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J. Phys. IV France
Volume 07, Numéro C5, November 1997
IVth European Symposium on Martensitic Transformations
Page(s) C5-417 - C5-422
IVth European Symposium on Martensitic Transformations

J. Phys. IV France 07 (1997) C5-417-C5-422

DOI: 10.1051/jp4:1997566

Martensitic Transformations of Austenite below 273 K. Dilatometric and Magnetic Studies

I.A. Wierszyllowski

Institute of Materials Science, Poznan University of Technology, Pl. Sklodowskiej-Curie 5, 60-965 Poznan, Poland

The transformation of austenite (Fe-C, Fe-1.5Cr-1C, Fe-N, Fe-Mn-N) to martensite during quenching to the ambient temperature followed by cooling to 77 K was studied with a use of dilatometry and magnetic force measurements. We can see three transformations of austenite. The first during quenching, the second during cooling to 77 K, and the third during an increase of temperature from 77 K to the ambient one. The first 40 minutes of holding at ambient temperature influences most significantly the temperature of the second transformation of austenite. Temperatures of austenite transformation indicated as the increase of magnetic force during the third transformation are lower than that determined by increase of volume (dilatometry). Amounts of autenite transformed during the third transformation determined by magnetic force measurements are somewhat higher than those determined by dilatometry. The reasons of these differences are discussed on the basis of recent publications.

© EDP Sciences 1997