Characterization of 'White Layer' and Chrome Plating on Fired Cannon and on Laboratory Simulation Samples.

Abstract

This work confirms that the effect of exposure of 4340 steel cannon tubes to firing is the formation of Fe3C and 1% C-austenite on the surface. The stress generated by the explosion results in the formation of rather uniform networks of shallow and deep cracks. Particular attention was given to the structure of these cracks because they contained TiO2 (sometimes added to the charge), Cu, S, and Al. Examination of the microstructure of electrodeposited chromium revealed a strong dependence of grain structure on plating conditions. The void space between the aligned cylindrical grains is probably responsible for the high tensile stresses in chrome plating and the propensity for severe cracking.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1982
Accession Number
ADA116284

Entities

People

  • A. Szirmae
  • R. M. Fisher

Organizations

  • U.S. Steel

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Diffraction
  • Electron Microscopes
  • Electron Microscopy
  • Electropolishing
  • Explosive Charges
  • Explosives
  • Films
  • Fungi
  • High Voltage
  • Materials
  • Microscopy
  • Spectra
  • Spectroscopy
  • Surface Properties
  • Surface Roughness
  • Tensile Stress
  • X Ray Spectra

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Materials Science and Engineering.
  • Surface Engineering/Surface Coating Technology.

Technology Areas

  • Space