Abstrakt
The goal of the experiment is an effort to improve the technological formability of iron aluminides and to find other technological possibilities of forming the aluminides with the aim to contribute to the improvement of inferior formability of iron aluminides. As it is generally known, the iron aluminides feature low elongation at the room temperature.
In laboratory conditions the samples of iron aluminides FeAl with the chemical composition in at%: 40.7Al - 0.15 C - 0.15 Mn - 0.272 B - 0.0065 Mo - 0.15 Ti (remainder Fe) were cast with ultrasound and without annealing. These samples were after heating to 1200 oC subsequently hot upseted in different states.
The first sample was upseted without bandage by a single reduction, the second sample was upseted with an added circumferential ring by a single reduction, and the third sample was upseted entirely wrapped in a capsule, by a single reduction. The last fourth sample was wrapped in the capsule twice and upseted using five stops.
After every reduction the sample was charged into the furnace heated to 1200oC and annealed for 1 minute. All upseted piece cooled in the free air.
After forming the iron aluminides samples, it was evaluated to what extent the various ways of the bandage treatment of the material and procedures of its upsetting could influence spreading, microstructural changes and the origin of cracks at contact surfaces and side faces of the sample.