Determination of diffusion coefficient of oxygen in ?-iron from internal oxidation measurements in Fe-Si alloys

1986 ◽  
Vol 21 (6) ◽  
pp. 2133-2137 ◽  
Author(s):  
Jun Takada ◽  
Masao Adachi
Keyword(s):  
Diffusion Coefficient ◽  
Internal Oxidation ◽  
Diffusion Coefficient Of Oxygen

scholarly journals Determination of the Diffusion Coefficient of Oxygen for a Cover System Including a Pulp and Paper By-Product

2004 ◽  
Vol 27 (2) ◽  
pp. 11233 ◽  
Author(s):  
L David Suits ◽  
TC Sheahan ◽  
AR Cabral ◽  
P Tremblay ◽  
G Lefebvre
Keyword(s):  
Diffusion Coefficient ◽  
Pulp And Paper ◽  
Cover System ◽  
Diffusion Coefficient Of Oxygen

Calculation of Boundary Conditions between Internal and External Oxidation of Silicon or Chromium Containing Steels

2011 ◽  
Vol 696 ◽  
pp. 88-93 ◽  
Author(s):  
Shohei Nakakubo ◽  
Mikako Takeda ◽  
Takashi Onishi
Keyword(s):  
Boundary Condition ◽  
Diffusion Coefficient ◽  
Boundary Conditions ◽  
Oxygen Concentration ◽  
Internal Oxidation ◽  
Rate Equation ◽  
Oxidation Rate ◽  
Oxidation Rate Constant ◽  
External Oxidation ◽  
Diffusion Coefficient Of Oxygen

The boundary constants between internal and external oxidation of Si or Cr containing steels (Fe-Si alloys or Fe-Cr alloys) at 850°C were calculated in order to clarify the formation mechanism of fayalite scale (Fe2SiO4) or chromite scale (FeCr2O4), which can form as a “sub-scale” in Si or Cr containing steels. The diffusion coefficient of oxygen in the alloy, Do, and the oxygen concentration at the specimen surface, NO(s), which are constituents of the internal oxidation rate constant, (2DONO(s)/NB(O)n), were calculated for various oxidation conditions, and the rate equation for internal oxidation was derived. By comparing the calculated and measured values of (2DONO(s)/NB(O)n), we confirmed that the rate equation determined for internal oxidation was reasonable. The boundary condition between internal and external oxidation of Si or Cr containing steels (Fe-Si alloys or Fe-Cr alloys) at 850°C were also calculated by substituting the calculated values of DO and NO(s) into the rate equation.

Sign in / Sign up

Export Citation Format

Share Document