Report
Structure-Property Characterization of Rheocast and VADER Processed IN-lOO, Superalloy
01 Jun 1985
Abstract
Two recent solidification processes have been applied in the production of IN-100 nickel-base superalloy: rheocasting and vacuum arc double electrode remelting (VADER). A detailed microstructural examination has been made of the products of these two processes; associated tensile strength and fatigue crack propagation (FCP) rate at an elevated temperature were evaluated. In rheocasting, processing variables that have been evaluated include stirring speed, isothermal stirring time and volume fraction solid during isothermal stirring. VADER processed IN-100 was purchased from Special Metals Corp., New Hartford, NY. As-cast ingots were subjected to hot isostatic pressing (HIP) and heat treatment. Both rheocasting and VADER processed materials yield fine and equiaxed spherical structures, with reduced macrosegregation in comparison to ingot materials. The rheocast structures are discussed on the basis of the Vogel-Doherty-Cantor model of dendrite arm fragmentation. The rheocast ingots evaluated were superior in yield strength to both VADER and commercially cast IN-100 alloy. Rheocast and VADER ingots may have higher crack propagation resistance than P/M processed material.
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Details
- Title
- Structure-Property Characterization of Rheocast and VADER Processed IN-lOO, Superalloy
- Creators
- Jung-Jen Allen Cheng - Drexel UniversityDiran Apelian - Drexel University
- Publisher
- National Aeronautics and Space Administration
- Resource Type
- Report
- Academic Unit
- Materials Science and Engineering
- Identifiers
- 991022047817004721