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The inert gas atmosphere consists in principle
of a neutral gas and an active gas. Neutral gas has the
purpose to displace disadvantageous elements in the furnace
atmosphere. The active gas has the function to retain the
reductive conditions and to provide a certain carbon activity
of the material to avoid unwanted caburization and decarburization
during the heat treatment process.
Accurate monitoring of the furnace atmosphere
and therefore accurate controlling of gas additions is of
particular importance to the outcome of an inert gas heat
treatment process.
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