Effect of Sensitization on Corrosion-Fatigue Cracking in Al 5083 Alloy

Abstract

An investigation was carried out to characterize the effect of sensitization (or aging), environment (including [NaCl] concentration), and load ratio on fatigue crack growth and stress-corrosion cracking (SCC) of Al 5083 alloy. Both low and high load ratios, corresponding to R = 0.1 and R = 0.85 were examined. The results indicate: (1) fully sensitized Al 5083 has very low high stress-ratio (at R = 0.85) corrosion-fatigue (CF) threshold stress intensity ( Kth) and SCC threshold (K1SCC) in saltwater; (2) the as-received Al 5083-H131 has good CF and SCC resistance; (3) at 175 C aging temperature, high stress ratio Kth and K1SCC in saltwater decrease with increasing aging time up to about 240 hours; aging times longer than 240 hours produce little additional degradation; (4) sensitization has no effect on fatigue crack growth at low stress ratio of R = 0.1 in any environment, and no effect at any stress ratio in vacuum and in ambient air; (5) both high stress ratio Kth and K1SCC are influenced by [NaCl] concentration, higher [NaCl] results in a lower high stress ratio Kth and K1SCC.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jan 21, 2015
Accession Number
ADA614089

Entities

People

  • P. S. Pao
  • R. A. Bayles
  • R. Goswami
  • Ronald L. Holtz

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Aluminum
  • Aluminum Alloys
  • Chemistry
  • Corrosion
  • Crack Tips
  • Cracks
  • Environment
  • Fatigue Cracking
  • Grain Boundaries
  • Hydrogen Embrittlement
  • Materials
  • Materials Science
  • Mechanics
  • Military Research
  • Resistance
  • Stress Corrosion
  • Stress Corrosion Cracking

Readers

  • Materials Science (Mechanical Engineering).
  • Materials Science and Engineering.