Influence of inclusion type on the very high cycle fatigue properties of 18Ni maraging steel

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 eli...

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Bibliographic Details
Published in:Journal of materials science 2017-05, Vol.52 (10), p.5954-5967
Main Authors: Karr, Ulrike, Schuller, Reinhard, Fitzka, Michael, Schönbauer, Bernd, Tran, Duc, Pennings, Bert, Mayer, Herwig
Format: Article
Language:English
Subjects:
Analysis
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crack initiation
Crystallography and Scattering Methods
Fatigue (Materials)
Fatigue tests
Fracture mechanics
High cycle fatigue
Inclusions
Maraging steels
Materials Science
Metal fatigue
Original Paper
Polymer Sciences
Solid Mechanics
Steel
Zirconium
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Summary: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.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-017-0831-1