Porosity in CA6NM Castings
Porosity in CA6NM Castings
(OP)
thread330-217250: Nitrogen in CA6NM
The above thread references Nitrogen solubility in CA6NM. We are having porosity issues in casting with thinner walls (0.5"). I am having our heat tested for nitrogen content. In the mean time can any one comment about what percentage of Nitrogen would cause porosity in CA6Nm castings? Also, if the nitrogen in the heat is higher than desired, is there any way to remove this nitrogen during melting?
Thank you,
The above thread references Nitrogen solubility in CA6NM. We are having porosity issues in casting with thinner walls (0.5"). I am having our heat tested for nitrogen content. In the mean time can any one comment about what percentage of Nitrogen would cause porosity in CA6Nm castings? Also, if the nitrogen in the heat is higher than desired, is there any way to remove this nitrogen during melting?
Thank you,
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There is always some thing better out there...
Mahadhatu





RE: Porosity in CA6NM Castings
Could you describe your melting practice for these castings?
RE: Porosity in CA6NM Castings
We use FeSi, Mn and Fe-Ti as deoxidisers.
--------------------------------------
There is always some thing better out there...
Mahadhatu
RE: Porosity in CA6NM Castings
How are you shielding the alloy during melting?
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Plymouth Tube
RE: Porosity in CA6NM Castings
This problem is evident in CA6NM castings with thinner walls (0.5") and not in thick wall castings. If the same configuration is cast out of something like 316SS we don't have this issue.
If moisture was the main cause, all of out castings should have the same problem which is not the case.
Thank you for your comments.
--------------------------------------
There is always some thing better out there...
Mahadhatu
RE: Porosity in CA6NM Castings
Here is an interesting paper/book to review;
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