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@PHDTHESIS{Schneider:841613,
author = {Schneider, Andre},
othercontributors = {Zander, Brita Daniela and Somers, Marcel A. J. and Seifert,
Hans Jürgen},
title = {{M}etal dusting},
school = {Rheinisch-Westfälische Technische Hochschule Aachen},
type = {Habilitationsschrift},
address = {Aachen},
publisher = {RWTH Aachen University},
reportid = {RWTH-2022-01862},
pages = {1 Online-Ressource : Diagramme},
year = {2020},
note = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
University 2022; Habilitationsschrift,
Rheinisch-Westfälische Technische Hochschule Aachen, 2020},
abstract = {Metal dusting is a high-temperature corrosion process which
attacks iron, low- and high-alloyed steels, and Co- or
Ni-based alloys in strongly carburising gas atmospheres with
carbon activities aC>> 1in the temperature range 400 to 1000
°C. It occurs in various processes in petrochemical plants,
e.g. for catalytic reforming, ammonia, and methanol
production, indirect reduction plants and further more. Some
examples of failure cases are given in the chapter on
industrial relevance. Although numerous studies have been
performed during the past decades to better understand this
high-temperature corrosion process and although various
approaches to make components in the above mentioned
environments resistant against metal dusting, the according
failures still occur. Thus, metal dusting is still an
important technical challenge requiring further scientific
studies and improved protection concepts. This work gives an
overview on the present understanding of the metal dusting
mechanisms. It discusses the proposed explanations and shows
examples of the variety of corrosion products observed by
the numerous researchers in the field. In addition, special
investigations on diffusion in iron carbides and also on the
constitution of the Fe-C system are discussed. The first
part of this work comprises the literature data on metal
dusting from the various research groups and also in a few
cases from industry. The results of the author of this work
and his co-authors are also reviewed and cited. It starts
with a general description of carburisation, coking, and
metal dusting. Then case studies are discussed to
demonstrate the industrial relevance of this
high-temperature corrosion process. The following chapters
focus on the metal dusting of iron and various Fe-based
alloys which are divided into ferritic and austenitic
steels. Various results on the effect of sulphur on metal
dusting retardation are based on respective studies with
iron, but the findings are also relevant for alloyed steels
and thus of high importance for the operation of
petrochemical units. Metal dusting of Ni-based alloys and
also coating developments for the protection against metal
dusting are then described. Metallurgical investigations
under metal dusting conditions are summarised in the last
chapter of the literature review. The second part describes
the various studies of the author of this work in detail.
The main results of these studies are partly cited in the
first part overviewing the according literature. The various
co-authors of these studies are mentioned in the preface of
this thesis and also in the citations of the literature
overview. The first two chapters focus on phase formation
and decomposition process during metal dusting. The third
chapter is on metal dusting of Fe-X (X = Si, Mo, V) alloys,
and the last chapter deals with metal dusting of Fe-Al-based
alloys. The most significant contributions to metal dusting
and also to the fundamentals of the Fe-C system are achieved
by the author of this thesis concerning the following
scientific topics:- the initiation of metal dusting of Fe,-
the propagation of metal dusting of Fe and the various
observed decomposition processes: - formation and
decomposition of metastable carbides into iron and carbide
particles, - formation of a cementite layer and
transformation into an iron layer which subsequently
decomposes itself,- the effect of sulphur on the retardation
of metal dusting of Fe,- the effect of alloying elements on
the metal dusting of Fe-based alloys: - Fe-Al alloys, - and
Fe-X (X = Si, Mo, V) alloys, - the constitution of Fe3C,-
the thermodynamics of Fe5C2 formation,- the carbon diffusion
in Fe3C and Fe5C2,- and the effect of alloying elements on
cementite growth in Fe-X (X = Si, Mo, V) alloys.},
cin = {522710 / 520000},
ddc = {620},
cid = {$I:(DE-82)522710_20140620$ / $I:(DE-82)520000_20140620$},
typ = {PUB:(DE-HGF)13},
doi = {10.18154/RWTH-2022-01862},
url = {https://publications.rwth-aachen.de/record/841613},
}
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