INVESTIGATION ON NOTCH SENSITIVITY OF HEAT-RESISTANT ALLOYS AT ELEVATED TEMPERATURE. (RUPTURE STRENGTH OF NOTCHED BARS AT HIGH TEMPERATURES)
Stress-rupture tests were conducted on notched and unnotched or plain bars of S-8l6, Inconel ' X'' Type 550, and Waspaloy alloys at test temperatures ranging from 1200 to l600 deg F. The notched specimens had 50%, 60degree, V- notches with the root radii ranging from 0.005 to 0.l00 in. In some tests, as many as three notches of different root radii were used. The test results indicated that S-516 alloy was notch strengthened by all of the notches used, in the temperature range from 1350 to 1600 deg F. Inconel ' X'' Type 550 was always notch strengthened by all of the notches only at the test temperature of l600 deg F. Waspaloy was always notch strengthened by all notches only at the temperature of l500 deg F. Both Inconel X'' Type 550 and Waspaloy could be notch strengthened for some test conditions (notch sharpness and time) at temperatures below l600 and 1500 deg F, respectively. Factors considered to have an influence on stress-rupture behavior were studied and the results are included. the factors investigated are notch geometry, notched and unnotched ductility, the modes of deformation and fracture, metallurgical changes, and surface condition. The influence of some of these factors can vary considerably from alloy to alloy. It does not appear possible, therefore, to evaluate the notch and unnotched stress- rupture behavior of a given alloy completely by any simple method. Rather, an evaluation should be based upon the combined consideration of those factors that are irfluential in each individual case. (auth)
- Research Organization:
- Battelle Memorial Inst., Columbus, Ohio
- NSA Number:
- NSA-12-002349
- OSTI ID:
- 4345673
- Report Number(s):
- WADC-TR-54-391; AD-53655
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINUM ALLOYS
CHROMIUM ALLOYS
COBALT ALLOYS
DEFORMATION
DUCTILITY
FAILURES
HIGH TEMPERATURE
INCONEL ALLOYS
MATERIALS TESTING
METALLURGY
MINERALOGY, METALLURGY, AND CERAMICS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NIOBIUM ALLOYS
RODS
STRESSES
SURFACES
TEMPERATURE
TENSILE PROPERTIES
TITANIUM ALLOYS
TUNGSTEN ALLOYS
WASPALOY