Physical and Numerical Analysis of Extrusion Process for Production of Bimetallic Tubes Page: 40 of 108
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collected by the computer as well. Typical uses for a Gleeble unit include flow stress measurements
as a function of temperature, strain, and strain rate, welding HAZ development simulations,
recrystallization studies, as well as mechanical testing.
For this research, results from FEM simulations are used to simulate the microstructural development
between the stainless and plain carbon steels. Temperature is determined from the billet preheat and
simulation is performed isothermally. Strain and strain rate values have been taken from the interface
in regions of the extrudate that have been examined in the industrially prepared samples. This is used
to verify the feasibility of using the Gleeble to model the process. The maximum strain and strain rate
for the different extrusion conditions are used to model the bond development between the materials
using the Gleeble. This method allows for the simulation of the co-extrusion process to be performed
without using an industrial process. Because of the costs associated with manufacturing multi-
material billets as well as labor and press time, a movement to modeling in preparation of new and
innovative products is underway. Successful and accurate modeling encourages new product
development at lower costs and at a faster rate to final product and market.
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Misiolek, W. Z. & Sikka, V. K. Physical and Numerical Analysis of Extrusion Process for Production of Bimetallic Tubes, report, August 10, 2006; United States. (digital.library.unt.edu/ark:/67531/metadc884646/m1/40/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.