بررسي اثر نورد گرم بر مقاومت الكتريكي و مقاومت به اكسيداسيون دما بالاي آلياژ Fe-21%Cr-5.3%A1

Investigation on the effect of hot rolling on the electrical resistivity and high temperature oxidation resistance of Fe-21%Cr-5.3%Al alloy

In this research the oxidation and electrical resistance of Fe-21%Cr-5.3%Al casting and rolling alloy at various times and temperatures were studied. Some of the specimens were casted and heated at 1100, 1200, 1300 and 1400°C temperatures. The Cast and 40% hot rolled specimens were also heated at 1300 and 1400°C temperatures. Both specimens were heated under air atmosphere up to 100 hours. After this oxidation process, their electrical resistivity of the alloy was measured. The oxidation of specimens was decreased due to the rolling process. This decrease was about 12.5% after 72 hours oxidation at 1300°C. The electrical resistivity of rolled samples was more than cast samples. At low temperatures only one oxide layer formed on the alloy but another A1203 layer was formed on the previous layer with increase of the temperature. Keywords: Oxidation, electrical resistance, kanthal, Fe-Cr-Al alloy