Secondary-hardening gear steel
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United States of America Patent
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Aug 12, 2014
Grant Date -
Aug 13, 2009
app pub date -
Aug 20, 2008
filing date -
Aug 22, 2007
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Abstract
A case hardened gear steel having enhanced core fracture toughness includes by weight percent about 16.3Co, 7.5Ni, 3.5Cr, 1.75Mo, 0.2W, 0.11C, 0.03Ti, and 0.02V and the balance Fe, characterized as a predominantly lath martensitic microstructure essentially free of topologically close-packed (TCP) phases and carburized to include fine M2C carbides to provide a case hardness of at least about 62 HRC and a core toughness of at least about 50 ksi√in.
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