Investigation on Manganese Sulfide Inclusion Sizes in 50CrMo4 Steels by means of Fractography, Micrograph Analysis and Immersion Ultrasound
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Cornelius Temmel
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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© 2009, Carl Hanser Verlag, München
Articles in the same Issue
- Contents/Inhalt
- Inhalt / Contents
- Technical Contributions/Fachbeiträge
- Investigation on Manganese Sulfide Inclusion Sizes in 50CrMo4 Steels by means of Fractography, Micrograph Analysis and Immersion Ultrasound
- Quantification of the Impact of Strontium on the Solidification Path of the Aluminum-Silicon-Copper Alloys Using Thermal Analysis Technique
- Focused Ion Beam: A Versatile Technique for the Fabrication of Nano-Devices
- Materialographic Report/Bericht aus der Materialographie
- Arbeitskreis “Präparation” im Fachausschuss Materialografie der Deutschen Gesellschaft für Materialkunde
Articles in the same Issue
- Contents/Inhalt
- Inhalt / Contents
- Technical Contributions/Fachbeiträge
- Investigation on Manganese Sulfide Inclusion Sizes in 50CrMo4 Steels by means of Fractography, Micrograph Analysis and Immersion Ultrasound
- Quantification of the Impact of Strontium on the Solidification Path of the Aluminum-Silicon-Copper Alloys Using Thermal Analysis Technique
- Focused Ion Beam: A Versatile Technique for the Fabrication of Nano-Devices
- Materialographic Report/Bericht aus der Materialographie
- Arbeitskreis “Präparation” im Fachausschuss Materialografie der Deutschen Gesellschaft für Materialkunde
