| 摘要 |
<p>Nucleated casting systems and methods comprise form castings under reduced pressure. The casting system forms a casting comprising a liquidus portion that receives the refined liquid metal and a solidified portion, the casting further comprising a fine-grain, homogeneous microstructure that is essentially oxide- and sulfide-free and segregation defect free. The casting system comprises a source of refined liquid metal, the refined liquid metal having oxides and sulfides refined out of the metal; a reduced pressure system that provides a reduced pressure to at least a portion of the casting system; and a nucleated casting system for forming the casting. The reduced pressure system provides a sufficient reduced pressure for reducing entrapped air from the liquidus portion of the casting.</p> |
