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dc.contributor.author
Ghidini, Andrea
dc.contributor.author
Diener, Markus
dc.contributor.author
Mazzù, Angelo
dc.contributor.author
Zani, Nicola
dc.contributor.author
Petrogalli, Candida
dc.contributor.author
Faccoli, Michela
dc.date.accessioned
2021-03-24T07:07:35Z
dc.date.available
2020-04-19T02:48:14Z
dc.date.available
2020-04-22T06:42:38Z
dc.date.available
2021-03-24T07:07:35Z
dc.date.issued
2020-03
dc.identifier.issn
0020-0956
dc.identifier.uri
http://hdl.handle.net/20.500.11850/410568
dc.description.abstract
The aim of this paper is to clarify the effects of bainitic spots in the homogeneous lamellar pearlite structure of wheels located near the tread. Bainite is an intermediate structure, always in overlapping with pearlite, which is formed during the heat treatment of quenched and tempered steels, even though its quantity can be controlled depending also on the chemical analysis and CCT diagrams of the steel. The process management guarantees a proper level of hardness and mechanical properties in the wheel. The formation of bainite is inevitable during the continuous cooling of hypo-eutectoid C steel grades (ER7, ER8, ER8S, ER9) where the Carbon Equivalent is exceeding 0.6%. In order to mitigate the presence of bainitic islands on the tread, Lucchini RS is working since a long period toward the calibration of a special aim analysis and an adapted design. According to the hardenability of the new aim analysis, the cooling rate of the devices for rim chilling was defined, with the objective to both reduce bainitic structures and obtain hardness and toughness properties in the rim. A method of bainite content measurement was proposed and used on ER7, ER8 and ER8S wheels after the activation of all the improvement actions. Furthermore, in order to qualitatively investigate the effect of the presence of bainite structures in the wheels, 2D plain strain finite element (FE) simulations were carried out. © 2020, CIFI Collegio Ingegneri Ferroviari Italiani.
en_US
dc.language.iso
it
en_US
dc.publisher
Collegio Ingegneri Ferroviari Italiani
en_US
dc.title
Considerazioni sulla microstruttura di ruote monoblocco con tracce di bainite
en_US
dc.title.alternative
Considerations about microstructure of solid wheels with traces of bainite
en_US
dc.type
Journal Article
ethz.journal.title
Ingegneria Ferroviaria
ethz.journal.volume
75
en_US
ethz.journal.issue
3
en_US
ethz.journal.abbreviated
Ing. Ferrov.
ethz.pages.start
165
en_US
ethz.pages.end
178
en_US
ethz.identifier.scopus
ethz.publication.place
Roma
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2020-04-19T02:48:25Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2021-03-24T07:07:46Z
ethz.rosetta.lastUpdated
2021-03-24T07:07:46Z
ethz.rosetta.versionExported
true
ethz.COinS
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