Constitutive law of metallurgical phase transformations in solids without mechanical interaction (law called directly by PL8TM in Lagamine).

Prediction of metallurgical phase transformations for a given evolution of the temperature field.

Prepro: LMETA.F

These parameters are to be given at the initial temperature and for the initial metallurgical composition of the solid.

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File number = 35 ; Generally called *IN.MET
This *.met file is read in the Prepro by METLAW.F

This file contains all the data necessary to use effectively the laws META and THMET. It must always exist to perform a metallurgical thermal analysis. Sections 1. Title to 5. Description of TTT diagram are repeated with increasing ILAWN if more than one steel is described.

Remark: Some values are already defined in Integer parameters, pay attention to give the same value. Values as NTPCA, NPA, NVM, NTEMP are defined a first time automatically in LAWPRE. If you want to change these values, change also in the FORTRAN source file called LMETA.F.

All the characteristic temperatures are defined on the figure below:

If IPOLY =1

The conductivity $\lambda$, the mass density $\rho$, the heat capacity C and the hardness$ H_v$ have to be defined for each phase. The latent heat L is defined for each transformation. You can choose the order in which you want to define these parameters:

1. Firstly you give five letters (A5): 'A1^A2' where:
   
   1. A1 defines the thermal parameter
      
      • $\lambda \rightarrow$ LA
      • C$\rightarrow$ CA
      • $\rho \rightarrow$ RO
      • $H_v \rightarrow$ HV
      • L $\rightarrow$ TR
        
   2. $A_2$ defines the phase; For $\lambda, \rho, C, H_v$:
      • Austenite $\rightarrow$ AU
      • Bainite$\rightarrow$ BA
      • Proeutectoïd $\rightarrow$ PR
      • Martensite$\rightarrow$MA
      • Pearlite$\rightarrow$PE
        For L (latent heat) A2 = PR, PE, BA or MA to define in which phase the austenite is transformed.
2. Secondly you give the polynomial coefficient (A(I), I=1,NDPO+1) which defines the following polynomial: $$A(1)+A(2)T+A(3)T^{2}+ … +A(NDPO+1)T^{NDPO}$$
3. Finally the non-defined parameters will be initialized to zero. So if you know that only certain phases will be present you do not need to define the other phase parameters.

If IPOLY = 0
One must write FI followed by a blank card.
If input parameters (temperature dependent) are given as a table, all the tables must have the same length. Otherwise, it does not work properly.

The three phases : Proeutectoïd (PROEU). Pearlite (PERLI) and bainite (BAINI) have to be described successively by the sections detailed hereafter. The order PROEU, then PERLI, then BAINI must be respected.

N.B.These data are used to complete n and b coefficients of the Johnson-Mehl-Avrami law
Remark : The NTR number must be limited by the data NT1, NT2 or NT3 given in section General data for each phase (PROEU, PEARLI or BAINI)

Remark2 : Do not leave an empty card at the end of the *.met. Otherwise the Prepro will expect for another material.