Accession Number:

AD0294396

Title:

STRAIN AGING AND DELAYED FAILURE IN HIGH-STRENGTH STEELS

Descriptive Note:

Corporate Author:

TRW INC CLEVELAND OH

Personal Author(s):

• Steigerwald, E. A.
• Hanna, G. L.

Report Date:

1962-11-01

Pagination or Media Count:

57.0

Abstract:

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.

Descriptors:

• *STRESS TESTING
• *STAINLESS STEEL
• TEMPERATURE
• MECHANICAL PROPERTIES
• DEFORMATION
• FATIGUE(MECHANICS)
• CONTROLLED ATMOSPHERES
• FAILURE(MECHANICS)
• HIGH STRENGTH ALLOYS
• TENSILE PROPERTIES
• AGING(MATERIALS)
• REACTION KINETICS

Subject Categories:

• Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE