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CARACTERIZAÇÃO MAGNÉTICA DOS EFEITOS DE DEFORMAÇÃO EM AÇOS ESTRUTURAIS ATRAVÉS DA TÉCNICA BITTER MODIFICADA

  • 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. It was reported in literature the phenomenon of the spontaneous emergence of weak magnetic fields in structural steels and pipelines, which originates 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 the change of magnetic domains after undergoing plastic deformation were studied. For this purpose, a colloidal solution with paramagnetic particles in the nanometer scale (ferrofluid) wasThe 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. It was reported in literature the phenomenon of the spontaneous emergence of weak magnetic fields in structural steels and pipelines, which originates 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 the change of magnetic domains after undergoing plastic deformation were studied. For this purpose, a colloidal solution with paramagnetic particles in the nanometer scale (ferrofluid) was used, through the Bitter technique, in order to, not only observe a change in size of the magnetic domains of the material, but also changes in their morphology. Ferritic steels with different carbon contents (0.08%; 0.22% and 0.45%) were studied in this work.zeige mehrzeige weniger

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Metadaten
Autor*innen:Lucas Kling e Silva, Gabriela Ribeiro Pereira, Paula Mendes Jardim, Nadja Sonntag, Birgit SkrotzkiORCiD
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Graue Literatur
Sprache:Portugiesisch
Titel des übergeordneten Werkes (Portugiesisch):72nd ABM Annual Congress
Jahr der Erstveröffentlichung:2017
Verlag:Blucher Preceeding
Verlagsort:Brasilien
Jahrgang/Band:72
Ausgabe/Heft:1
Erste Seite:3003
Letzte Seite:3013
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
Freie Schlagwörter:Ferrofluid; Magnetic domains; Plastic deformation; Steels
Veranstaltung:ABM Week 2017
Veranstaltungsort:Sao Paulo, Brazil
Beginndatum der Veranstaltung:02.10.2017
DOI:10.5151/1516-392X-30810
ISSN:2594-5327
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:09.09.2019
Referierte Publikation:Nein
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