Processing, Mechanical Properties, and Ballistic Impact Effects of Austempered Ductile Iron

Abstract

This study describes the resistance to penetration and the damage to austempered ductile iron (ADI) from ballistic impact. The resistance to penetration is determined with an average velocity with a 50% probability for complete penetration, the V-50 ballistic limit. The responses of the ADI material to impact are shown by observations of penetration modes, microstructural changes, and fracture topographies. Mechanical properties and ballistic limits are shown for two variations of the austemper process. ADI targets reveal a capability for multiple impacts without structural failures. Penetration modes include ductile hole growth, radial fracture, petaling, and scabbing. V-50 velocities of ADI with lower values of hardness and strength are equal or greater than the V-50 velocities of ADI with higher values of hardness and strength. Graphite spheroids of this ductile cast iron appear to affect plastic deformation and penetration modes by localizing stresses, microstructural changes, and fracture.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1998
Accession Number
ADA352879

Entities

People

  • Brian Pothier
  • John F. Chinella
  • Martin G. Wells

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Chemical Analysis
  • Chemistry
  • Crystal Structure
  • Deformation (Mechanics)
  • Failure Mode And Effect Analysis
  • Hardness
  • Iron
  • Materials
  • Materials Science
  • Materials Testing
  • Mechanical Properties
  • Mechanics
  • Modulus Of Elasticity
  • Plastic Deformation
  • Resistance
  • Tensile Strength
  • Test Methods

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Metallurgy
  • ballistics.