Seiichi Ikeda1, Shigeo Ohashi1 and Goro Ito1
1National Research Institute for Metals, Tokyo
The oxidation resistance of Fe-Al-Cr alloys containing 1 ∼ 3% zirconium in carbon dioxide at temperatures of 600° ∼ 900°C under a pressure of 10 kg/cm2 and mechanical properties of their alloys were studied.
The results were summarized as follows:
(1) The oxidation resistance of Fe-Al-Cr alloys decreased with increase in zirconium content. The oxidation was remarkable especially for the alloys containing 3% zirconium at the testing temperatures of 600° and 700°C.
(2) This violent oxidation phenomenon is attributed to the precipitation of Zr and Cr carbide and internal oxidation of aluminium in the alloys due to carburization from carbon dioxide.
(3) The ductility of the alloy was improved by the addition of zirconium.
(4) The ductility and tensile strength of the tested alloys were highest when they were water quenched from 800°C.
(5) The high temperature creep strength of the alloys were improved with increasing zirconium content.
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