what is practical way to modify carbon content in FSX-414 (cast superalloy)? standard composition is (52Co- 29Cr- 10Ni- 7W- 0.25C) but we received scrap by 0.5% C, it should probably remelting in air and then manufacturing by vacuum induction melting (VIM), but how we can reducing carbon to 0.25%?
If you melt this scrap in air, the carbon content will automatically decrease. The problem is that this process is hardly controllable and in addition to carbon, you also oxidize chromium and tungsten.
It is better to carry out a controlled, partial oxidation of the scrap in air at 1000-1100°C than to melt it completely in air.
Vadim Verlotski thank you for your attention, but how can control melting composition?
I would have distributed the amount of scrap in several parts and oxidized it in air for different lengths of time. For the vacuum melt I would have mixed a non-oxidized part of the scrap with a oxidized part (for example 1 to 1) and analyzed the melting result. If the carbon content is still too high, you have to make a mixture with a more oxidized part of scrapat for the second melt or change the mixture not oxidized to oxidized to 1 to 2. You may have to make several melts with different compositions (part not oxidized + part oxidized) to get the correct carbon content.
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