[Kovove materialy - Metallic materials]
    Fri - March 29, 2024 - 07:30 No. of hits : 1736636 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 47 (2009), Issue 3

Fatigue behaviour of M2 and M42 high speed steel up to the gigacycle regime
SOHAR, CH., R., BETZWAR-KOTAS, A., GIERL, CH., WEISS, B., DANNINGER, H.
vol. 47 (2009), no. 3, pp. 147 - 158

Abstract
The fatigue behaviour of two ingot metallurgy high speed steels – M2 and M42 / Bõhler S600 and S500, respectively – was investigated up to Nmax = 1010 loading cycles employing an ultrasonic frequency resonance testing system in fully reversed tension-compression mode. Testing was done parallel to the rolling direction. Fatigue failure in the tested cycle number range of 105 to 1010 cycles occurred at stress amplitudes between 900 and 500 MPa, respectively. Failure was initiated at internal carbide clusters, internal and subsurface non-metallic inclusions, and at primary carbides/carbide clusters located at/near the specimen surface, the latter of which represented the dominant failure mode. The obtained S-N curves revealed a continuous downward slope without any indication for a plateau region, and hardly any difference was observed between the two steels. In case of internal and subsurface failures the fracture surfaces revealed so-called fish-eye patterns formed around the crack origins. For at/near surface failures, half of fish-eye could be observed. In the vicinity of the crack nucleation site a granular area was detected followed by a fracture surface zone showing rather low surface roughness, thus appearing dark in the scanning electron micrographs.

Key words
tool steels, gigacycle fatigue, ultrasonic frequency fatigue testing, non-metallic inclusions, primary carbides clusters, fish-eye patterns

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.


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