Accession Number : AD0759088

Title :   Environment Enhanced Fatigue Crack Growth in High-Strength Steels.

Descriptive Note : Technical rept.,

Corporate Author : LEHIGH UNIV BETHLEHEM PA INST OF FRACTURE AND SOLID MECHANICS

Personal Author(s) : Wei,R. P. ; Simmons,G. W.

Report Date : MAR 1973

Pagination or Media Count : 61

Abstract : The current state of understanding of the phenomenology and mechanism(s) for corrosion fatigue of high-strength steels is reviewed. Particular attention is directed towards corrosion fatigue in hydrogen and in water/water vapor environments. Available experimental data indicate that fatigue crack growth in high-strength steels is influenced by loading variables, such as frequency, stress ratio and waveform in regions above and below KIscc. The influences of these variables are directly attributed to interactions with the external chemical environment. Possible synergistic interactions and their relation to chemical reaction kinetics are indicated. Pertinent information on oxygen-metal and water-metal reactions is summarized. Initial results from a coordinated program of study for determining the water-metal reaction kinetics and the kinetics of crack growth on a single high-strength steel are discussed. (Author Modified Abstract)

Descriptors :   (*STEEL, *FATIGUE(MECHANICS)), CORROSION, FRACTURE(MECHANICS), CRACK PROPAGATION, ENVIRONMENTAL TESTS, CHEMISORPTION

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE