TEM Study of Bainitic Low-Carbon HSLA Steel: The Orientation Relationships of Cementite
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Silvia Illescas
Silvia Illescas is a PhD Student in the Department of Materials Science and Metallurgical Engineering in the University of Barcelona. Her subject research is the characterization of structure and mechanical properties of HSLA steels with bainitic structure. To improve her knowledge about TEM she stayed in the University of Leeds (UK). She collaborates with the CPT.Prof. Dr. Javier Fernández is professor in the Department of Materials Science and Metallurgical Engineering in the University of Barcelona. He is also the head of Dept. Engineering and Development of Materials (EDM) and he collaborates with the Centre of Thermal Spray (CPT). His speciality is related with physical metallurgy and phase transformations.
Abstract
Two different bainitic structures can be present in steel depending on the heat treatment to which the samples are subjected. The two different types of bainitic structures exhibit a different orientation relationship between the cementite and the ferrite matrix. The Pitsch orientation relationship is observed in upper bainite while the Bagaryatski orientation relationship is observed in lower bainite [1]. Different heat treatment samples of low-carbon High Strength Low Alloy (HSLA) steel were studied using TEM observations in order to ascertain the orientation relationship between ferrite and carbide in the different bainitic structures and to determine whether this relationship may indicate the type of bainitic structure.
Kurzfassung
Abhängig von der bei den Proben durchgeführten Wärmebehandlung können in Stahl zwei unterschiedliche bainitische Strukturen auftreten. Diese beiden unterschiedlichen bainitischen Strukturen zeigen verschiedene Orientierungsbeziehungen zwischen Zementit und Ferritmatrix. Die Pitsch-Orientierungsbeziehung ist im oberen Bainit, die Bagaryatski-Orientierungsbeziehung im unteren Bainit zu beobachten [1]. Proben des kohlenstoffarmen, hochfesten niedriglegierten Stahls (HSLA) mit unterschiedlicher Wärmebehandlung wurden im TEM untersucht zur Feststellung der Orientierungsbeziehung zwischen Ferrit und Karbid in den verschiedenen bainitischen Strukturen und zur Feststellung ob diese Beziehung den Typ der bainitischen Struktur anzeigen könnte.
About the authors
Silvia Illescas is a PhD Student in the Department of Materials Science and Metallurgical Engineering in the University of Barcelona. Her subject research is the characterization of structure and mechanical properties of HSLA steels with bainitic structure. To improve her knowledge about TEM she stayed in the University of Leeds (UK). She collaborates with the CPT.
Prof. Dr. Javier Fernández is professor in the Department of Materials Science and Metallurgical Engineering in the University of Barcelona. He is also the head of Dept. Engineering and Development of Materials (EDM) and he collaborates with the Centre of Thermal Spray (CPT). His speciality is related with physical metallurgy and phase transformations.
Acknowledgments
S. Illescas gratefully acknowledges the help in TEM and the indexation of bainitic diffraction patterns provided by the Institute of Materials Research (IMR), University of Leeds (UK), especially on the part of Dr. A.P. Brown, Dr. K. He, Dr. C. Hammond and Dr. R. Brydson. She also wishes to thank the Generalitat de Catalunya for the grant to Silvia Illescas (2003F100470) and the project 2005 SGR 00310.
Danksagungen
S. Illescas bedankt sich für die Unterstützung bei den TEM-Untersuchungen und der Indexierung der bainitischen Beugungsbilder durch das Institute of Materials Research (IMR), University of Leeds (UK), im Besonderen bei Dr. A.P. Brown, Dr. K. He, Dr. C. Hammond und Dr. R. Brydson. Sie bedankt sich ebenfalls bei der Generalitat de Catalunya für die finanzielle Unterstützung (2003F100470) und das Projekt 2005 SGR 00310.
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Übersetzung: G. Poech
Literatur/References
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© 2007 Carl Hanser Verlag, München
Articles in the same Issue
- Contents
- Gefügeentwicklung durch Wärmebehandlung an Magnesiumlötverbindungen
- Einfluss von thermomechanischer Behandlung auf die Mikrostruktur von pseudoelastischem NiTi am Beispiel von Komponenten für Brillengestelle
- TEM Study of Bainitic Low-Carbon HSLA Steel: The Orientation Relationships of Cementite
Articles in the same Issue
- Contents
- Gefügeentwicklung durch Wärmebehandlung an Magnesiumlötverbindungen
- Einfluss von thermomechanischer Behandlung auf die Mikrostruktur von pseudoelastischem NiTi am Beispiel von Komponenten für Brillengestelle
- TEM Study of Bainitic Low-Carbon HSLA Steel: The Orientation Relationships of Cementite
