Creep-rupture behavior of candidate Stirling engine alloys after long-term aging at 760/sup 0/C in low-pressure hydrogen
Nine candidate Stirling automotive engine alloys were aged at 760/sup 0/C for 3500 h in low pressure hydrogen or argon to determine the resulting effects on mechanical behavior. Candidate heater head tube alloys were CG-27, W545, 12RN72, INCONEL-718, and HS-188 while candidate cast cylinder-regenerator housing alloys were SA-F11, CRM-6D, XF-818, and HS-31. Aging per se is detrimental to the creep-rupture and tensile strengths of the iron-base alloys. The presence of hydrogen does not significantly contribute to strength degradation. Based on current MOD 1A Stirling engine design criteria of a 55% urban - 45% highway driving cycle; CG-27 has adequate 3500 h - 87/sup 0/C creep-rupture strength and SA-F11, CRM-6D, and XF-818 have adequate 3500 h - 775/sup 0/C creep-rupture strength.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
- DOE Contract Number:
- AI01-77CS51040
- OSTI ID:
- 6793477
- Report Number(s):
- DOE/NASA-51040-55; NASA-TM-83676; ON: DE84013537
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330201* -- External Combustion Engines-- Stirling Cycle
36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
AGING
ALLOY-HS-31
ALLOYS
CARBON ADDITIONS
CHROMIUM ALLOYS
COBALT ALLOYS
COBALT BASE ALLOYS
CREEP
ENGINES
FAILURES
HAYNES 188 ALLOY
HEAT ENGINES
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCONEL 718
INCONEL ALLOYS
IRON ALLOYS
MANGANESE ADDITIONS
MANGANESE ALLOYS
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
RUPTURES
SILICON ADDITIONS
SILICON ALLOYS
STELLITE
STIRLING ENGINES
TESTING
TUNGSTEN ALLOYS