Stress Corrosion Cracking of High Strength Steels

Abstract

The stress corrosion cracking (SCC) was investigated for AerMet 100 and 300M steels in four aqueous NaCl solutions of different concentrations (0.035-3.5%), three of which had an identical electrical conductivity (12.44 x 10(exp -4) sq m S/mol). Especially, the variation of threshold stress intensity for SCC, K(ISCC), with cathodic potential was evaluated, employing rising step load test method. The K(ISCC) increased, peaked at around the potential of -0.7 V(SCE), and then decreased with increasing potential for AerMet 100 steel. On the other hand, the K(ISCC) did not change much with potential for 300M steel. The open circuit potential and the corresponding K(ISCC) were greater for AerMet 100 steel than for 300M steel, indicating the former nobler and more SCC resistant. The SEM fractographs showed mixed cleavage and intergranular cracking, more cleavage for AerMet 100 steel but more intergranular for 300M steel, at all potentials employed.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1995
Accession Number
ADA375902

Entities

People

  • Bhaskar Sarkar
  • Eun U. Lee
  • Henry Sanders

Organizations

  • Naval Air Warfare Center

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircrafts
  • Aqueous Solutions
  • Cantilever Beams
  • Conductivity
  • Corrosion
  • Cracks
  • Electrical Conductivity
  • Intensity
  • Materials
  • Mixtures
  • Resistance
  • Steel
  • Stress Corrosion
  • Stress Corrosion Cracking
  • Stress Tests
  • Tensile Strength
  • Test Methods

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.