| 摘要 |
<p>Titanium based and nickel based castings are made by casting a suitable melt having a relatively low melt superheat into a mold cavity (13) defined by one or more low carbon steel or titanium mold members where the melt solidifies to form the desired casting. The melt superheat is limited so as not to exceed about 150 °F above the liquidus temperature of the particular melt being cast. For a steel mold (10), one or more titanium melt inlet-forming members (14) are provided for cooperating with the steel mold members (12) to form a melt ingate (18) that communicates to the mold cavity for suppliyng the melt thereto in a manner to avoid harmful iron contamination of the melt during casting. The mold body-to-mold cavity volume ratio is controlled between 10:1 to 0.5:1 to minimize casting surface defects and mold wear/damage.</p> |
