Environmentally Controlled Fatigue Crack-Growth Rates in SAE 4340 Steel—Temperature Effects

[+] Author and Article Information
J. T. Ryder, J. P. Gallagher

Department of Theoretical and Applied Mechanics, University of Illinois, Urbana, Ill.

J. Basic Eng 92(1), 121-125 (Mar 01, 1970) (5 pages) doi:10.1115/1.3424918 History: Received August 15, 1969; Online October 27, 2010


The temperature dependence of sustained-loading and corrosion-fatigue crack-propagation behavior of SAE 4340 steel immersed in distilled water was investigated using the fracture mechanics approach. During the load cycle, stress-intensity histories had values higher than the static threshold stress intensity (KIscc ). For a stress-intensity range of 20 ksi in., a factor of 30 increase in the corrosion-fatigue crack-growth rate was noted for a temperature increase of 70 deg C. The mechanical variables were found to have much less influence than the environmental reaction rate. In contrast with dry air results, the fatigue crack-growth rate in a distilled water environment was dependent on the mean stress-intensity for stress-intensity histories above KIscc . This dependence varied with temperature level.

Copyright © 1970 by ASME
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