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CARACTERIZAÇÃO MAGNÉTICA PRÉ E PÓS DEFORMAÇÃO DE AÇOS DE CONSTRUÇÃO NÃO LIGADOS ATRAVÉS DA TÉCNICA BITTER (FERROFLUIDO)

Magnetic characterization before and after deformation of non-alloyed contruction steels using bitter technic

  • The plastic deformation results in irreversible microstructure changes in the steel, which can be considered as the initial stage of the fracture process. However, detecting, monitoring and evaluating, damage states and small defects non-destructively in advance still proves challenging. Dubov reported the phenomenon of the spontaneous emergence of weak magnetic fields in ferritic structural steel and pipelines, which originate due to heterogeneous mechanical and / or thermal stresses. This observation is not associated with induced phase transformations by deformation and appears to be a promising tool for the prior characterization of damage in ferromagnetic steels. To provide a better understanding of the physical bases of the process, the magnetic microstructure of such materials and a change of magnetic domains after undergoing plastic deformation were studied. A colloidal solution with paramagnetic particles in the nanometer range (ferrofluid), which allowed, through the BitterThe plastic deformation results in irreversible microstructure changes in the steel, which can be considered as the initial stage of the fracture process. However, detecting, monitoring and evaluating, damage states and small defects non-destructively in advance still proves challenging. Dubov reported the phenomenon of the spontaneous emergence of weak magnetic fields in ferritic structural steel and pipelines, which originate due to heterogeneous mechanical and / or thermal stresses. This observation is not associated with induced phase transformations by deformation and appears to be a promising tool for the prior characterization of damage in ferromagnetic steels. To provide a better understanding of the physical bases of the process, the magnetic microstructure of such materials and a change of magnetic domains after undergoing plastic deformation were studied. A colloidal solution with paramagnetic particles in the nanometer range (ferrofluid), which allowed, through the Bitter technique, not only to observe a change in size of the magnetic domains of the material, but also changes in their morphology. Ferritic steels with their concentrations of carbon in its composition (0.12%; 0.17% and 0.45%) were studied in this work.zeige mehrzeige weniger

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Metadaten
Autor*innen:Lucas Kling e Silva, Nadja Sonntag, Birgit SkrotzkiORCiD
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Graue Literatur
Sprache:Mehrsprachig
Titel des übergeordneten Werkes (Portugiesisch):15th Enemet
Jahr der Erstveröffentlichung:2015
Verlag:Blucher Preceedings
Verlagsort:Rio de Janeiro, Brazil
Jahrgang/Band:15
Ausgabe/Heft:15
Erste Seite:2942
Letzte Seite:2950
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
Freie Schlagwörter:Bitter Technique; Ferrofluid; Magnetic Domains; Steels
Veranstaltung:15° ENEMET - ABM Week 2015
Veranstaltungsort:Rio de Janeiro, Brazil
Beginndatum der Veranstaltung:17.08.2015
Enddatum der Veranstaltung:20.08.2015
DOI:10.5151/1516-392X-26931
ISSN:2594-4711
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:31.12.2015
Referierte Publikation:Nein
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