High elastic modulus shafts and method of manufacture

US10829831B2 · kind B2 · utility

Assignee

• RAYTHEON TECHNOLOGIES CORPORATION · US

Inventors

• Dilip M. Shah · Glastonbury, US
• Herbert A. Chin · Portland, US
• John Joseph Marcin · Marlborough, US
• Paul L. Reynolds · Tolland, US
• Gabriel L. Suciu · Glastonbury, US
• Paul D. Genereux · Cromwell, US
• Carl E. Kelly · Plantsville, US

Key dates

• Filing date: Jan 20, 2017
• Grant date: Nov 10, 2020
• Expiry date: Mar 8, 2038

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T50/60
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

High modulus turbine shafts and high modulus cylindrical articles are described as are the process parameters for producing these shafts and cylindrical articles. The shafts/articles have a high Young's modulus as a result of having high modulus <111> crystal texture along the longitudinal axis of the shaft/article. The shafts are produced from directionally solidified seeded <111> single crystal cylinders that are axisymmetrically hot worked before a limited recrystallization process is carried out at a temperature below the recrystallization temperature of the alloy. The disclosed process produces an intense singular <111> texture and results in shaft or cylindrical article with a Young's modulus that is at least 40% greater than that of conventional nickel or iron alloys or conventional steels.