Patents by Inventor Gerald F. Mathey

Gerald F. Mathey has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of making superalloy turbine disks having graded coarse and fine grains
    Patent number: 5312497
    Abstract: A method and apparatus for heat-treating nickel base superalloy articles to provide different properties in different regions of the article. An initially fine grain microstructure is heated such that a portion of the article is held above the .gamma.' solvus temperature long enough to provide a coarse grain microstructure while the remainder of the article remains below the .gamma.' solvus temperature and retains the fine grain microstructure. The coarse grain microstructure provides a reduced rate of fatigue crack growth rate while the fine grain microstructure retains good tensile properties. The invention is particularly applicable to the fabrication of turbine disks for gas turbine engines.
    Type: Grant
    Filed: December 31, 1991
    Date of Patent: May 17, 1994
    Assignee: United Technologies Corporation
    Inventor: Gerald F. Mathey