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Improvement of inclusion cleanness in bearing steel and Catreatedsteel

Published online by Cambridge University Press:  17 January 2008

F. Ruby-Meyer ,
E. Hénault ,
M. Rocher-Bakour  and
F. Merchi
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Abstract

Two complementary techniques are mainly used for the detectionand characterisation of the inclusions populations present in thesteel bars in a large range of sizes: from 1 μm to 1 mm: the automaticscanning electron microscope associated with image analysisand the 80 MHz ultrasonic inspection. The emphasis has been puton the composition of the inclusions whose size is above the criticalsize (10 - 20 μm) for long life fatigue. The mechanism of formation ofthese harmful inclusions is determined through the process with thehelp of thermodynamics models. This approach makes it possible toimprove the process: avoiding slag entrapment upon casting of bearingsteels, adjusting closely the Ca addition to calcium treatedsteels.


Type
Research Article
Information
Metallurgical Research & Technology , Volume 104 , Issue 12: SteelmakingCold rollingUse of steel , December 2007 , pp. 585 - 590
Copyright
© La Revue de Métallurgie, 2007

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