Analysis of R. P. Smith's and D. C. Parris-R. B. Mclellan's carbon diffusivity data

1980 ◽  
Vol 30 (12) ◽  
pp. 1315-1321 ◽  
Author(s):  
Jar Kučera ◽  
K. Stránský
Keyword(s):  
Carbon Diffusivity

Self-Interstitial Injection Effects on Carbon Diffusion in Silicon At High Temperatures

1985 ◽  
Vol 59 ◽  
Author(s):  
L. A. Ladd ◽  
J. P. Kalejs
Keyword(s):  
High Temperatures ◽  
Carbon Diffusion ◽  
Time Dependent ◽  
Ambient Conditions ◽  
Significant Time ◽  
Temperature Range ◽  
Carbon Diffusivity ◽  
Sims Analysis ◽  
Diffusion Profiles

ABSTRACTCarbon diffusivity is reported for different ambient conditions imposed during annealing of silicon in the temperature range from 800 to 100°C, which produce varying levels of silicon self-interstitial supersaturation. The diffusivities are deduced from SIMS analysis of carbon out-diffusion profiles. Carbon diffusivity is increased by up to a factor of 70 in annealing with phosphorus in-diffusion, and by a factor of as much as seven in an oxidizing ambient, when compared to anneals in a nitrogen ambient. The enhancements tend to decrease above 11000C. This behavior can be explained by attributing the increase in carbon diffusivity to self-interstitial supersaturation which increases the concentration of highly mobile carbon selfinterstitial pairs. Significant time dependent effects were also observed for 800 and 9000C phosphorus in-diffusion conditions.

Integral Approach and Numerical Improvement to Calculate Carbon Concentration Profiles in Carburising

2011 ◽  
Vol 264-265 ◽  
pp. 1494-1499 ◽  
Author(s):  
Wei Min Gao ◽  
Ling Xue Kong ◽  
Peter D. Hodgson
Keyword(s):  
Carbon Content ◽  
Carbon Diffusion ◽  
Integral Approach ◽  
Exponential Dependence ◽  
The Third ◽  
Integral Methods ◽  
Carbon Diffusivity ◽  
Part Surface ◽  
Constant Diffusivity ◽  
Treated Layer

The carbon diffusion in steel, where the carbon diffusivity varies with the carbon content, was solved with the integral methods under the third boundary condition. The variation of carbon diffusivity in steel with the carbon content was described with two different functions, linear dependence and exponential dependence. The integral approximation for both cases was improved with the numerical computation to more accurately predict the carbon profiles. The integral solution is more accurate than the formulation based on the assumption of a constant diffusivity or those based on the assumption of a constant diffusivity and/or constant carbon content at part surface. It is also more easily used in practice than the numerical method to describe the carburising process and predict the carbon content at steel surface and carbon profiles in treated layer.

Concentration-Dependent Carbon Diffusivity in Austenite

2014 ◽  
Vol 45 (9) ◽  
pp. 3790-3799 ◽  
Author(s):  
Xiaoting Gu ◽  
Gary M. Michal ◽  
Frank Ernst ◽  
Harold Kahn ◽  
Arthur H. Heuer
Keyword(s):  
Carbon Diffusivity

Carbon diffusivity in multi-component austenite

2011 ◽  
Vol 64 (9) ◽  
pp. 805-808 ◽  
Author(s):  
Seok-Jae Lee ◽  
David K. Matlock ◽  
Chester J. Van Tyne
Keyword(s):  
Carbon Diffusivity

Carbon diffusivity in Mo2C from 800 to 1000 °C

1985 ◽  
Vol 106 (2) ◽  
pp. 241-249 ◽  
Author(s):  
Bruce M. Warnes ◽  
G. Simkovich
Keyword(s):  
Carbon Diffusivity
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