Abstract
The subcritical quenching technique was used in large size gear steels 45CrMnMo and 42CrMo to obtain ferrite and martensite compound structures with different ferrite contents. The effects of ferrite content on the contact fatigue properties of the two gear steels were investigated in systematic contact fatigue tests. The results show an obvious influence of ferrite content on the pitting lives of the tested steels. The pitting lives increase continuously with increasing ferrite content in the structures until they reach peak values with corresponding ferrite contents of 12% and 10% for 45CrMnMo steel and 42CrMo steel respectively.
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