Tensile, Fatigue Toughness, and Crack Growth Properties of a Roll-Extruded HP 9Ni-4Co-25C Steel Alloy

Abstract

A section of internal roll-extruded NP 9 Ni-4Co-25C steel alloy was evaluated. Tensile and fracture toughness properties were obtained at room temperature and at -65 deg F. Crack growth properties were obtained at room temperature in laboratory air and in distilled water. An increase in tensile strength and a decrease in ductility were observed to occur with increased cold forming reduction. Fracture toughness properties appeared to decrease with increased rolling reduction. Fatigue crack growth properties in laboratory air were compatible with other high strength steels for the lower delta K values. Fatigue crack growth properties in distilled water showed no acceleration due to aqueous environment influences. Statically loaded stress corrosion cracks (SCC) growth properties were an improvement over available D6ac steel alloy data.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1971
Accession Number
AD0771116

Entities

People

  • Raymond E. Jones

Organizations

  • University of Dayton

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Cold Working
  • Engineering
  • Environment
  • Ferrium
  • Governments
  • Materials
  • Materials Engineering
  • Materials Laboratories
  • Mechanical Properties
  • Mechanical Working
  • Stress Corrosion
  • Stress Corrosion Cracking
  • Stress Intensity Factors
  • Tensile Properties
  • Tensile Strength
  • Yield Strength

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Materials Science and Engineering.