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

M. Harmelin; C. Dimitrov; M. Da Cunha Belo; O. Dimitrov

doi:doi:10.1051/jphyscol:1982472

Issue		J. Phys. Colloques Volume 43, Number 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 M_s 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 M_s 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 M_s to composition is applicable to the whole composition range studied.