Fatigue Crack Growth Behavior of Four High Strength Steels in Two Humid Environments. Part I,

Abstract

Fatigue crack growth rates (da/dN) as a function of applied stress intensity amplitude (delta K) were determined for four high strength steels (HP 9-4-.45, 18% Ni marage 250, D6Ac, AISI 4340) in air at 10 percent and at 80 percent relative humidities (R.H.). All four steels demonstrated sensitivity to high humidity with crack growth rates in 80 percent R.H. air being one and one-half to two times as high as in 10 percent R.H. air. Overall crack growth rates of three steels, HP 9-4-.45, 18% Ni marage 250, and D6Ac, were similar, while rates for AISI 4340 were uniformly higher than those of the other three steels. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jan 29, 1971
Accession Number
AD0725470

Entities

People

  • Arthur R. Fletcher
  • C. E. Neu

Organizations

  • Naval Air Warfare Center Warminster

Tags

DTIC Thesaurus Topics

  • Amplitude
  • Biological Phenomena
  • Climate
  • Ecological And Environmental Phenomena
  • Environment
  • Ferrium
  • High Humidity
  • Humidity
  • Intensity
  • Sensitivity
  • Steel

Readers

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