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Effect on Flow Stress of a Rapid Phase Transition in AISI 1045 Steel



Timothy J. Burns, Steven P. Mates, Richard L. Rhorer, Eric P. Whitenton, Debasis Basak


New experimental data on AISI 1045 steel from the NIST pulse-heated Kolsky Bar Laboratory are presented. The material is shown to exhibit a nonequilibrium phase transformation at high strain rate. An interesting feature of these data is that the material has a stiffer response to compressive loading when it has been preheated to a testing temperature that is below the eutectoid temperature using pulse-heating than it does when it has been preheated using a slower heating method. On the other hand, when the material has been pulse-heated to a temperature that exceeds the eutectoid temperature prior to compressive loading on the Kolsky bar, it is shown to exhibit a significant loss of strength. A consequence of this behavior is that fixed-parameter constitutive models, such as the well-known Johnson-Cook model, cannot be used to describe this constitutive response behavior. An argument is made that the phase transition does not occur during high-speed machining operations, and suggestions are made as to how to modify the Johnson-Cook model of Jaspers and Dauzenberg for this material in order to obtain improved temperature predictions in finite-element simulations of high-speed machining processes.
Proceedings Title
ASME 2011 International Manufacturing Science and Engineering Conference
Conference Dates
June 13-17, 2011
Conference Location
Corvallis, OR


high-speed machining, Kolsky bar, AISI 1045 steel, thermal modeling


Burns, T. , Mates, S. , Rhorer, R. , Whitenton, E. and Basak, D. (2010), Effect on Flow Stress of a Rapid Phase Transition in AISI 1045 Steel, ASME 2011 International Manufacturing Science and Engineering Conference, Corvallis, OR, [online], (Accessed July 21, 2024)


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Created July 13, 2010, Updated February 19, 2017