Corrosion Fatigue Behavior of 4340 Steel Above K sub I scc
TRW EQUIPMENT LABS CLEVELAND OH MATERIALS TECHNOLOGY DEPT
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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.
- Properties of Metals and Alloys