The Effect of Manganese Phosphate Coatings on Fatigue Crack Initiation

Abstract

The effect of a manganese phosphate coating on the fatigue crack initiation life of ASTM A723 high strength steel was determined. The phosphate coating process creates pitting (stress concentrators) on the surface that cause a dramatic reduction in crack initiation life. This deleterious effect on fatigue life increases as the applied stress level decreases. Keywords: Crack Initiation, Fatigue, High strength steel, Manganese phosphate, Shot peening.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1990
Accession Number
ADA224931

Entities

People

  • John H. Underwood
  • Richard Farrara

Organizations

  • United States Army Armament Research, Development and Engineering Center

Tags

Communities of Interest

  • Cyber
  • Weapons Technologies

DTIC Thesaurus Topics

  • Chemical Composition
  • Engineering
  • Fatigue Life
  • Ferrium
  • Manganese
  • Materials
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Metals
  • Military Research
  • Phosphate Coatings
  • Shot Peening
  • Stress Concentration
  • Surface Properties
  • Surface Roughness
  • Yield Strength

Fields of Study

  • Education
  • Materials science

Readers

  • Metallurgy
  • Structural Health Monitoring of Composite Structures.
  • Surface Coatings Technology.