TY - JOUR A1 - Costa e Silva, A. A1 - Coelho, D. A1 - Kranzmann, Axel A1 - Rizzo, Fernando T1 - Simulation of Fe-Cr-X Alloy Exposed to an Oxyfuel Combustion Atmosphere at 600°C N2 - In coal-fired power plants using oxyfuel combustion process with carbon capture and sequestration, instead of air, a mixture of oxygen and recirculated flue gas is injected in the boiler. A series of steels were exposed to CO2-SO2-Ar-H2O gas mixtures at 600 °C for 1000 h to compare their high temperature corrosion behavior. During the corrosion process, carburization, decarburization and recrystallization were observed underneath the oxide scale depending on the gas mixture and alloy composition. The conditions that lead to carburization are not yet completely understood, but decarburization can be simulated using thermodynamic and kinetic models. In this work, the results of these simulations are compared with measured values for one of the alloys that displayed a decarburized region. Since the mobility of carbon in the scale is not known, two strategies were adopted: simulation of alloy-atmosphere contact; and estimation of the carbon flux to produce the observed decarburization. The second approach might give an insight on how permeable to carbon the scale is. KW - CALPHAD approach KW - Corrosion KW - Decarburization KW - DICTRA modeling KW - Experimental kinetics PY - 2016 U6 - https://doi.org/10.1007/s11669-015-0421-3 SN - 1547-7037 VL - 37 IS - 1 SP - 19 EP - 24 PB - ASTM International AN - OPUS4-50612 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Costa e Silva, A. A1 - Coelho, D. A1 - Rizzo, F. A1 - Kranzmann, Axel T1 - Simulation of Fe-Cr-X alloy exposed to an oxyfuel combustion atmosphere at 600 °C N2 - In coal-fired power plants using oxyfuel combustion process with carbon capture and sequestration, instead of air, a mixture of oxygen and recirculated flue gas is injected in the boiler. A series of steels were exposed to CO2-SO2-Ar-H2O gas mixtures at 600 °C for 1000 h to compare their high temperature corrosion behavior. During the corrosion process, carburization, decarburization and recrystallization were observed underneath the oxide scale depending on the gas mixture and alloy composition. The conditions that lead to carburization are not yet completely understood, but decarburization can be simulated using thermodynamic and kinetic models. In this work, the results of these simulations are compared with measured values for one of the alloys that displayed a decarburized region. Since the mobility of carbon in the scale is not known, two strategies were adopted: simulation of alloy-atmosphere contact; and estimation of the carbon flux to produce the observed decarburization. The second approach might give an insight on how permeable to carbon the scale is. KW - CALPHAD approach KW - Corrosion KW - Decarburization KW - DICTRA modeling KW - Experimental kinetics KW - Iron alloys KW - Kinetics KW - Multicomponent diffusion KW - Steel PY - 2016 U6 - https://doi.org/10.1007/s11669-015-0421-3 SN - 1547-7037 SN - 1863-7345 VL - 37 IS - 1 SP - SI, 19 EP - 24 PB - Springer US AN - OPUS4-40110 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Pfennig, Anja A1 - Kranzmann, Axel T1 - Borehole integrity of austenitized and annealed pipe steels suitable for carbon capture and storage (CCS) N2 - Properties of pipe steels for CCS (carbon capture and storage) technology require resistance against the corrosive environment of a potential CCS-site (heat, pressure, salinity of the aquifer, CO2-partial pressure). The influence of austenitzing in heat treatment routines of two different injection pipe Steels (1.4034, X46Cr13 and 1.4021, X20Cr13) was evaluated. Steel coupons were austenitized at different temperatures (900- 1050 °C) for different lengths of time (30-90 min) before quenching and annealing prior to long term corrosion experiments (60°C, 100 bar, artificial brine close to a CCS-site in the Northern German Basin, Germany). In general, fewer pits are found on X46Cr13. Comparing steels with 13% chromium each the higher carbon content of X46Cr13 (0.46% C) results in a lower number of pits compared to X20Cr13 (0.20% C). It is found that neither the carbon content of the steels nor austenitizing temperature has much influence, but local corrosion behaviour is most susceptible towards austenitzing time. T2 - 2016 APCBEES Pattaya Conference CY - Pattaya, Thailand DA - 23.01.2016 KW - Heat Treatment KW - CCS KW - CO2 KW - Corrosion KW - Steel PY - 2016 AN - OPUS4-38444 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Pfennig, Anja A1 - Kranzmann, Axel T1 - Borehole integrity of austenitized and annealed pipe steels suitable for carbon capture and storage (CCS) N2 - Properties of pipe steels for CCS (carbon capture and storage) technology require resistance against the corrosive environment of a potential CCS-site (heat, pressure, salinity of the aquifer, CO2-partial pressure). The influence of austenitzing in heat treatment routines of two different injection pipe steels (1.4034, X46Cr13 and 1.4021, X20Cr13) was evaluated. Steel coupons were austenitized at different temperatures (900-1050 °C) for different lengths of time (30-90 min) before quenching and annealing prior to long term corrosion experiments (60°C, 100 bar, artificial brine close to a CCS-site in the Northern German Basin, Germany). In general, fewer pits are found on X46Cr13. Comparing steels with 13% chromium each the higher carbon content of X46Cr13 (0.46% C) results in a lower number of pits compared to X20Cr13 (0.20% C). It is found that neither the carbon content of the steels nor austenitizing temperature has much influence, but local corrosion behaviour is most susceptible towards austenitzing time. T2 - 6th International Conference on Future Environment and Energy (ICFEE 2016) CY - Pattaya, Thailand DA - 23.01.2016 KW - CCS KW - CO2 KW - Corrosion KW - Steel KW - Heat treatment PY - 2016 SP - 9 EP - 14 AN - OPUS4-38980 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -