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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.
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
URL: http://www.asminternational.org/portal/site/www/AsmStore/ProductDetails/?vgnextoid=fb5c5579ee1f9110VgnVCM100000701e010aRCRD
