Abstract
	The simplified models of deformation resistance of iron aluminides alloyed with 16.5 and 18.4 wt. % Al; 3.96 and 4.9 wt. % Cr were developed depending on temperature and strain. Two chemically similar melts with different content of Ti (0.24 and 0.61 wt. %) and B (0.089 and 0.070 wt. %) were studied. One with addition of TiB2 powder (needles up to 10 ?m) and the other with addition of Ti and B. It results from stoichiometric relations that the speech is about intermetallic compounds with 28.9 at. % Al (IMC 1), or with 31.7 at. % Al (IMC 4). For experiment the flat samples with graded in size thickness were used. An advantage of the sample with thickness graded in size consists in a three times higher quantity of data achieved by its rolling at exactly defined temperature as compared with rolling of one flat sample with a constant thickness. Each sample was measured and afterwards directly heated in an electric resistance furnace to the rolling temperature (900 – 1200 °C). For each sample the following parameters were changed: temperature, roll gap adjustment (i.e. total deformation of the particular step of the sample) and nominal revolutions of rolls – they determine the achieved strain rate. After cooling down of the rolling stock, width and thickness of individual steps were also measured. Deformation resistance was calculated from the rolling force values which were measured on laboratory mill Tandem. By means of the statistical software Unistat 5.5 and thanks to his capability to treat experimental data to the form of suggested equation by method based on non-linear regression, the constants in the proposed equation were calculated.