Vlastnosti slitiny Fe-28Al-4Cr z hlediska pouziti pri vysokych teplotach.

The topic of the PhD thesis is the investigation of selected high temperature mechanical properties of the Fe28Al4Cr intermetallic alloy with addition of TiB2 or by cerium, due to its low material costs, good abrasion resistance, cavitation resistance, excellent resistance to oxidation and sulfidation. The specimens have been tested in tension by a tensile test with the following quantities: yield stress Rp0,2, tensile strenght Rm and ductility A, in the temperatures between 20C to 900C for various strain rates. Creep properties have been investigated in material with cerium as additive. Creep tests with continously measured strain have been carried out in the temperature range of 500-900C, and stress range of 5-280 Mpa. The obtained results have been used to determine the minimal strain rate, stress exponent, the activation energy, time and stress to rupture. The structure has been determined using optical and electron microscopy.Available from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi