Startseite Investigation on Manganese Sulfide Inclusion Sizes in 50CrMo4 Steels by means of Fractography, Micrograph Analysis and Immersion Ultrasound
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Investigation on Manganese Sulfide Inclusion Sizes in 50CrMo4 Steels by means of Fractography, Micrograph Analysis and Immersion Ultrasound

  • Cornelius Temmel , Birger Karlsson , Ketil Torresvoll und Christopher Fallqvist
Veröffentlicht/Copyright: 5. Mai 2013
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Abstract

Increasing loads in powertrain components have put manganese sulfide inclusions in the spotlight of engineers. The indigenous sulfides are accounted responsible for the poor fatigue performance of highly loaded steel parts. In order to relate fatigue performance to manganese sulfide inclusion size, an accurate geometrical description of the sulfides is necessary. Fatigue testing generally reveals maximum inclusion sizes, since the largest inclusions will initiate fatigue failure. Micrograph analysis and immersion ultrasonic testing have been carried out in order to compare those methods with the referenced values of fatigue testing. It showed that immersion ultrasound is not capable of detecting manganese sulfide inclusions of the present sizes. Micrograph analysis, however, is applicable, if analysis data is modified subjectively.

Kurzfassung

Zunehmende Lasten bei Antriebskomponenten brachten Mangansulfid-Einschlüsse in den Fokus der Ingenieure. Die sich bildenden Sulfide werden für das schlechte Ermüdungsverhalten von hochbelasteten Stahlkomponenten verantwortlich gemacht. Um das Ermüdungsverhalten zur Größe der Mangansulfideinschlüsse in Verbindung zu bringen, ist eine genaue geometrische Beschreibung der Sulfide notwendig. Mit Hilfe von Ermüdungsversuchen werden die größten Einschlussgrößen im Testvolumen entdeckt, da üblicherweise die größten Einschlüsse Ermüdungsbrüche auslösen. Gefügeanalyse und Immersionsultraschallversuche erfolgten zum Vergleich dieser Methoden mit den Referenzwerten der Ermüdungsversuche. Es konnte gezeigt werden, dass Immersionsultraschall Mangansulfideinschlüsse der vorhandenen Größe nicht detektieren kann. Anwendbar ist jedoch die Gefügeanalyse, wenn die Analysedaten subjektiv modifiziert werden.


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Dr. Cornelius Temmel born 1973, studied Industrial Engineering and Materials Science at the Technical University Graz, Austria, at NTNU Trondheim, Norway, and at Chalmers UT, Sweden. Since 2001 he works as a research engineer at the Materials Laboratory of the Volvo Corporation.

Prof. Dr. Birger Karlsson born in 1941, studied Engineering Physics at Chalmers UT, Sweden. Received his present Professor's chair in Materials Engineering at Chalmers UT in 1992. Served as expert in various scientific boards. Secretary General of The Royal Academy of Arts and Sciences in Gothenburg since 1997.


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Received: 2008-7-3
Accepted: 2008-8-22
Published Online: 2013-05-05
Published in Print: 2009-03-01

© 2009, Carl Hanser Verlag, München

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