Reoxidation inclusions form in steels & stainless steels during mold filling as the metal comes into contact with the atmosphere in the mold. As the surface of the liquid metal is exposed to oxygen, the liquid metal will oxidize & form reoxidation inclusions. MAGMAsteel is able to track the formation, growth & movement of reoxidation inclusions. This helpful prediction can be used to design gating systems & select process parameters that will minimize the damage these harmful defects can cause - poor mechanical properties, failures in service, and costly rework & scrap.
Reoxidation Inclusion Modeling
The reoxidation inclusion modeler in MAGMAsteel evenly spaces very small inclusion particles on the surface area of the melt front during each time step of the simulation. As these particles remain in contact with the atmosphere, the oxygen that they contact will cause them to grow. The longer the inclusion particles are in contact with oxygen, the larger they will grow. The particles within the model will also agglomerate or grow as they bump into each other.
This model can be useful for testing different gating approaches to see which approach will minimize inclusion growth and/or ensure that the larger inclusions end up in the runner system, risers or flow offs instead of in critical areas of the casting.
Stainless Steel Investment Casting Case Study
The stainless steel investment casting and the gating system used to produce it below demonstrate how the reoxidation inclusion modeler can be used to test different variables in the casting process to eliminate the scrap and rejects caused by this defect.