53001
2021
eng
109618
190
article
Elsevier Ltd.
1
--
--
--
The impact of the microstructure of Fe-16Cr-0.2C on high-temperature oxidation – sulphidation in SO2
This study elucidates the impact of the microstructure of Fe-16Cr-0.2C on oxide layer formation at 650 ◦C in Ar-0.5 % SO2. A cold-rolled and two heat-treated states of the alloy were exposed for up to 1000 h. The samples were characterised in detail from microstructural and chemical perspectives using scanning electron microscopy (SEM), X-ray diffraction (XRD) and time-of-flight secondary ion mass spectrometry (ToF-SIMS). The microstructural modification of the alloy by heat-treatment was advantageous. It was found that Cr-carbides support chromia formation and reduce sulphidation when their area fraction is low and diameter is small.
Corrosion Science
10.1016/j.corsci.2021.109618
publish
21.09.2021
Florian Falk
Oded Sobol
Christiane Stephan-Scherb
eng
uncontrolled
Steel
eng
uncontrolled
Iron
eng
uncontrolled
SIMS
eng
uncontrolled
SEM
eng
uncontrolled
High temperature corrosion
eng
uncontrolled
Oxidation
eng
uncontrolled
Sulphidation
Ingenieurwissenschaften und zugeordnete Tätigkeiten
5 Werkstofftechnik
5.1 Materialographie, Fraktographie und Alterung technischer Werkstoffe
6 Materialchemie
6.1 Oberflächen- und Dünnschichtanalyse
9 Komponentensicherheit
Material
Degradation von Werkstoffen
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
5.0 Abteilungsleitung und andere
9.0 Abteilungsleitung und andere
45368
2017
eng
poster
0
--
--
--
Early oxidation and sulfidation of high temprature alloys: An EDXRD in-situ study
P92 is one of the important steels for super heater tubes used in combustion plants. However, in fossil fuel fired environments the formation of oxides and sulfides are challenging the material. To understand early corrosion mechanisms, which are important for process prediction, high temperature in-situ ageing experiments of Fe-Cr-Mn alloys in SO2 and SO2+H2O atmosphere were performed, applying energy dispersive X-ray diffraction (EDXRD) analysis.
Bessy usermeeting
Berlin, Germany
05.12.2017
07.12.2017
Florian Falk
Martina Menneken
eng
uncontrolled
Corrosion
eng
uncontrolled
In-situ
eng
uncontrolled
EDXRD
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Präsentation
49212
2019
eng
poster
0
--
--
--
Microstructural impact on high temperature oxidation behavior of Fe-Cr-C model alloys
Chromia forming high alloyed ferritic-austenitic steels are being used as boiler tube materials in biomass and coal-biomass co-fired power plants. Despite thermodynamic and kinetic boundary conditions, microstructural features such as grain orientation, grain sizes or surface deformation contribute to the oxidation resistance and formation of protective chromium-rich oxide layers. This study elucidates the impact of microstructure such as the grain size and number of carbide precipitates on high temperature oxidation at 650°C in 0.5% SO2 atmosphere. Cold-rolled Fe-16Cr-0.2C material was heat-treated to obtain two additional microstructures. After exposure to hot and reactive gases for 10 h < t < 1000 h layer thicknesses and microstructure of oxide scales are observed by scanning electron microscopy and Energy-dispersive X-ray spectroscopy. The two heat treated alloys showed reasonable oxidation resistance after 1000 h of exposure. The oxidation rate was substantially higher for the alloy with a duplex matrix after heat treatment compared to the fine-grained material.
Gordon Research Conference
New London, New Hampshire, USA
21.07.2019
26.07.2019
false
true
Florian Falk
eng
uncontrolled
Corrosion
eng
uncontrolled
Microstructure
eng
uncontrolled
Oxidation
eng
uncontrolled
Sulfidation
Ingenieurwissenschaften und zugeordnete Tätigkeiten
5 Werkstofftechnik
5.1 Materialographie, Fraktographie und Alterung technischer Werkstoffe
Material
Degradation von Werkstoffen
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Präsentation
49213
2019
eng
lecture
0
--
--
--
The impact of water vapour on high-temperature surface degradation by sulfurous gases of ferritic alloys
Sulfur and water have a fundamental impact on the corrosion rate and potential failure of materials. It is therefore necessary to understand the mechanisms, rates, and potential means of transport, as well as the reactions of these elements with an alloy. This work investigates the effect of water vapor in the initial stages of SO2 corrosion of an ferritic model alloy containing 9 wt% Cr and 0.5 wt% Mn.
The exposure experiments were studied at 650°C in situ under laboratory conditions using energy-dispersive x-ray diffraction analysis. Two separate experiments were run, one with a 99.5% Ar + 0.5% SO2 atmosphere and one with a 69.5% Ar + 0.5% SO2 + 30% H2O atmosphere. With a wet atmosphere, the alloy formed a scale with decreasing oxygen content towards the scale–alloy interface. Sulfides were identified above and below a (Fe, Cr)3O4 layer in the inner corrosion zone. In contrast to this, the overall scale growth was slower in a dry SO2 atmosphere.
EUROCORR
Barceló Sevilla Renacimiento, Seville, Spain
09.09.2019
13.09.2019
false
true
0
Florian Falk
eng
uncontrolled
Diffraction
eng
uncontrolled
Sulfidation
eng
uncontrolled
Early oxidation
eng
uncontrolled
Corrosion
eng
uncontrolled
In situ
Ingenieurwissenschaften und zugeordnete Tätigkeiten
5 Werkstofftechnik
5.1 Materialographie, Fraktographie und Alterung technischer Werkstoffe
Material
Degradation von Werkstoffen
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Präsentation
47284
2019
eng
1
6
71
article
Springer
New York
1
--
--
--
Real-time observation of high- temperature gas corrosion in dry and wet SO2-containing atmosphere
Sulfur and water have a fundamental impact on the corrosion rate and potential failure of materials. It is therefore necessary to understand the mechanisms, rates, and potential means of transport, as well as the reactions of these elements with an alloy. This paper investigates the effect of water vapor in the initial stages of SO2 corrosion of an Fe-9Cr-0.5Mn model alloy at 650°C in situ under laboratory conditions using energy-dispersive x-ray diffraction analysis. Two separate experiments were run, one with a 99.5% Ar + 0.5% SO2 atmosphere and one with a 69.5% Ar + 0.5% SO2 + 30% H2O atmosphere. With a wet atmosphere, the alloy formed a scale with decreasing oxygen content towards the scale–alloy interface. Sulfides were identified above and below a (Fe, Cr)3O4 layer in the inner corrosion zone. In contrast to this, the overall scale growth was slower in a dry SO2 atmosphere.
JOM The Journal of The Minerals, Metals & Materials Society (TMS)
10.1007/s11837-019-03335-9
https://link.springer.com/article/10.1007/s11837-019-03335-9#enumeration
1047-4838
1543-1851
urn:nbn:de:kobv:b43-472844
11.04.2019
Creative Commons - CC BY - Namensnennung 4.0 International
Florian Falk
M. Menneken
Christiane Stephan-Scherb
eng
uncontrolled
Early oxidation
eng
uncontrolled
Early sulfidation
eng
uncontrolled
Ferritic steels
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Angewandte Physik
5 Werkstofftechnik
5.1 Materialographie, Fraktographie und Alterung technischer Werkstoffe
Energie
Material
Degradation von Werkstoffen
Verlagsliteratur
Datei für die Öffentlichkeit verfügbar ("Open Access")
Wissenschaftliche Artikel der BAM
Bundesanstalt für Materialforschung und -prüfung (BAM)
https://opus4.kobv.de/opus4-bam/files/47284/10.1007_s11837-019-03335-9.pdf
46134
2018
deu
poster
0
--
--
--
Early oxidation and sulfidation of high temperature model alloys: An EDXRD in situ study
The fundamental impact of sulfur and water on corrosion rates and potential failure of the exposed material is well known. However, the access to the related corrosion mechanism causing material degradation is often a problem to solve. This study investigates the effect of SO2 and water vapor in the initial stages of corrosion of an Fe9Cr0.5Mn model alloy at 650 °C in situ. The analysis was carried out under laboratory conditions using energy-dispersive X-ray diffraction (EDXRD).
Dechema EFC Workshop
Frankfurt am Main, Germany
26.09.2018
28.09.2018
Florian Falk
eng
uncontrolled
Sulfidation
eng
uncontrolled
Model alloy
eng
uncontrolled
Oxidation
Ingenieurwissenschaften und zugeordnete Tätigkeiten
5 Werkstofftechnik
5.1 Materialographie, Fraktographie und Alterung technischer Werkstoffe
Material
Degradation von Werkstoffen
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Präsentation
58992
2022
eng
1
13
203
article
Elsevier Ltd.
1
--
--
--
Comprehensive insights into competitive oxidation/sulfidation reactions on binary ferritic alloys at high temperatures
Interpreting high-temperature corrosion induced by mixed-gas atmospheres is challenging due to the different contributions of oxidizing gases. Here, a comprehensive study on the combined oxidation/sulfidation using label molecules is presented. Fe-Cr model alloys with 2 wt% and 9 wt% Cr were isothermally exposed using a volumetric mixture of 0.5%S16O2/27%H218O and 0.5%S16O2/7%H218O at 650 ◦C for 5 h and then characterized by secondary ion mass spectroscopy (SIMS). Additionally, the reactions were followed in-situ utilizing energy dispersive X-ray diffraction. The study showed that both S16O2 and H218O contribute to the oxidation of the alloys but to different extents depending on the Cr-content.
Corrosion Science
10.1016/j.corsci.2022.110236
0010-938X
publish
04.12.2023
false
true
Christiane Stephan-Scherb
Juho Lehmusto
Florian Falk
Oded Sobol
Bruce Pint
eng
uncontrolled
SEM
eng
uncontrolled
Steel
eng
uncontrolled
Iron
eng
uncontrolled
SIMS
Ingenieurwissenschaften und zugeordnete Tätigkeiten
5 Werkstofftechnik
5.1 Materialographie, Fraktographie und Alterung technischer Werkstoffe
Material
Degradation von Werkstoffen
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")