AN INVESTIGATION OF THE CRACK-PROPAGATION RESISTANCE OF HIGH-STRENGTH ALLOYS AND HEAT-RESISTANT ALLOYS. Bimonthly Progress Report No. 1. December 23, 1960-February 23, 1961

Technical Report · Fri Mar 17 04:00:00 EST 1961

OSTI ID:4790408

Morrison, J D

The crack-propagation characteristics of a number of heat-resistant alloys and high-strength alloys are studied at room temperature and at elevated temperatures using fatigue-cracked specimens. These alloys fall into three general groups, viz. refractory metals, super alloys, and some special high- purity'' steels. Experimental procedures suitable for these alloys are presented. An evaluation of the standard tensile properties and crackpropagation properties of aged A 286 alloy sheet is made. It is found that the net fracture stress of fatigue-cracked specimens of this alloy is intermediate between the yield strength and ultimate strength at temperatures from 75 to about 1000 deg F. At 1500 deg F, the net fracture stress of the fatigue-cracked specimens is somewhat higher than the ultimate tensile strength. (auth)

• Research Organization: Southern Research Inst., Birmingham, Ala.
• NSA Number: NSA-16-012081
• OSTI ID: 4790408
• Report Number(s): AD-260547
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALLOYS
CRACKS
FAILURES
FATIGUE
HEAT RESISTING METALS
HEAT TREATMENTS
HIGH TEMPERATURE
METALS
METALS, CERAMICS, AND OTHER MATERIALS
MOTION
QUALITATIVE ANALYSIS
REFRACTORIES
SHEETS
STANDARDS
STEELS
STRESSES
TEMPERATURE
TENSILE PROPERTIES