I want to investigate the precipitation behavior in IF steel. I know that FCC_A1#2 and FCC_A1#3 represent the precipitates containing Ti, C and N (like TiN, TiC). But, how can I select TiS as one of the selected phase in the equilibrium calculation? I don't know the phase name of TiS in Thermo-Calc calculation.
Can you help me with this?
First, you can check which phase is expected to be the equilibrium Ti-S phase, defining the simple binary system, and evaluating for the composition x(Ti)=0.5. Thermocalc proposes Pyrrhotite, TiS, as equilibrium phase, which has different structure from MX-type (fcc). That´s why it does not show up as fcc-phase due to miscibility gap in the fcc-phase (like it is the case for TiN, e.g.). Removing this phase from the calculation, no other (metastable) phase with 50:50 Ti:S shows up. This means that whenever one observes a metastable precursor precipitate to this equilibrium phase, the Thermocalc database cannot deliver the correct results. Aside of the test of precipitation simulation using pyrrhotite phase, experimental structural analysis of observed TiS phase is recommended.
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