Patents by Inventor Gunnar Harkeg.ang.rd

Gunnar Harkeg.ang.rd 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).

  • Heat treatment process for material bodies made of a high-temperature-resistant iron-nickel superalloy, and heat-treatment material body
    Patent number: 6146478
    Abstract: A heat treatment process for material bodies made of a high-temperature-resistant iron-nickel superalloy of the type IN 706 comprises the following steps: solution annealing at approximately 965 to 995.degree. C. for 5 to 20 hours, stabilization annealing at approximately 775 to 835.degree. C. for 5 to 100 hours, and precipitation hardening at 715 to 745.degree. C. for 10 to 50 hours and at 595 to 625.degree. C. for 10 to 50 hours. A heat-treated material body of this kind, made of a high-temperature-resistant iron-nickel superalloy of the type IN 706 exhibits a crack growth rate of less than 0.05 mm/h and/or exhibits a minimum elongation of 2.5% without cracks at a constant strain rate of 0.05%/h and a temperature of 600.degree. C.
    Type: Grant
    Filed: October 22, 1997
    Date of Patent: November 14, 2000
    Assignee: Asea Brown Boveri AG
    Inventors: Werner Balbach, Gunnar Harkeg.ang.rd, Reiner Redecker