Effect of Austempering Temperature on High Cycle Fatigue Behavior of an Austempered Ductile Iron (ADI)

Sasan Yazdani; Amir Sadighzadeh Benam; Behzad Avishan

doi:10.4028/www.scientific.net/KEM.457.493

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 457Effect of Austempering Temperature on High Cycle...

Effect of Austempering Temperature on High Cycle Fatigue Behavior of an Austempered Ductile Iron (ADI)

Abstract:

Ductile irons with chemical compositions of Fe-3.6%C-2.6%Si-0.50%Cu-0.51%Ni were cast into standard keel blocks. Austenitizing heat treatment was carried out on test pieces at 875°C followed by austempering at 320, 365 and 400°C for times within the austempering processing window in a salt bath furnace. Rotating bending fatigue tests were performed with Roell Amsler UBM 200™ equipment at 3500 rpm at room temperature. Metallography and X-ray diffraction techniques were used to evaluate the fatigue life. Results indicate an increase of 10, 20 and 24% in fatigue life for specimens austempered at temperatures of 320, 365 and 400°C respectively, compared to that of as cast samples. According to the XRD test results; there is an increase in volume fraction of high carbon austenite by increasing the austempering temperature.

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Periodical:

Key Engineering Materials (Volume 457)

Pages:

493-498

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.457.493

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Online since:

December 2010

Authors:

Sasan Yazdani, Amir Sadighzadeh Benam, Behzad Avishan

Keywords:

Austempered Ductile Iron, Fatigue, Microhardness, X-Ray Diffraction (XRD)

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