Numéro
J. Phys. Colloques
Volume 43, Numéro C4, Décembre 1982
ICOMAT-82
International Conference on Martensitic Transformations
Page(s) C4-467 - C4-472
DOI https://doi.org/10.1051/jphyscol:1982472
ICOMAT-82
International Conference on Martensitic Transformations

J. Phys. Colloques 43 (1982) C4-467-C4-472

DOI: 10.1051/jphyscol:1982472

COMPOSITIONAL DEPENDENCE OF Ms TEMPERATURES IN HIGH-PURITY IRON-CHROMIUM-NICKEL AUSTENITIC ALLOYS

M. Harmelin, C. Dimitrov, M. Da Cunha Belo et O. Dimitrov

Centre d'Etudes de Chimie Métallurgique, CNRS, 15 Rue G. Urbain, 94400 Vitry, France


Abstract
The onset of martensitic transformation on cooling has been studied in high-purity Fe-14 to 20 wt % Cr -8 to 25 wt % Ni austenitic alloys. In samples with Fe < 72 %, extensive transformation takes place below Ms according to the sequence γ → ε → α'. In samples with Fe > 72 %, α'-formation occurs in two successive stages ; possible transformation models are considered. No unique formula relating Ms to composition is applicable to the whole composition range studied.