Improvement of high temperature oxidation resistance of rare earth metal-added Fe–20%Cr–5%Al alloys by pre-annealing treatment

2003 ◽  
Vol 20 (3) ◽  
pp. 319-326 ◽  
Author(s):  
K. Fukuda ◽  
K. Takao ◽  
T. Hoshi ◽  
Y. Usui ◽  
O. Furukimi
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
Oxidation Resistance ◽  
Rare Earth Metal ◽  
High Temperature Oxidation ◽  
Earth Metal ◽  
Annealing Treatment ◽  
Al Alloys ◽  
Temperature Oxidation

Studying on Rare Earth Aluminizing Process of GH4169 Superalloy

2011 ◽  
Vol 314-316 ◽  
pp. 267-272 ◽  
Author(s):  
Jun Ming Luo ◽  
Ji Lin Xu ◽  
Li Ping Deng
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
Oxidation Resistance ◽  
Crystalline Phase ◽  
High Temperature Oxidation ◽  
Micro Hardness ◽  
Aluminium Atom ◽  
Layer Transition ◽  
Temperature Oxidation ◽  
Gh4169 Superalloy

The aluminizing process by solid powder on the surface of GH4169 superalloy with different Y2O3content and different aluminizing temperature was investigated in this paper. The results show that the crystalline phase of aluminized coating is composed of AlNi, FeNi and AlNi3, and the phase of AlNi reaches 78.1%, which indicates that aluminium atom has infiltrated into the alloy surface. Y2O3can greatly improve compactness of the aluminized coating, increase thickness, surface micro-hardness and high temperature oxidation resistance of the aluminized coating. The thickness of the coating increases with the increase of temperature, but the microstructure of the aluminized samples cannot obviously divided into aluminized layer, transition layer and matrix when the aluminizing temperature is too high (980°C) or too low (920°C), and even the aluminized coating is porous and coarse at 980°C. The high temperature oxidation resistance of all the aluminized samples is improved compared to without aluminized samples. According to the microstructure, thickness, surface micro-hardness and high temperature oxidation resistance of aluminized coating, the optimal aluminizing process is 950°C×7h with 4%Y2O3.

The high-temperature oxidation resistance of Co-Al alloys

1975 ◽  
Vol 9 (5) ◽  
pp. 427-440 ◽  
Author(s):  
G. N. Irving ◽  
J. Stringer ◽  
D. P. Whittle
Keyword(s):  
High Temperature ◽  
Oxidation Resistance ◽  
High Temperature Oxidation ◽  
Al Alloys ◽  
Temperature Oxidation
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