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Effects of Testing Temperature on the Fatigue Behavior of Carburized Steel
Technical Paper
2005-01-0986
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The effects of elevated testing temperature on the fatigue behavior of carburized steel were evaluated by testing modified Brügger bending fatigue specimens at room temperature, 90 °C and 150 °C. SAE 4023, SAE 4320, and SAE 9310 steel were studied to assess the influence of alloy content and stability of retained austenite. Fatigue samples were gas-carburized and tested in air at 30 Hz with a stress ratio of 0.1. An infrared spot lamp was used to heat samples to 90 °C (150 °F) or 150 °C (302 °F) during testing. S-N curves were developed for the room temperature baseline tests as well as elevated temperature tests. The endurance limits determined are as follows: SAE 4023-RT (1170 MPa), SAE 4023-90°C (1140 MPa), SAE 4320-RT (1210 MPa), SAE 4320-90°C (1280 MPa), SAE 9310-RT (1380 MPa), SAE 9310-90°C (1240 MPa). At 150 °C all samples exhibited permanent plastic deformation under the test conditions examined; therefore, it was not possible to obtain meaningful endurance limits at this temperature. The results showed that for all steels, the high stress/low cycle fatigue performance decreased with increased testing temperature. The endurance limit of SAE 9310 steel was most affected by the elevated testing temperature, resulting in a 140 MPa decrease in endurance limit. The endurance limits of the lower alloyed materials, SAE 4023 and 4320 steels, were essentially unaffected by the elevated testing temperature.
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Citation
Turnquist, D., Matlock, D., Speer, J., and Krauss, G., "Effects of Testing Temperature on the Fatigue Behavior of Carburized Steel," SAE Technical Paper 2005-01-0986, 2005, https://doi.org/10.4271/2005-01-0986.Also In
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