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Final report on Contract No 7210-PR/050.

The predictive capability of the thermodynamic database system Thermo-Calc has been evaluated for a wide range of stainless steels. Standard metallographical techniques and methods such as X-ray, TEM (transmission electron microscopy), SEM using backscattered electron detector, EPMA (electron probe micro analysis) and DTA (differential thermal analysis) have been applied. Specimens of the steels were subjected to equilibrium heat-treatments at temperatures ranging from 700 to 1200°C, with the analysis focusing on the phases and their compositions. The results from these analyses and equilibrium data from external references were summarised in a data file and compared with the predictions of Thermo-Calc. The overall agreement is good, but deviations were observed for the sigma phase and the liquid and solid phases of nitrogen alloyed steels. In addition, thermodynamic information is lacking or partially lacking for a number of phases such as eta, pi, Laves and hop-phases. Furthermore, some phases appear in the experiments in spite of being predicted metastable in the Thermo-Calc database. A new model has been introduced for the sigma phase with a revised description of binary and ternary parameters. The homogeneity range of the sigma phase in higher and lower systems has been adjusted in terms of temperature and alloy composition to account for new experimental data.

Additional information

Authors: WESSMANN S M, SIMR, Stockholm (SE);HERTZMANN S, SIMR, Stockholm (SE);FRISK K, SIMR, Stockholm (SE);JARGELIUS PETTERSON R F A, SIMR, Stockholm (SE);MECOZZI G, CSM, Rome (IT);SUNDMAN B, Royal Institute of Technology, Stockholm (SE);LILJAS M, AvestaPolarit, Avesta (SE);LUNDSTRÖM M, Sandvik Steel, Sandviken (SE);LUNDSTROM M, Sandvik Steel, Sandviken (SE)
Bibliographic Reference: EUR 20315 EN (2002), pp.182. Euro: 28.00
Availability: EUR-OP reference: KI-NA-20315-EN-S Available from EUR-OP sales agents. URL:
ISBN: ISBN: 92-894-3655-7
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