Research of Fe-Cr alloys properties at high temperature

Four kinds of Fe-Cr ferric alloys were manufactured in this experiment. Their thermal expansion rates at 900°C were between 10-11 × 10-3 (and the rate of sample Fe-Cr-4 was 10.27 × 10-3), which were close to yttrium stabled zirconium (YSZ). Compared with traditional alloy materials, the thermal expansion rate margins were decreasing obviously, resulting in the decrease of thermal stress and the improvement of thermal matching. The electrical resistance of the samples increased smoothly with the increase of temperature. The electrical resistance of these four samples was in the range of 0.95-1.17 × 10-3Ω &middot cm, and sample Fe-Cr-4 was 1.17 × 10-3Ω &middot cm. Sample Fe-Cr-1 and Fe-Cr-4 showed better performance on oxidation resistance, for a 3Cr2O3Fe2O3 oxidation coating was formed on the sample surface and the mass gain tended to be stable with the oxidation operation prolonged. After 455 oxidation hours added up, the mass gain of sample Fe-Cr-1 and Fe-Cr-4 was approximately 0.0002g/g, yet sample Fe-Cr-2 and Fe-Cr-3 above 0.0004g/g.