Low-temperature diffusion of carbon in iron measured by SIMS technique

0354400 - ÚFM 2011 RIV CZ eng C - Conference Paper (international conference)
Čermák, Jiří - Král, Lubomír
Low-temperature diffusion of carbon in iron measured by SIMS technique.
METAL 2010. Conference proceedings. Ostrava: Tanger, s.r.o, 2010, Č. PC2. ISBN 978-80-87294-15-4.
[Metal 2010. International Conference on Metallurgy and Materials /19./. Rožnov pod Radhoštěm (CZ), 18.05.2010-20.05.2010]
Institutional research plan: CEZ:AV0Z20410507
Keywords : SIMS * carbon diffusion * ferrite
Subject RIV: BJ - Thermodynamics

Depth profiling mode of MiniSIMS device was applied to diffusion measurement. As an example, carbon diffusion in BCC iron was studied. There are sparse experimental diffusion data at temperatures below the eutectic horizontal (996 K). This is caused by the fact that direct measurement of carbon diffusion coefficient in ferrite at low temperatures is complicated by very low solubility of carbon. For practical purposes, the extrapolation of high-temperature data to low temperature region is usually used for estimation of diffusioncontrolled kinetics in ferrite alloys. Present work has shown that the SIMS technique can be applied to the study of carbon diffusivity in iron. Special technique was developed, which avoids radio-tracer measurements with C-14. Obtained results are lower than the extrapolated values, which may be due to limited solubility of carbon in iron.
Permanent Link: http://hdl.handle.net/11104/0193409