Temper Embrittlement in a Thick-Wall Gun Tube Steel.

Abstract

An investigation was undertaken to determine the reversibility and susceptibility to temper embrittlement in large 3Ni-Cr-Mo alloy gun tube forgings. The effect of time at temperature in the temper-brittle range was determined. In addition, the effect of microstructure on temper embrittlement was also studied. The degree of embrittlement was based on the change in the fracture appearance transition temperature. It was found that the transformation causing embrittlement is a reversible reaction and that tempering a martensitic structure above 1000F produced no embrittlement. Retempering at a lower temperature can cause embrittlement without a significant change in the yield strength or Charpy impact energy. In tempered martensite, the ductile brittle transition appears to be a function of the yield strength. (Author)

Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1972
Accession Number
AD0754538

Entities

People

  • Richard S. Defries

Tags

DTIC Thesaurus Topics

  • Alloys
  • Ductile Brittle Transition
  • Embrittlement
  • Martensite
  • Microstructure
  • Reversible
  • Steel
  • Tempering
  • Thick Walls
  • Transition Temperature
  • Transitions
  • Walls
  • Yield Strength

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Mechanical Engineering/Mechanics of Materials.