Wear resistant cast iron rocker arm and method of making same
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United States of America Patent
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Nov 17, 1992
Issued Date -
N/A
app pub date -
Apr 21, 1992
filing date -
Aug 17, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A wear-resistant cast iron rocker arm or similar machine element is formed by differential pressure, countergravity casting an iron melt of low superheat into a ceramic investment shell mold maintained initially at room temperature and rapidly solidifying the melt therein to provide a wear-resistant, as-cast microstructure throughout the body of the element. The as-cast microstructure comprises a dendritic constituent of austenite or transformed austenite (e.g., pearlite) depending on alloy composition and an interdendritic carbide constituent. Interdendritic ledeburite will also be present if the austenite remains untransformed. The as-cast microstructure of the rocker arm is devoid of graphite.
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