THE EFFECT OF HEAT TREATMENT ON THE FRACTURE TOUGHNESS AND SUBCRITICAL CRACK GROWTH CHARACTERISTICS OF A 350-GRADE MARAGING STEEL

Abstract

The heat treatment response of a 350-grade maraging steel, with the nominal composition 18.5 Ni, 12 Co, 4.6 Mo, 1.4 Ti, balance Fe, has been determined in billet and bar form. When aged at temperatures below 900F, the material was very susceptible to subcritical crack growth, and premature brittle fracture occurred in unnotched tension specimens loaded at a slow strain rate in laboratory air. Fracture mechanics was used to interpret this behavior.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1969
Accession Number
AD0692165

Entities

People

  • C. S. Carter

Organizations

  • Boeing Commercial Airplanes

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aerospace Industry
  • Aircrafts
  • Airplanes
  • Chemical Analysis
  • Chemistry
  • Corrosion
  • Crack Tips
  • Ferrium
  • Fracture (Mechanics)
  • Heat Treatment
  • Maraging Steels
  • Materials
  • Mechanical Properties
  • Mechanics
  • Resistance
  • Tensile Properties
  • Tensile Strength

Readers

  • Materials Science and Engineering.
  • Mechanical Engineering/Mechanics of Materials.
  • Metallurgy