Accession Number:

AD0747700

Title:

Corrosion Fatigue Behavior of 4340 Steel Above K sub I scc

Descriptive Note:

Technical rept.

Corporate Author:

TRW EQUIPMENT LABS CLEVELAND OH MATERIALS TECHNOLOGY DEPT

Personal Author(s):

Report Date:

1972-07-01

Pagination or Media Count:

48.0

Abstract:

The purpose of the program was to study the corrosion fatigue behavior of AISI 4340 in distilled water above K sub Iscc. The results obtained by superimposing fatigue crack growth behavior determined in an inert argon atmosphere onto the environmental contribution determined from sustained load stress corrosion tests indicated that a modification of the Wei-Landes model was required to improve the predictability of the corrosion fatigue behavior. This indicated that the stress corrosion contribution to corrosion fatigue is a complex function of K sub I, particularly at load cycles which are close to K sub Iscc. Activation energies for crack growth in stress corrosion and corrosion fatigue indicate that the kinetics are controlled by the metal-environment reaction occurring at the crack surface.

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE