Fracture Toughness and Stress Corrosion Characteristics of High Strength Maraging Steel

Abstract

The effect of heat treatment on the tensile, fracture toughness, and stress corrosion properties of a high strength maraging steel (nominal composition 16.3 Ni-12.87 Co-4.98 Mo-0.78 Ti) is described. A maximum ultimate tensile strength of 323 ksi, combined with a fracture toughness of 62 ksi sq root of in. was achieved. This strength level appears to be the maximum which can be achieved in maraging type steels without decreasing the crack tolerance below that of currently used high strength low alloy steels. Reversion to austenite did not improve either the fracture toughness or stress corrosion resistance relative to completely martensitic microstructures with equivalent strength.

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Document Details

Document Type
Technical Report
Publication Date
Aug 26, 1970
Accession Number
AD0712723

Entities

People

  • C. S. Carter

Organizations

  • Boeing Commercial Airplanes

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Age Hardening
  • Austenite
  • Chemistry
  • Hardening
  • Heat Treatment
  • Intensity
  • Low Alloy Steels
  • Maraging Steels
  • Materials
  • Mechanical Properties
  • Mechanics
  • Microstructure
  • Stress Corrosion
  • Tensile Properties
  • Tensile Strength
  • Toughness
  • Yield Strength

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Metallurgy
  • Powder metallurgy of Titanium alloys.