Effects of Yttrium on the Oxidation Behavior of Low Sulfur Content Fe–Cr–Al Alloys for Heat Resistant Wires

High temperature oxidation behavior of heat resistant steel with rare earth element Ce

“…Figure 6 illustrates typical three-dimensional AFM features of the experimental specimens after exposure to air at 900°C for different time. The atomic force microscope is a three-dimensional characterization of the microscopic surface of the materials, the area of the oxide film studied is only 50×50 μm 2 , and the different heights of the oxide are described by color changes [20,31]. It can be clearly seen from the results that the threedimensional morphologies of specimens after oxidation under different time are very different.…”

The influence of Y and Nb addition on the corrosion resistance of Fe-Cr-Al-Ni model alloys exposed to oxygen-containing molten Pb

“…Y and Nb have significant positive influence on the corrosion resistance and the phase composition of the alloys.small amounts of other elements can also be added to optimize the properties (e.g. mechanical, corrosion resistance, structure stability) for applications, for instance, stabilize the austenite structure (C, Cu, Mn), precipitate the minor secondary phases (Nb, Ti), increase scale adherence (Y), strengthen the austenite (W, Mo) and its grain boundaries (B) [17][18][19][20][21][22][23][24][25][26][27][28][29].Recent research results indicate that alumina forming austenitic (AFA) model alloys with the chemical composition formula Fe-(20-29)Ni-(15.2-16.5)Cr-(2.3-4.3)Al (wt.%) are able to form alumina-rich protective scale during exposure to oxygen-containing molten Pb at 550-600 °C for 1000 h and to preserve the austenitic matrix [9][10]. The passive and continuous oxide scales, grown on alloy surfaces, are based on two corundum-type crystalline structures, Cr2O3 and Al2O3-Cr2O3 solid solutions.…”

“…small amounts of other elements can also be added to optimize the properties (e.g. mechanical, corrosion resistance, structure stability) for applications, for instance, stabilize the austenite structure (C, Cu, Mn), precipitate the minor secondary phases (Nb, Ti), increase scale adherence (Y), strengthen the austenite (W, Mo) and its grain boundaries (B) [17][18][19][20][21][22][23][24][25][26][27][28][29].…”