Take a sneak peek at the new NIST.gov and let us know what you think!
(Please note: some content may not be complete on the beta site.).
NIST Authors in Bold
|Author(s):||Timothy J. Burns; Steven P. Mates; Richard L. Rhorer; Eric P. Whitenton; Debasis Basak;|
|Title:||Effect on Flow Stress of a Rapid Phase Transition in AISI 1045 Steel|
|Published:||July 13, 2010|
|Abstract:||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:||ASME 2011 International Manufacturing Science and Engineering Conference|
|Dates:||June 13-17, 2011|
|Keywords:||high-speed machining, Kolsky bar, AISI 1045 steel, thermal modeling|
|PDF version:||Click here to retrieve PDF version of paper (239KB)|