Metallurgical method for processing nickel- and iron-based super

Details Metallurgical method for processing nickel- and iron-based super Metallurgical method for processing nickel- and iron-based super

1998-08-03

2000-10-10

Wyszomierski, George

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148611, 148624, 148677, C21D 800, C22F 110

Patent

active

06129795&

ABSTRACT:
A method is provided for improving the microstructure of nickel and iron-based precipitation strengthened superalloys used in high temperature applications by increasing the frequency of "special", low-.SIGMA. CSL grain boundaries to levels in excess of 50%. Processing entails applying specific thermomechanical processing sequences to precipitation hardenable alloys comprising a series of cold deformation and recrystallization-annealing steps performed within specific limits of deformation, temperature, and annealing time. Materials produced by this process exhibit significantly improved resistance to high temperature degradation (eg. creep, hot corrosion, etc.), enhanced weldability, and high cycle fatigue resistance.

REFERENCES:
patent: 3639179 (1972-02-01), Reichman et al.
patent: 5702543 (1997-12-01), Palumbo
Palumbo, G., et al., "Grain Boundaries With Special Properties," Materials Interfaces, Chapman & Hall, London, 1992, pp. 190-211.

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