Accession Number:

AD0260547

Title:

AN INVESTIGATION OF THE CRACK-PROPAGATION RESISTANCE OF HIGH-STRENGTH ALLOYS AND HEAT-RESISTANT ALLOYS

Descriptive Note:

Corporate Author:

SOUTHERN RESEARCH INST BIRMINGHAM ALA

Personal Author(s):

Report Date:

1961-03-17

Pagination or Media Count:

1.0

Abstract:

IN THE PROGRAM OUTLINED, THE CRACK-PROPAGATION CHARACTERISTICS OF A NUMBER OF HEAT-RESISTANTALLOYS AND HIGH-STRENGTH ALLOYS WILL BE DETERMINED AT ROOM TEMPERATURE AND AT ELEVATED TEMPERATURES USING FATIGUE-CRACKED SPECIMENS. A listing of these alloys, which fall into three general groups, is given. These groups are refractory metals, super alloys, and some special high-purity steels. Details of the experimental procedures to be used for these alloys are presented. An evaluation of the standard tensile properties and crack-propagation properties of aged A 286 alloy sheet, 0.040 in. thick, was made. It was found that the net fracture stress of fatigue-cracked specimens f this alloy is intermediate between the yield strength and ultimate strength at temperatures from 75 F to about 1000 F. At 1500 F, the net fracture stress of the fatigue-cracked specimens was somewhat higher than the ultimate tensile strength. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE