Metal treatment – Process of modifying or maintaining internal physical... – With casting or solidifying from melt
Patent
1997-02-25
1999-07-13
Yee, Deborah
Metal treatment
Process of modifying or maintaining internal physical...
With casting or solidifying from melt
1641221, 1641222, 164 551, 164 561, C22C 102
Patent
active
059221488
ABSTRACT:
Directionally solidified superalloy components having a bulk sulfur concentration of less than 1 part per million by weight are provided by vacuum melting a charge to form a superalloy melt, desulfurizing the melt by contact with a calcium-bearing desulfurizing agent for a time to reduce sulfur concentration of the melt to less than 1 ppm by weight, casting the melt directly or following solidification and remelting in a ceramic investment mold, and directionally solidifying the melt as cast components without adverse bulk sulfur pick-up subsequent to desulfurization to provide castings having a sulfur content below 1 ppm, such as in the range of hundreds of parts per billion to provide significantly improved oxidation resistance.
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Bierstine Donald L.
Cole Gail R.
Irvine Jeffrey D.
Kunkle John P.
Mihalisin John R.
Howmet Research Corporation
Yee Deborah
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