GLTRS--Glenn
TITLE AND SUBTITLE:
Processing of IN-718 Lattice Block Castings

AUTHOR(S):
Mohan G. Hebsur

REPORT DATE:
April 2002

FUNDING NUMBERS:
WU-714-04-50-00
NCC3-637

PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES):
Ohio Aerospace Institute
22800 Cedar Point Road
Brook Park, Ohio 44142

PERFORMING ORGANIZATION REPORT NUMBER:
E-13140

SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Washington, DC 20546-0001

REPORT TYPE AND DATES COVERED:
Final Contractor Report

SPONSORING/MONITORING AGENCY REPORT NUMBER:
NASA CR-2002-211332

SUPPLEMENTARY NOTES:
Prepared for the 131st Annual Meeting and Exhibition sponsored by The Minerals, Metals, and Materials Society, Seattle, Washington, February 17-21, 2002. Project Manager, Michael Nathal, Materials Division, NASA Glenn Research Center, organization code 5120, 216-433-9516.

ABSTRACT:
Recently a low cost casting method known as lattice block casting has been developed by JAM Corporation, Wilmington, Massachusetts for engineering materials such as aluminum and stainless steels that has shown to provide very high stiffness and strength with only a fraction of density of the alloy. NASA Glenn Research Center has initiated research to investigate lattice block castings of high temperature Ni-base superalloys such as the model system Inconel-718 (IN-718) for lightweight nozzle applications. Although difficulties were encountered throughout the manufacturing process, a successful investment casting procedure was eventually developed. Wax formulation and pattern assembly, shell mold processing, and counter gravity casting techniques were developed. Ten IN-718 lattice block castings (each measuring 15-cm wide by 30-cm long by 1.2-cm thick) have been successfully produced by Hitchiner Gas Turbine Division, Milford, New Hampshire, using their patented counter gravity casting techniques. Details of the processing and resulting microstructures are discussed in this paper. Post casting processing and evaluation of system specific mechanical properties of these specimens are in progress.

SUBJECT TERMS:
Superalloys; Investment casting; Counter gravity processing; Lattice block

NUMBER OF PAGES:
17

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2002/CR-2002-211332.pdf
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