Fracture Toughness Degradation in HY-80 and HY-100 After Prestraining.

Abstract

This thesis is the first in a series that is attempting to discover the mechanism by which the fracture toughness J sub 1C, of HY-series steel decreases with increasing prestrain at room temperature. This decrease J sub 1C is a function of yield strength and plane strain fracture strain. However, this reduction in J sub 1C is shown to be caused by a reduction in the plane strain fracture strain. Fractographic examinations have verified this reduction in the fracture strain and also have shown that regions of very low ductility exist due to alloy segregation that is present in bands. The mechanism for the degradation in the toughness is believed to be such that stress relieving following prestraining would restore the toughness. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1983
Accession Number
ADA129427

Entities

People

  • James Neal Mullican

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Electron Microscopes
  • Electron Microscopy
  • Films
  • Fracture (Mechanics)
  • Heat Treatment
  • J Integrals
  • Materials
  • Materials Science
  • Measurement
  • Mechanical Engineering
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Microscopes
  • Modulus Of Elasticity
  • Stress Relieving
  • Yield Strength

Readers

  • Materials Science (Mechanical Engineering).