Abstract
A multiphase TRIP780 steel was subjected to tensile pre-strains of 0, 5, and 15% at room temperature and at −20 °C. The pre-strained specimens were subjected to strain-ontrolled, fully-reversed, axial fatigue testing at strain amplitudes ranging from 0.2 to 0.6%. The low-cycle fatigue life was largely independent of the pre-strain history. Pre-strained specimens had lower plastic strain amplitudes and higher stress ranges in the initial fatigue cycles before converging towards the same values as the specimens with zero pre-strain, due to cyclic strain softening. This suggests that the effects of pre-strain are eventually overcome by accumulated plastic deformation during fatigue cycling.
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Ly, A.L., Findley, K.O. (2014). The Effects of Pre-Straining Conditions on Austenite Stability during Fatigue of Multiphase Trip Steels. In: Srivatsan, T.S., Imam, M.A., Srinivasan, R. (eds) Fatigue of Materials III. Springer, Cham. https://doi.org/10.1007/978-3-319-48240-8_14
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DOI: https://doi.org/10.1007/978-3-319-48240-8_14
Publisher Name: Springer, Cham
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