Study of microstructural characteristics of Ni-based superalloys at high temperatures. Semiannual technical report

Technical Report · Tue Nov 01 00:00:00 EST 1988

OSTI ID:6231520

Lal, R B; Aggarwal, M D

The microstructural characteristics of the Ni-based superalloy MAR-M246(Hf) which is used in manufacturing the components of the Space Shuttle's main engine have been studied. These superalloys need optimal heat treatment to get the best results. To find the optimum heat treatment the technique of differential thermal analysis and the optical photomicrographs are being planned to be utilized. In the first phase, the existing experimental equipment like cutting, grinding/polishing machines and metallurgical microscope have been set up to cut/polish and take the photomicrographs. In the beginning of this year an order was placed for the Leitz Mettalux-3 microscope with a hot stage for in-situ observation of the superalloy samples. The hot stage was tested for the first time, alloying the thermocouple with the Tantulum heating element and has not been installed finally by the supplier. A Perkin Elmer Differential Thermal Analyzer (DTA 1700) was procured in the first year of the project. Samples of MAR-M246(Hf), MAR-M247, Waspaloy, Udimet-41, CMSX-2 and CMSX-3 (polycrystalline and single crystals) have been studied using differential thermal analyzer.

• Research Organization: Alabama A and M Univ., Normal, AL (USA)
• OSTI ID: 6231520
• Report Number(s): N-89-13554; NASA-CR-183377; NAS-1.26:183377; AAMU-NAG-002
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOY-MAR-M246
HEAT TREATMENTS
MICROSTRUCTURE
NICKEL BASE ALLOYS
THERMAL ANALYSIS
PHOTOMICROGRAPHY
POLYCRYSTALS
PROGRESS REPORT
ALLOYS
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
COBALT ALLOYS
CRYSTAL STRUCTURE
CRYSTALS
DOCUMENT TYPES
MOLYBDENUM ALLOYS
NICKEL ALLOYS
PHOTOGRAPHY
TANTALUM ALLOYS
TITANIUM ALLOYS
TUNGSTEN ALLOYS
360102* - Metals & Alloys- Structure & Phase Studies