The Effect of Deformation by Torsion and Subsequent Heat Treatment on the Microstructure of AA6082
dc.contributor.advisor | Holmedal, Bjørn | |
dc.contributor.advisor | Jensrud, Ola | |
dc.contributor.advisor | Makhonya, Sergej | |
dc.contributor.author | Hjorth, Andreas Strande | |
dc.date.accessioned | 2018-12-06T15:01:39Z | |
dc.date.available | 2018-12-06T15:01:39Z | |
dc.date.created | 2018-06-25 | |
dc.date.issued | 2018 | |
dc.identifier | ntnudaim:19341 | |
dc.identifier.uri | http://hdl.handle.net/11250/2576486 | |
dc.description.abstract | An AA6082-aluminum alloy is used in the production of suspension components for cars at Raufoss Technology AS. The components are manufactured through a process of several forming and heating steps. Through torsion testing with subsequent heat treatment, it has been found that the alloy is susceptible to recrystallization during heat treatment following deformation. A linear relationship between the heat treatment temperature and Zener-Hollomon parameter Z and risk of recrystallization is proposed. This relationship suggests that there is a risk of a recrystallized microstructure after post-deformation heat treatment at temperatures above T_(heat treatment) [℃]=1355-30×lnZ. The flow properties of the material during hot working conditions were examined by torsion testing. Constitutive relations are suggested based on the recorded experimental stress-strain curves and strain rate and deformation temperature measurements. The activation energy for hot work is estimated to be Qhw = 170 kJ/mol for the alloy. The experimental data are found to deviate from the suggested constitutive relations at low deformation temperatures (T = 350℃ and T = 400℃) and shear strain rates below 1 s-1. The constitutive relations are generally found to correlate with the experimental data at higher strain rates and deformation temperatures. | |
dc.language | eng | |
dc.publisher | NTNU | |
dc.subject | Materialteknologi (MTMT), Materialutvikling og -bruk | |
dc.title | The Effect of Deformation by Torsion and Subsequent Heat Treatment on the Microstructure of AA6082 | |
dc.type | Master thesis |