Method of forming product having globular microstructure
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United States of America Patent
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Mar 24, 1998
Grant Date -
N/A
app pub date -
Jun 6, 1995
filing date -
Jun 6, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A temperature profile is determined of a metal sample for the metal to be converted to establish a temperature range indicative of a partially solid and partially liquid state of the metal. With this temperature profile, a metal preform is heated at a controlled rate from a temperature below the temperature range to a temperature within the range defined by the temperature profile to achieve a select percent by volume of liquid in the metal. This controlled heating to a desired temperature, which may be at a uniform rate, followed by holding at the desired temperature, thermally converts a dendritic structure of the material into a globular structure. The thermally converted metal preform is then recovered for subsequent use such as shaping into a desired article.
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