Research on Growth of Microcracks in Nickel-Base Superalloys.

Abstract

The growth of very small, 0.06-0.15 mm, fatigue cracks in a powder metallurgy nickel-base superalloy, IN-100, was studied. Tests were conducted at room temperature and at 650 C. The crack growth rates were measured by means of a 600X microscope which allowed in situ crack length measurement, even at elevated temperature. The interaction of the crack and the material microstructure was observed in a fatigue loading stage which operated in the Scanning Electron Microscope. A technique for experimentally determining stress intensity factors was also developed.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1978
Accession Number
ADA065180

Entities

People

  • G. P. Sheldon
  • James Lankford
  • Thomas S. Cook

Organizations

  • Southwest Research Institute

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Air Force
  • Alloys
  • Electron Microscopes
  • Fracture (Mechanics)
  • Grain Size
  • High Temperature
  • Materials
  • Materials Engineering
  • Materials Laboratories
  • Materials Science
  • Measurement
  • Mechanics
  • Metallurgy
  • Microscopes
  • Powder Metallurgy
  • Scanning Electron Microscopes
  • Stress Intensity Factors

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).

Technology Areas

  • Microelectronics