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The role of edge surface quality on cyclic deformation behaviour of non-oriented electrical steel sheets

Cyclic deformation behaviour of thin 3 % Si polycrystalline ferritic steel sheet is investigated in dependence on edge surface quality. Therefore, two different edge conditions are compared, whereas the edge is either polished or wire cut by Electrical Discharge Machining (EDM). The corresponding specimens are investigated by 3D optical microscopy and scanning electron microscopy. Strain- and stress-controlled fatigue tests are performed to determine S-N curves as well as cyclic hardening/softening curves. Differences in surface roughness are measured before, during and after the fatigue tests by non-contacting (optical) profilometer. SEM observations of fractured surfaces show the crack propagation mechanism and EBSD investigation indicate a correlation between grain orientation and…

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Cyclic deformation behaviour of thin 3 % Si polycrystalline ferritic steel sheet is investigated in dependence on edge surface quality. Therefore, two different edge conditions are compared, whereas the edge is either polished or wire cut by Electrical Discharge Machining (EDM). The corresponding specimens are investigated by 3D optical microscopy and scanning electron microscopy. Strain- and stress-controlled fatigue tests are performed to determine S-N curves as well as cyclic hardening/softening curves. Differences in surface roughness are measured before, during and after the fatigue tests by non-contacting (optical) profilometer. SEM observations of fractured surfaces show the crack propagation mechanism and EBSD investigation indicate a correlation between grain orientation and fatigue crack characteristic. The results are used as a reference for upcoming studies regarding punched electrical steel sheets.

Artikelnummer
LCF9-2022-058

Titel
The role of edge surface quality on cyclic deformation behaviour of non-oriented electrical steel sheets
Autor(en)
A. Gottwalt, U. Tetzlaff
DOI
10.48447/LCF9-2022-058
Veranstaltung
LCF9 - Ninth International Conference on Low Cycle Fatigue
Jahr der Veröffentlichung
2022
Publikationsart
Tagungsmanuskript (PDF)
Sprache
Englisch
Stichwörter
Non-oriented electrical steel,Crack initiation,Thin sheet,fatigue