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5. Parameters controlling gassing porosity on castings
The sudden change in hydrogen solubility in the metal during solidification is responsible for the gassing defects that can appear in castings (figure 8 ).
The formation of this type of defect depends, first and foremost, on the hydrogen content of the bath, but also on other factors which we will now examine.
5.1 Porosities due to gassing. Hydrogen-oxide interactions
The phenomenon of porosity formation, like many metallurgical phenomena, involves germination and growth processes. Indeed, even a well-degassed alloy still contains 0.1 Ncm 3 of H 2...
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Parameters controlling gassing porosity on castings
Controlling gassing problems: degassing treatments
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