Creep-rupture behavior of candidate Stirling engine iron superalloys in high-pressure hydrogen. Volume II. Hydrogen creep-rupture behavior
The creep-rupture behavior of nine iron-base and one cobalt-base candidate Stirling engine alloys was evaluated at 650 to 925/sup 0/C in 15 MPa H/sub 2/ and air. The test alloys included six wrought alloys for tube application (CG-27, N-155, 19-9DL, 12 RN72, INCOLOY Alloy 800H, and A-286) and four cast alloys for cylinders and regenerator housing (SA-F11, HS-31, CRM-6D, and XF-818). Two heats of CRM-6D and XF-818 were tested in two different heat treated conditions - CRM-6D (aged vs braze-cycled) and XF-818 (as-cast vs braze-cycled), and SA-F11 and HS-31 with braze-cycle treatment only. Rupture life, minimum creep rate, and time to 1% strain data were analyzed using Orowan-Sherby-Dorn temperature-compensated technique, and the 3500-h rupture life stress and stress to obtain 1% strain in 3500 h were estimated. The analysis indicated that tube alloys CG-27, N-155, and 19-9DL meet the design stress level of 28 MPa for 3500-h rupture life at 870/sup 0/C in 15 MPa, H/sub 2/, and cast alloys HS-31 (braze-cycled), CRM-6D (aged), and SA-F11 (braze-cycled) also adequately meet the design stress of 119 MPa for 3500-h rupture life at 775/sup 0/C in 15 MPa H/sub 2/ for MOD 1A Stirling engine design criteria. The hydrogen environment had no significant adverse effect, compared to air, on 3500-h rupture life stress and stress to obtain 1% creep strain in 3500-h or on minimum creep rates, and in a few cases, a positive effect was noted. However, ductility was adversely affected in hydrogen environment, more for the tube alloys than for the cast materials.
- Research Organization:
- IIT Research Inst., Chicago, IL (USA)
- DOE Contract Number:
- AI01-77CS51040
- OSTI ID:
- 6849128
- Report Number(s):
- DOE/NASA-0303-1; NASA-CR-174705; ON: DE84015152
- Country of Publication:
- United States
- Language:
- English
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36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOY-A-286
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
CREEP
ELEMENTS
ENGINES
FAILURES
HEAT ENGINES
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH TEMPERATURE
HYDROGEN
INCOLOY 800
INCOLOY ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NONMETALS
RUPTURES
STIRLING ENGINES
TESTING
TITANIUM ALLOYS
VERY HIGH TEMPERATURE