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Abstract:
Increasing usage of Nickel-based super alloys in aerospace, power plant and nuclear
reactors has made it necessary to model fluid flow during casting process. It is crucial
to measure thermo-physical properties of these alloys accurately for this modelling
purpose. Ni-based single crystal super alloy CMSX-4 plus were investigated for mass
evaporation to analyze the mass loss using ... read moreElectro Static Levitation (ESL) method. Two
models were developed to predict the mass loss & dynamic mass during each thermal
cycle. The first model predicts the rate of mass evaporation in ideal case where the
evaporation is maximum with a correction factor. The second model predicts the mass
evaporation with a correction of Aluminum activity which was calculated by evaluating
the results from elemental analysis for Al, Cr, Ti, and Co. Both the models were applied
and compared with the data obtained from another super alloy CMSX-10K using ESL. The
models were also applied to CMSX-10K processed in Electro Magnetic Levitation (EML) to
compare its accuracy for different sample size. Both models are not viable for analyzing
space data yielding significant error. The 2nd model predicts the mass evaporation for
Al & Co within ±6 % errors for CMSX-4 plus samples processed in
ESL.
Thesis (M.S.)--Tufts University,
2018.
Submitted to the Dept. of Mechanical
Engineering.
Advisor: Douglas
Matson.
Committee: Iryna Zenyuk, and Robert
Peattie.
Keywords: Mechanical engineering, and
Materials
Science.read less
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