Abstract
In this study, the deformation limits of various DP980 steels are examined with the deformation instability theory. Under uniaxial tension, overall stress–strain curves of the material are estimated based on a simple rule of mixture (ROM) with both iso-strain and iso-stress assumptions. Under complex loading paths, an actual microstructure-based finite element (FE) method is used to resolve the deformation compatibilities explicitly between the soft ferrite and hard martensite phases. The results show that, for uniaxial tension, the deformation instability theory with iso-strain-based ROM can be used to provide the lower bound estimate of the uniform elongation (UE) for the various DP980 considered. Under complex loading paths, the deformation instability theory with microstructure-based FE method can be used in examining the effects of various microstructural features on the deformation limits of DP980 steels.
| Original language | English |
|---|---|
| Pages (from-to) | 1046-1051 |
| Number of pages | 6 |
| Journal | JOM |
| Volume | 69 |
| Issue number | 6 |
| DOIs | |
| State | Published - Jun 1 2017 |
| Externally published | Yes |
Funding
The Pacific Northwest National Laboratory is operated by the Battelle Memorial Institute for the U.S. Department of Energy (DOE) under Contract DE-AC05-76RL01830. This work was funded by the DOE’s Vehicle Technologies Office under the Automotive Lightweight Materials Program managed by Ms. Sarah Ollila. The authors acknowledge the help of Dr. Mark Taylor and the Advanced Steel Processing and Products Research Center at the Colorado School of Mines for the experiments.
| Funders | Funder number |
|---|---|
| U.S. Department of Energy | DE-AC05-76RL01830 |
| Battelle | |
| Vehicle Technologies Office |