Environmental Effects on the Incubation Time Characteristics in Stress-Corrosion Cracking

Abstract

Stress corrosion cracking (SCC) experiments were conducted on 4340 steel in NaCI aqueous solutions of different concentrations. Despite the differences in controlling conditions, the experiments yielded similar results for the threshold stress intensity factor and the plateau velocity in the 3.5 wt% NaCI solution. Dependence of the plateau velocity on the NaCI concentration was observed. SCC experiments on 7075-T651 Al alloy were conducted in chromate-inhibited, acidic NaCI aqueous solutions with different concentrations. The SCC process consists of three stages: incubation, transient crack growth, and stable crack growth. The incubation time is highly dependent on the load level. For a given NaCI concentration, the relationship between the applied load and the incubation time follows a power law function. A NaCI concentration of 0.1% results in the shortest incubation time and the fastest plateau velocity.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 2011
Accession Number
ADA553752

Entities

People

  • Yanyao Jiang

Organizations

  • University of Nevada, Reno

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms

DTIC Thesaurus Topics

  • Aqueous Solutions
  • Chemical Synthesis
  • Chemistry
  • Corrosion
  • Cracks
  • Ferrium
  • Fracture (Mechanics)
  • Hydrogen Embrittlement
  • Materials
  • Measurement
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Stress Corrosion
  • Stress Intensity Factors
  • Stress Strain Relations
  • Stresses

Readers

  • Materials Science (Mechanical Engineering).
  • Materials Science and Engineering.
  • Mathematics or Statistics