Fatigue in Single Crystal Nickel Superalloys

Abstract

This program investigates the seemingly unusual behavior of single crystal airfoil materials. The fatigue initiation processes in single crystal (SC) materials are significantly more complicated and involved than fatigue initiation and subsequent behavior of a (single) macrocrack in conventional, isotropic, materials. To understand these differences it is helpful to review the evolution of high temperature airfoils. Modern gas turbine flight propulsion systems employ single crystal materials for turbine airfoil applications because of thier superior performance in resisting creep, oxidation, and thermal mechanical fatigue (TMF). These properties have been achieved by composition and alloying, of course, but also by appropriate crystal orientation and associated anisotropy.

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Document Details

Document Type
Technical Report
Publication Date
May 15, 1993
Accession Number
ADA265451

Entities

People

  • Charles G. Annis
  • Daniel P. Deluca

Organizations

  • Pratt & Whitney

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Alloys
  • Crystals
  • Fracture (Mechanics)
  • Gas Turbines
  • Grain Boundaries
  • Heat Treatment
  • High Temperature
  • Materials
  • Mechanics
  • Microstructure
  • Nickel
  • Nickel Aluminide
  • Orientation (Direction)
  • Probability
  • Propulsion Systems
  • Single Crystals
  • Transitions

Fields of Study

  • Materials science
  • Physics

Readers

  • Aerodynamics.
  • Materials Science (Mechanical Engineering).
  • Powder metallurgy of Titanium alloys.