Professor George Smith, FRS
Department of Materials, University of Oxford, Oxford, UK
Where are the Carbon Atoms in Martensite?
Abstract: This presentation will provide an overview of work carried out at Oxford using atom probe microanalysis, to establish the distribution of carbon atoms in as-quenched and room-temperature aged martensitic steels, and in steels tempered at elevated temperatures. A wide range of phenomena have been observed, including segregation of carbon atoms to grain boundaries, twin boundaries, lath boundaries and thin films of retained austenite; formation of Cottrell atmospheres at dislocations; coherent clustering of carbon atoms in the martensite matrix, apparently by a spinodal process; and the formation of a succession of carbide phases of increasing stability. The inter-relationships between the atomic-scale processes occurring during the various stages of ageing and tempering will be explored. The role of alloying elements in the tempering process will also be discussed.
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The seminar takes place on Wednesday, November 16, 2:00 p.m. in the ICAMS seminar room UHW 11/1102, Stiepeler Straße 129, 44801 Bochum.
Department of Materials
University of Oxford.