ŚLEBODA Tomasz AGH University of Science and Technology

Spoluautoři ŁUKASZEK-SOŁEK Aneta, BEDNAREK Sylwia

Iron aluminides have been of great interest over the last several decades for possible use as moderate to high temperature structural materials. These alloys are especially attractive because they combine low density with good strength, excellent corrosion and oxidation resistance at elevated temperatures, a wide range of chemical stability, and relatively low costs. The mechanical properties of these alloys, particularly ductility and strength, are microstructure sensitive. In this respect, powder metallurgy (P/M) methods are very promising, since much finer microstructures can be produced. This study evaluates the possibility of P/M FeAl alloys forging, with a special emphasis on the processing parameters. FeAl alloy powder was used in this research. Cylindrical compression specimens were machined from hot pressed powder compacts. Compression tests were performed on Gleeble 3800 simulator to characterize the material behavior under various temperature-strain-strain rate conditions. Next, cylindrical specimens with a height of 10 mm and a diameter of 30 mm were machined from fully-dense compacts and used as a starting material for forging. The specimens were isothermally forged at 900oC on hydraulic press equipped with a specially designed forging dies. The research showed, that properly chosen forging conditions result in obtaining high quality FeAl alloy forgings without necessity of preform “canning”. In addition to the experimental tests, numerical simulations of FeAl alloys forging were performed using QForm software. The boundary conditions for the simulations were determined in the performed experimental tests. The results of the simulations showed to be in very good agreement with the experimental observations.