The influence of thermomechanical processing and heat treatment on the fatigue resistance and fractographic characteristics of a high-carbon bearing steel.

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Author
Chung, IK Sik
IK Sik, Chung
Date
1979-12Advisor
Boone, Donald H.
Second Reader
McNelley, Perry R.
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Show full item recordAbstract
This study examined the effects of thermomechanical processing
and subsequent conventional heat treatment on microstructure
and fatigue in AISI 52100 steel. The thermomechanical
processing techniques are essentially those described by Sherby
and his co-workers at Stanford University. Previous research
by that group and at the Naval Postgraduate School has demonstrated
that a wide range of ferrite matrix grain sizes and
carbide particle distributions can be obtained in this steel.
Studies parallel with this are examining the subsequent heat
treatment response of these structures and also the fracture
toughness attainable. In this study on fatigue, it was found
that both the fatigue life at a given cyclic stress and the
endurance limit were improved by processing to produce an
ultra-fine grained ferrite-carbide microstructure prior to
heat treatment. Improvement in fatigue resistance was especially
pronounced when the material was heat treated to fine Bainitic,
rather than Martensitic microstructures . These improvements
are postulated to result from changes in crack propagation
mode and improved resistance to fatigue crack propagation.
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