Establish Manufacturing Methods for Closed Die Aluminum Forgings with Improved Stress Corrosion Resistance

Abstract

To evaluate SCC susceptibility as it relates to forging processing, a 7079 aluminum alloy landing gear outer cylinder was produced using five different forging techniques. Three of these techniques formed the part with a solid barrel using differing preliminary open die working. The other two techniques involved forward and backward extrusion. Standard uniaxial-tensile testing revealed no significant difference between the various forging techniques. However, alternate immersion stress corrosion testing in 3 1/2% NaC1 indicated differences in stress corrosion cracking susceptibility. The two extruded forgings (forward and back) were significantly more resistant to SCC. The forward extruded parts were somewhat more resistant to SCC than the back extruded parts, but were also substantially more expensive to produce.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1969
Accession Number
AD0863247

Entities

People

  • Anthony G. Cerrone
  • Charles A. Morris

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Alloys
  • Extrusion
  • Failure Mode And Effect Analysis
  • Heat Treatment
  • Landing Gear
  • Machines
  • Manufacturing
  • Material Degradation Processes
  • Materials
  • Materials Laboratories
  • Materials Processing
  • Materials Testing
  • Sheets
  • Standards
  • Strain Gages
  • Stress Corrosion Cracking
  • Tensile Testing

Fields of Study

  • Materials science

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Materials Science and Engineering.
  • Powder metallurgy of Titanium alloys.