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Characterization of Retained Austenite in Case Carburized Gears and Its Influence on Fatigue Performance

Lookup NU author(s): Professor Brian Shaw, Dr Fouad Abudaia, Emeritus Professor Terry Evans


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Carburised helical gears with high retained austenite were tested for surface contact fatigue. The retained austenite before testing was 60% and was associated with low hardness near the surface. However, the gears showed good pitting resistance, with contact fatigue strength greater than 1380 MPa. Detailed examination carried out on a gear that had been tested in contact on one flank, on each tooth, in a back-to-back, test revealed that about 50% of the initial retained austenite was transformed to martensite during the test. Transformation was stress or strain assisted and was limited to a thin layer of 10μm thickness or less at the surface. The increase in surface contact fatigue strength is attributed to the increased hardness in the mechanically transformed layer.

Publication metadata

Author(s): Shaw BA; Evans JT; Abudaia FB

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: HeatTreating 2000: Proceedings of the 20th Conference

Year of Conference: 2001

Pages: 62-69

Publisher: Materials Information Society