Turbine wheel with integral DS blades and equiaxed hub
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United States of America Patent
Stats
-
Mar 13, 1984
Issued Date -
N/A
app pub date -
Jul 31, 1980
filing date -
Apr 17, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A cast metal turbine wheel is made comprising a cylindrical disc with equiaxed grains and integral blades with columnar grains oriented substantially parallel to the leading and trailing blade edges. The blades are solidified unidirectionally by withdrawing heat through chill means located adjacent the mold at the blade tips. Cooling is inhibited from other blade surfaces by retaining cast metal in mold portions located above and below the blades. The disc portion of the mold is insulated so that it cools slowly to promote grain nucleation throughout the metal therein and equiaxed grain growth.
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