Mechanical Properties of Annealed and Martensitic Ti-6Al-4V. (A.) Microstructure of Solution Treated Ti-6Al-4V. (B.) A Study of Fatigue Damage with Ultrasonic Internal Friction Measurements. (C.).

Abstract

Fatigue life studies are reported on annealed microstructures and on solution treated plus quenched microstructures, and it was found that specimens solution treated at about 900 C (1650 F) had the longest fatigue life, longer by at least a factor of four. The microstructure of solution treated and quenched Ti-6Al-4V is reported with particular emphasis on the solution temperature of 900 C (1650 F). It is proposed that it is the strain induced transformation of retained beta phase to martensite that is producing the improved fatigue life of this alloy. Internal friction measurements using a resonance technique at kilohertz (17650 Hz) frequency were made on Ti-6Al-4V that had been subject to cyclic fatigue loading. The measurements showed that the internal friction increased as the fatigue damage was increased.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1976
Accession Number
ADA038412

Entities

People

  • C. M. Gilmore
  • M. A. Imam

Organizations

  • George Washington University

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Alloys
  • Chemical Composition
  • Creep
  • Heat Treatment
  • Materials
  • Materials Engineering
  • Materials Science
  • Materials Testing
  • Mechanical Properties
  • Metals
  • Modulus Of Elasticity
  • Resonant Frequency
  • Tensile Properties
  • Tensile Strength
  • Titanium
  • Titanium Alloys
  • Yield Strength

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.