High Strength, High Toughness Rotating Shaft Material
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United States of America Patent
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Issued Date -
Jan 1, 2009
app pub date -
Jun 26, 2008
filing date -
Jun 26, 2007
priority date (Note) -
Abandoned
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Abstract
An age hardenable, martensitic steel alloy that provides high strength, high toughness, and good low cycle fatigue life and a method of making same are disclosed. The alloy comprises a matrix having a weight percent composition consisting essentially of aboutand the balance being iron and usual impurities. The alloy further contains a plurality of inclusions dispersed in the alloy matrix. The inclusions comprise calcium compounds that are about 0.4 μm to about 7.0 μm in major dimension, they have a median size of at least about 1.6 μm in major dimension, and the inclusions contain essentially no rare earth elements.
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