Steel article having improved contact fatigue resistance and a method of making

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 M7C3 carbides, has at least 1.6 wt.% carbon, and has a depth equal to or greater than the depth where the steel...

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Bibliographische Detailangaben
Hauptverfasser:	DAMM EDWARD F, BEDEKAR VIKRAM M, HYDE R. SCOTT, IMUNDO JOHN R.JR
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS
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Beschreibung
Zusammenfassung:	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 M7C3 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 DEG F; and tempering the steel article for a second time.