Thresholds for Fatigue Initiation and Propagation and Plastic Work in HY80 and HY130 Steels.

Abstract

The effect of tempering temperature on the fatigue crack propagation rate (FCPR) in the low stress intensity range of HY130 austenitized at 815 C was determined. Four treatments giving the same hardness, R.C. 34, were selected: A - 10 hrs at 400 C, B - 5 hrs at 550 C, C - 1 hr at 610 C and D - 1/4 hr at 650 C. Treatment C, the standard treatment for HY130, gave the highest value of stress intensity threshold, Delta Kth, and the lowest propagation rate at Delta K of 5 MPa square root of m. For HY80 intercritical heat treatments were developed to give desired distributions of ferrite and martensite for measurement of Delta Kth.

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Document Details

Document Type
Technical Report
Publication Date
Oct 30, 1981
Accession Number
ADA106946

Entities

People

  • Morris E. Fine

Organizations

  • Northwestern University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aluminum Alloys
  • Crack Propagation
  • Cracks
  • Electron Microscopy
  • Electrons
  • Engineering
  • Hardness
  • Heat Treatment
  • Martensite
  • Materials
  • Materials Science
  • Microstructure
  • Scanning Electron Microscopy
  • Standards
  • Steel
  • Stresses
  • Tempering

Readers

  • Analytical Mechanics
  • Metallurgy
  • Structural Health Monitoring of Composite Structures.