Correlation of Microstructure with Fracture Toughness Properties in Metals (Part III).

Abstract

Ti-6Al-4V alloy, 1-in. plate was studied for the purpose of establishing a correlation between microstructures and fracture toughness, stress-corrosion cracking, and fatigue crack growth. Both standard and ELI grades, mill-annealed, vacuum-creep-furnace flattened and recrystallization-annealed were included. Reheat-treatments by duplex-annealing and beta- plus duplex-annealing were performed, including air and furnace cooling from the final annealing temperature. A total of 17 conditions were studied, complementing the 49 conditions previously studied on two contracts to Naval Air Systems Command. Tensile, fracture toughness, stress-corrosion cracking, and fatigue crack growth properties were determined. Optical microscopy and scanning electron microfractography were employed. Six conditions studied previously were reexamined by transmission electron microscopy to investigate the effect of cooling rate on the interface phase between alpha and beta phases and on development of short-range order in the alpha phase.

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Document Details

Document Type
Technical Report
Publication Date
Jan 10, 1977
Accession Number
ADA043741

Entities

People

  • Frank A. Crossley
  • Richard E. Lewis

Organizations

  • Lockheed Martin Missiles and Space

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Chemical Synthesis
  • Chemistry
  • Cracks
  • Crystal Structure
  • Diffraction
  • Fast Fractures
  • Fracture (Mechanics)
  • Materials
  • Materials Engineering
  • Materials Science
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Metallurgy
  • Modulus Of Elasticity
  • Physics Laboratories
  • Stress Corrosion Cracking

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Metallurgy

Technology Areas

  • Microelectronics