A Procedure for Investigating the Effect of Hydrogen Content on Toughness and Sustained Load Cracking Resistance of Titanium Alloys, with Some Results for Ti-6Al-4V

Abstract

A procedure for measuring the effect of hydrogen content on the toughness and resistance to sustained load crack (SLC) growth of titanium alloys is presented. The results of such measurements on a high oxygen content, very high yield strength heat of 1-in. thick Ti-6Al-4V alloy (R-23B) are compared with results for a low oxygen content, moderately high yield strength heat (R- 14). Both fracture toughness and SLC resistance of R-23B are greatly reduced by small amounts (35 ppm) of hydrogen added to vacuum annealed specimens. The fracture toughness, but not SLC resistance, of R-14 was likewise affected, in the hydrogen content range from 9 ppm to 125 ppm. The substantial gain in toughness due to vacuum annealing a commercial heat of Ti-6Al-4V (R-23B), without reduction in hardness, raises the possibility of developing a vacuum annealing schedule for greatly increasing the reliability of critical high strength structural parts.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1972
Accession Number
AD0746443

Entities

People

  • Dale A. Meyn

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Classification
  • Crack Propagation
  • Fracture (Mechanics)
  • Heat Treatment
  • Hydrogen
  • Materials
  • Measurement
  • Mechanical Properties
  • Mechanics
  • Metallurgy
  • Military Research
  • Physical Metallurgy
  • Resistance
  • Stress Corrosion Cracking
  • Titanium Alloys
  • Transverse
  • Yield Strength

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Metallurgy