Accession Number:

AD0292902

Title:

FRACTURE CHARACTERISTICS OF STRUCTURAL METALS

Descriptive Note:

Corporate Author:

TRW INC CLEVELAND OHIO

Personal Author(s):

Report Date:

1962-12-31

Pagination or Media Count:

1.0

Abstract:

Results are obtained from smooth and notch tensile tests conducted on the 18 Ni maraging steels. A significant difference in smooth strength properties existed between two heats of the 250,000 psi grade of maraging steel 7 Co. This difference in strength could be correlated to differences in C and Ti content. Plane strain fracture toughness values determined by resistance measurements for one heat of the 7 Co steel over test temperatures ranging from -100 to 300 F indicated that this parameter varied from approximately 150,000 to 130,000 psi-in. to the 12 power. Plane strain fracture toughness determined for two heats of 9 Co maraging steel in sheet form 300,000 psi grade indicated very little variation as a function of test temperature in the -100 to 300 F range. Heat 1 had a mean value of 116,000 psi-in. to the 12 power with a standard deviation of 3150 psi-in. to the 12 power while heat 2 had a mean value of 110,000 psi-in. to the 12 power with a standard deviation of 7130 psi-in. to the 12 power. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE