KEJZLAR Pavel

Spoluautoři MACAJOVÁ Eva, VOLESKÝ Lukáš, KRATOCHVÍL Petr

Exceptional high-temperature oxidation resistance makes iron aluminides promising candidates to replace Ni-Cr-based stainless steels. On the other hand these alloys suffer from insufficient high-temperature strength. Addition of Zr leads to formation of hard intermetallic phases that increase a high-temperature strength. Correlative microscopy has been used for investigation of the structure in both as cast and annealed state, the high-temperature mechanical strength has been measured in a temperature range from 600 to 950°C. It has been shown that precipitation of Zr-containing τ1 and λ1 phases leads to a significant gain in σ0.2 yield stress; however BTDT shifts to higher temperatures.

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