Isothermal Heat Treatment for High Strength Ductile Iron Castings.

Abstract

Austempered ductile iron containing nickel was investigated as an economical substitute for alloy steel forgings currently used as critical components in armored vehicles (M113 personnel carrier). An optimum austemper treatment evolved which resulted in a cast ductile iron which delivered 135 ksi ultimate, 97 ksi yield strength and 11% elongation. Low temperature (-40F) impact toughness was 3 ft-lbs and rotational bending fatigue strength was 62.5 ksi at room temperature. A quantity of select components namely, suspension arm, sprocket and track shoe were cast, heat treated and finished machined to demonstrate the applicability of the manufacturing process as well as the service performance of these cast components when subjected to field testing under extreme environmental conditions. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1976
Accession Number
ADA035433

Entities

People

  • Clarence J. Carter
  • Raymond A. Cellitti
  • Robert E. Wahlstrom

Tags

Communities of Interest

  • Air Platforms
  • Human Systems
  • Weapons Technologies

DTIC Thesaurus Topics

  • Armored Vehicles
  • Chemistry
  • Heat Treatment
  • Iron Alloys
  • Low Temperature
  • Machining
  • Manufacturing
  • Materials
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Military Research
  • Tensile Properties
  • Tensile Strength
  • Toughness
  • Wear Resistance
  • Yield Strength

Fields of Study

  • Materials science

Readers

  • Electrical Engineering
  • Metallurgy