Numerical Simulation of Gleeble Torsion Testing of HSLA-65 Steel
Abstract
NSWCCD has used a Gleeble thermomechanical simulator as a tool to provide carefully controlled deformation cycles on metallurgical samples to study the properties and physics of friction stir welds. Our Gleeble experiments provide critical information that cannot be obtained from experimental friction stir welds because the metallurgical state can change radically with position due to the extreme thermal and strain field gradients within a friction stir weld. This allows us to independently vary strain and temperature with time in ways that may not even be possible under normal friction stir welding conditions. NSWCCD is now analyzing Gleeble torsion samples as part of an ILIR project to gain a fundamental understanding of microstructural evolution during friction stir welding of HSLA-65 steel for Naval applications. NSWCCD developed a numerical model of the Gleeble torsion test to predict the deformation behavior of a specimen to a high degree of fidelity, and provide detailed quantitative information about the strain, strain rate, and temperature history with time throughout the volume of the specimen. The numerical model was necessary to determine the complex thermomechanical distribution within the sample in order to interpret the test results. This numerical model is being used as part of the continuing ILIR project to relate different torsion sample microstructures and properties to their actual thermomechanical histories for comparison with actual friction stir welds. We now have a material model for the high temperature deformation of HSLA-65 that can be used for future DEFORM simulations.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 2008
- Accession Number
- ADA494364
Entities
People
- David R. Forrest
- Matthew F. Sinfield
Organizations
- Naval Surface Warfare Center Carderock Division