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公开(公告)号：WO2014028053A3
公开(公告)日：2014-02-20
申请号：PCT/US2013/031903
申请日：2013-03-15
Applicant: THE TIMKEN COMPANY
Inventor： IMUNDO, John, R., Jr. , BEDEKAR, Vikram, M. , DAMM, Edward, F. , HYDE, R., Scott
Abstract: A steel article with resistance to contact fatigue having a martensitic stainless steel body with a hardened surface layer and a core. The hardened surface layer is tempered martensite and M 7 C 3 carbides, has at least 1.6 wt.% carbon, and has a depth equal to or greater than the depth where the steel article experiences the maximum shear stress when placed in service. Also, a method of manufacturing such as a steel article having resistance to contact fatigue comprising: providing a martensitic stainless steel article having a prior austenite grain size of ASTM #6 or smaller; carburizing the surface of the steel article; solution treating the steel article; tempering the steel article for a first time; hardening the steel article; cooling the steel article at a temperature below 0°F; and tempering the steel article for a second time.
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