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Titel
Influence of inclusion type on the very high cycle fatigue properties of 18Ni maraging steel
VerfasserKarr, Ulrike ; Schuller, Reinhard ; Fitzka, Michael ; Schönbauer, Bernd ; Tran, Duc ; Pennings, Bert ; Mayer, Herwig
Erschienen in
Journal of Materials Science, Berlin, 2017, Jg. 52, H. 10, S. 5954-5967
ErschienenSpringer, 2017
SpracheDeutsch
DokumenttypAufsatz in einer Zeitschrift
Schlagwörter (DE)Nicht verfügbar
ISSN1573-4803
URNurn:nbn:at:at-ubbw:3-2135 Persistent Identifier (URN)
DOI10.1007/s10853-017-0831-1 
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 Das Werk ist frei verfügbar
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Influence of inclusion type on the very high cycle fatigue properties of 18Ni maraging steel [1.86 mb]
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Zusammenfassung (Englisch)

The very high cycle fatigue (VHCF) properties of four 18Ni maraging steels were investigated. Ultrasonic fatigue tests were performed on thin sheets with nitrided surfaces at load ratio R = 0.1. Traditional maraging steel containing Ti (material A) showed crack initiation at TiN-inclusions. The elimination of Ti and the increase in Co content (material B) lead to preferential crack initiation at aluminate-inclusions. Aluminate-inclusions are less damaging than TiN-inclusions, and material B shows higher VHCF strength than material A. A further developed maraging steel (material C) with reduced Co content that is compensated for by alloying with Al showed crack initiation at aluminate- as well as at Zr(N,C)-inclusions. Zr(N,C)-inclusions are more damaging than aluminate-inclusions and less damaging than TiN-inclusions. The highest VHCF strength was found for a recently developed alloy with further increased Al content (material D). In addition to inclusion-initiated fracture, this material showed shear mode crack initiation in the nitrided zone at the surface.

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