Institute of Physics of Materials AS CR, v. v. i. > Projects > Carbon diffusion in carbon-supersaturated ferrite and austenite steels

Carbon diffusion in carbon-supersaturated ferrite and austenite steels

InvestigatorRNDr. Jiří Čermák, CSc., DSc.
Number of ProjectP108/11/0148
AgencyGrantová agentura České republiky
Duration2010-12-31 - 2013-12-30

Anotace
We propose to study the rate of carbon diffusion in carbon-supersaturated BCC and FCC phases of chosen Fe and Ni based alloys. The carbon supersaturation may be produced, e.g., as a result of a phase transformation of advanced materials or under a great concentration gradient in protective surface layer. Contrary to the fact that carbon diffusion coefficient is relatively high the mean diffusion path of carbon diffusion during the material production and/or during the projected service of the construction component may be very short due to low temperature. It means that carbon supersaturation is kept during the whole service time of the material. With respect to such conditions, it is desirable to know carbon diffusion coefficient in carbon-supersaturated matrices, which enables (i) to estimate the residual lifetime of the material and (ii) to design new types of material. The principal experimental method is very fine SIMS depth profiling. The results of the proposed study will elucidate kinetics of the process and/or sability of carbon-supersaturated materials.


2014

Čermák J., Král L.: Effect of carbon-supersaturation upon the carbon diffusion in 9Cr-1Mo ferrite steel. Mater. Lett. 116 (2014) 402-404

Čermák J., Král L.: Carbon diffusion in carbon-supersaturated ferrite and austenite. J. Alloys Comp. 586 (2014) 129-135

Čermák J., Král L.: Extremely slow carbon diffusion in carbon-supersaturated surface of ferrite. Kovové materiály 52 (2014) 125-133



2013

Čermák J., Král L.: Beneficial effect of carbon on hydrogen desorption kinetics from Mg-Ni-In alloy. J. Alloys Comp. 546 (2013) 129-137



2012

Čermák J., Král L.: Ageing of Mg-Ni-H hydrogen storage alloys. Int. J. Hydrogen Energy 37 (2012) 14257-14264

Čermák J., Král L.: Alloying of Mg/Mg2Ni eutectic by chosen non-hydride forming elements: Relation between segregation of the third element and hydride storage capacity. J. Power Sources 197 (2012) 116-120

Čermák J., Král L.: Improvement of hydrogen storage characteristics of Mg/Mg2Ni by alloying: Beneficial effect of In. J. Power Sources 214 (2012) 208-215



2011

Čermák J., David B.: Catalytic effect of Ni, Mg2Ni and Mg2NiH4 upon hydrogen desorption from MgH2. Int. J. Hydrogen Energy 36 (2011) 13614-13620