurgical grain of the alloy beyond the boundaries of the powder particles by heating at a temperature above the solvus temperature of the alloy.
A method of manufacture of a product having increased resistance to creep and crack propagation from prealloyed powder of a nickel-based superalloy, said method comprising the steps of:
- (a) preparing a prealloyed powder of a nickel-based superalloy, particles of said powder having a size limited by screening, and having segregated elements on their surface;
- (b) subjecting said powder to a preheat treatment of internally precipitating said segregated elements in stable phases inside said particles of powder, said preheat treatment being carried out under low pressure or without pressure and at a temperature below an incipient melting point of said superalloy;
- (c) subjecting said powder to a consolidation treatment by hot compaction under high pressure for manufacturing said product;
- (d) said hot compaction treatment comprising a stage of enlarging the sizes of metallurgical grain of said superalloy beyond boundaries of said particles by heating under high pressure at a temperature above a solvus temperature of said superalloy.
Dependencies are inferred from the claim text.