Analyse des Umformverhaltens eines Dispersoid verstärkten Materials

For future utilization in high-temperature environments, oxide-dispersion-strengthened (“ODS”) materials seem to be a promising option. Modern aircraft turbines for example, must withstand ever higher temperatures due to alternative fuel. However, there are still challenges in the manufacturing process for industrialized quantities of these materials. For the consolidation of these mechanical alloyed materials, rolling the milled powder is an option. The aim of this thesis is to predict a possible consolidation process by using software for material deformation simulation.
First, rolling tests were being carried out as a basis for conducting the simulation. In these tests, a powder of mechanical alloyed Fe-10Al-4Cr-4Y2O3 was hot rolled and compressed in three rolling passes. The powder itself was contained in a capsule made from S235. To prevent chemical reactions, the powder was filled into that capsule under vacuum, and the capsule was welded closed. For easier separation of the finished product and the capsule, the S235 was coated in aluminium oxide. Before each rolling step, the capsule with the powder inside was heated to 940 °C.
The hot rolling passes were then simulated using the simulation software Simufact. To validate the outcome, the simulation goal was configured to meet the forces applied to the rolling mill and measured during the rolling passes. With this setup, findings regarding effective plastic strain and effective plastic strain rate were obtained and evaluated. These results shall help to better understand the characteristics of the consolidated material, and, ultimately, guide future industrial manufacturing use cases for this special material.