Variant M4 Barrel Characterization

Abstract

Four candidate barrels configurations were investigated in the as-received condition and after endurance testing. Each configuration was manufactured from one of two CrMo V steels and either button broach or hammer forge rifling. The investigation noted rough chromium bore coatings, variations in coating thickness, and cracking in the substrate steel in the as-received barrels. Loss of Cr in the forcing cone, widespread Cu deposits and damage to the rifling forward of the forcing cone was noted for all fired barrels.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 2009
Accession Number
ADA591215

Entities

People

  • Christopher Rickard
  • Stephen B. Smith

Organizations

  • United States Army Armament Research, Development and Engineering Center

Tags

DTIC Thesaurus Topics

  • Abstracts
  • Adhesion
  • Availability
  • Chromium
  • Coatings
  • Combustion Products
  • Electron Microscopes
  • Elements
  • Hardness
  • Manufacturing
  • Materials
  • Measurement
  • Metals
  • Microhardness
  • Scanning Electron Microscopes
  • Substrates
  • Thickness

Readers

  • Materials Science and Engineering.
  • Metallurgy
  • ballistics.