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In this second example, we increase the amount of carbon and calculate the amount of the different phases forming.

Let's consider a simplified type 347: Fe-18Cr-12Ni-0.2Nb-(0-0.4)C
0.4 wt%C is much larger than the content of a typical 347.

## Settings

• You have to define the system:

multiphase

define source sgte_sol sub_sgte plus !

define system 'Fe,Cr,Ni,Nb,C' !

class abs p(*) !

class no p(fcc_a1,CNb,M23C6,M7C3) !

set temperature 1373 !

• Setting the composition:

set w 100 !

set w(2) 18 w(3) 12 w(4) 0.2 !

Note: If you don't remember the number of the components:

list system components !

• Stepping carbon:

step w(5)0.0 0.4 0.01 !

The step is small and if many phases were present, it would be helpful to reduce it, unless you want to wait half an hour.

## Computing

• Starting:

compute print graphic !

• Setting the carbon content as abscissa and amount of phases as ordinate:

abscissa mass component(C) !

ordinate n phase !

plot go

• Set the y axis limits to area of interest and replot:

(a+return) ordinate limit 0 4 !

plot go

 PT-group 2003 Thomas Sourmail, Cambridge. Please email feedback !