Temperature-Pressure Diagram

Purpose: Learn to calculate a Temperature-Pressure diagram. In this example, a Temperature-Pressure diagram is calculated for pure Fe component.

Module: PanPhaseDiagram

Thermodynamic Database: Fe_Pressure.tdb

Batch file: Example_#1.18.pbfx

Load Fe_Pressure.tdb following the procedure in Pandat User's Guide: Load Database ;
Perform a Section Calculation from PanPhaseDiagram, and set the calculation condition as shown in Figure 1;

Figure 1: Setup calculation of T-P diagram for pure Fe, x-axis is P and y-axis is T

Change graph appearance following the procedure in Pandat User's Guide: Property;
Label the graph following the procedure in Pandat User's Guide: Icons for Graph on Toolbar;

Figure 2 shows the default plot when calculation is finished, it is T-log10(P). It clearly demonstrates the stability of each phase at different temperature and pressure;
Detailed information on the three-phase reactions, i.e., the temperatures and pressures at triple points can be found in the “invariant” table;
From Default table, other plots, such as T-P diagram, can be plotted as shown in Figure 3;

Figure 2: Temperature-log (Pressure) diagram for pure Fe component

Figure 3: Temperature-Pressure diagram for pure Fe component