Gigacycle Fatigue Response of PM versus Ingot Metallurgy Tool Steels

Autor(en)

Herbert Danninger, Christian Sohar, Christian Gierl, Agnieszka Betzwar-Kotas, Brigitte Weiss

Abstrakt

In this work, the gigacycle fatigue response of several tool steel grades has been studied using an ultrasonic resonance testing device. It showed that both with ingot metallurgy (IM) and powder metallurgy (PM) tool steels, a true fatigue limit does not exist up to 10E10 cycles. PM steels resulted in significantly higher endurance strength levels than IM grades. However, there was virtually no effect of the composition and hardness of the materials, both for PM and IM grades cold work tool steels and high speed steels exhibiting virtually the same S-N curves. In the IM tool steel grades, crack initiation started at large primary carbides or carbide clusters, while in the PM grades, nonmetallic inclusions were the critical sites. In any case it is very important to avoid introducing residual stresses into the specimen surfaces during preparation, which would markedly shift the endurance strength levels.

Organisation(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

Technische Universität Wien

Journal

Materials Science Forum

Band

672

Seiten

23-30

Anzahl der Seiten

8

ISSN

0255-5476

DOI

https://doi.org/10.4028/www.scientific.net/MSF.672.23

Publikationsdatum

2011

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/96d0ae76-d4f6-4118-9492-0b01e1ea0ffd