Changes in the Macrostresses and Microstresses in Steel with Fatigue

Abstract

The residual stresses in both the ferrite and cementite phases of fatigued 1080 steel specimens with pearlite, spheroidite, and tempered martensite microstructures were measured with x-ray diffraction giving both the macrostresses and the microstresses. Specimens with no initial stresses showed little changes with fatigue. Specimens with initial macrostresses and with initial microstresses showed fading of the stresses, the fading being the slowest for the strongest microstructure. Hydrostatic microstresses are present after heat treatment due to the differential thermal properties of the cementite and ferrite.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1991
Accession Number
ADA238946

Entities

People

  • Jerome B. Cohen
  • R. A. Winholtzd

Organizations

  • Northwestern University

Tags

DTIC Thesaurus Topics

  • Coordinate Systems
  • Crystal Structure
  • Diffraction
  • Engineering
  • Equations
  • Heat Treatment
  • Martensite
  • Materials
  • Materials Science
  • Microstructure
  • Pearlite
  • Residual Stress
  • Shot Peening
  • Steel
  • Stresses
  • X Rays
  • X-Ray Diffraction

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.
  • Structural Health Monitoring of Composite Structures.