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STRAIN AGING AND DELAYED FAILURE IN HIGH-STRENGTH STEELS
TRW INC CLEVELAND OH
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Spontaneous strain aging which occurs during tensile testing was examined for several high-strength steels. The results of smooth and notch tensile tests indicated that significant strain aging effects occurred in most high-strength steels in the 300 F to 800 F temperature range and this behavior was analogous to blue brittleness in mild steels. Constant load, stress rupture tests were conducted on the steels to determine the possible relationship between strain-aging embrittlement and delayed failure. Or2y the 300 M steel tested at 400 F exhibited an appreciable degree of delayed failure. This embrittlement, was extremely sensitive to test environment and was elimiriated when tests were conducted in argon. Although strain aging was not a sufficient condition to initiate delayed failure, it appeared to increase the severity of the environmental effects in the particular range where sufficient interstitial mobility existed.
APPROVED FOR PUBLIC RELEASE