Effects of initial microstructure on the earring of aluminium alloys cartridge case

  • Ljubica M. Radovic Militry Technical Institute, Serbia
  • Jelena Marinkovic Military Technical Institute, Serbia
  • Milorad Stanic Sloboda Company Cacak, Serbia
Keywords: cartridge case, impact extrusion, earring, EN AW-5754 aluminium alloy

Abstract

Defects obtained during impact extrusion of EN AW-5754 aluminium alloy during cartridge case production were investigated. In cartridge cases produced from the one metallurgical heat pronounced tendency to earing after impact extrusion observed/appeared. On the other hand the earing in cartridge cases from the other heat was not observed. Presence of earing is due to local difference in materials flow during extrusion. This behaviour is atriduted to dfference in second phase particle distribution in used preforms (slugs).

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Published
2019-03-31
Section
Full length research papers