Prediction of Martensite Start Temperature for Lightweight Fe-Mn-Al-C Steels

• A tailor-made thermodynamic database of the Fe-Mn-Al-C system was developed using the CALPHAD approach. The database enables predicting phase equilibria and thereby assessing the resulting microstructures of Fe-Mn-Al-C alloys. Available information on the martensite start (M-s ) temperature was reviewed. By employing the M-s property model in the Thermo-Calc software together with the new thermodynamic database and experimental M-s temperatures, a set of model parameters for the Fe-Mn-Al-C system in the M-s model was optimised. Employing the newly evaluated parameters, the calculated M-s temperatures of the alloys in the Fe-Mn-Al-C system were compared with the available measured M-s temperatures. Predictions of M-s temperatures were performed for the alloys, Fe-10, 15 and 20 wt.% Mn-xAl-yC. The predictability of the M-s model can be further validated when new experimental M-s temperatures of the Fe-Mn-Al-C system are available.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)

Nyckelord

CALPHAD

Fe-Mn-Al-C

lightweight steels

martensite start temperature

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