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HomeMaterials Science ForumMaterials Science Forum Vols. 825-826Gigacycle Fatigue Behaviour of Sintered WC-Co...

Gigacycle Fatigue Behaviour of Sintered WC-Co Hardmetals Investigated by Ultrasonic Resonance Testing

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Abstract:

Hardmetals, manufactured from powders by pressing and sintering, are the most important tool materials in service today. In many applications, such as milling or percussion drilling, they are subjected to fatigue with considerable loading cycle numbers. In the present study, the fatigue behaviour of hardmetals in push-pull loading was investigated up to N_max = 10¹⁰ using ultrasonic resonance fatigue testing. It showed that with all hardmetal grades investigated there is no fatigue “limit”, i.e. a horizontal branch of the S-N curve, but a consistent drop of the curve up to maximum N. Crack initiation was found to occur predominantly microstructure-controlled, as compared to defect controlled as typical for powder metallurgy tool steels.Keywords: gigacycle fatigue, WC-Co hardmetals, ultrasonic fatigue testing, fatigue limit

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20th Symposium on Composites

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Periodical:

Materials Science Forum (Volumes 825-826)

Pages:

1016-1023

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.825-826.1016

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Online since:

July 2015

Authors:

Agnieszka Betzwar Kotas*, Brigitte Weiss, Herbert Danninger

Keywords:

Fatigue Limit, Gigacycle Fatigue, Ultrasonic Fatigue Testing, WC-Co Hardmetals

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