Comparative oxidation study of un-coated and coated CMSX- 4 and CMSX-486 single crystal superalloys
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Date
2013-02-21
Authors
Smith, Mathew
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Abstract
Microstructural comparison of the isothermal oxidation performance of an
experimental Ni-5Cr-15Al overlay coating applied to CMSX-4 and CMSX-486 was
performed at 1100 ℃. High temperature oxidation was carried out in a box furnace for a
maximum duration of 192 hrs. Samples were periodically removed and the oxide, coating
and substrates microstructurally analyzed using SEM, EDS and XRD equipment. Uncoated
CMSX-4 and CMSX-486 were also oxidized using the same conditions in an
attempt to understand how the coating affected oxidation performance based on
microstructural changes. Results show that both CMSX-4 and CMSX-486 have
unacceptable oxidation characteristics in the un-coated condition, where CMSX-486 had
significantly better performance than CMSX-4. However, in the coated condition, both
CMSX-4 and CMSX-486 had no significant difference in oxidation performance. It was
found, in the un-coated and coated conditions, that the role of Hf in CMSX-486 played a
significant role in determining oxidation performance of the material.
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Keywords
CMSX-4, CMSX-486, Overlay Coating, Oxidation, Superalloy, Single Crystal