Materials Algorithms Project
Program Library

Program MAP_TTTtoCCTlinear

1. Provenance of code.
2. Purpose of code.
3. Specification.
4. Description of program.
5. References.
6. Parameter descriptions.
7. Error indicators.
8. Accuracy estimate.
9. Any additional information.
10. Example of code
11. Auxiliary subroutines required.
12. Keywords.
13. Download source code.
14. Links.

Provenance of Source Code

Mathew Peet and Teruhisa Okumara
Phase Transformations and Complex Properties Group,
Department of Materials Science and Metallurgy,
University of Cambridge,
Cambridge, U.K.

Top | Next

Purpose

Simple program in FORTRAN to calculate CCT diagram.

Top | Next | Prev

Specification

Top | Next | Prev

Description of Program

An input TTT curve is converted into a CCT curve using Scheil's additive reaction rule, for linear cooling. The calculated natural cooling curve is divided into a series of small isothermal steps.

Based on MAP_STEEL_TTT_TO_CCT

No error checking exists, no account of the range of applicability of the formulae is made.

Top | Next | Prev

References

Top | Next | Prev

Parameters

Input parameters

IINFORM - integer

IINFORM specifies the format of the input TTT curve.

IPAIRS - integer

IPAIRS specifies the number of points in the input TTT curve.

THEQU - real

THEQU is the temperature above which the product phase cannot form (°C).

PAE3 - real

PAE3 is the Ae3' temperature above which the ferrite cannot form under paraequilibrium conditions. At this temperature the time is set to zero (°C).

MS - real

MS is the martensite start temperature (°C).

ISWITCH - integer

ISWITCH is a flag which if set to unity causes all the arrays in the subroutine to be initialised. This is needed if the subroutine is called more than once.

TITTT - real

TITTT is an array used to store the transformation start times for the input TTT curve (s).

TMTTT - real

TMTTT is an array used to store the temperature for the input TTT curve (°C).

Output parameters

Cooling rate in K/s, Temperature at which transformation starts in Celcius and corresponding time for start of transformation in seconds.

2. Program data

	1 29 0.8139E3 0.8139E3 0.4746E3 0
	0.7600E+03 0.1675E+12
	0.7400E+03 0.2112E+06
	0.7200E+03 0.7462E+03
	0.7000E+03 0.6394E+02
	0.6800E+03 0.2026E+02
	0.6600E+03 0.9643E+01
	0.6400E+03 0.6796E+01
	0.6200E+03 0.8430E+01
	0.6000E+03 0.3299E+02
	0.5800E+03 0.4692E+02
	0.5600E+03 0.9134E+02
	0.5400E+03 0.2300E+03
	0.5200E+03 0.7192E+03
	0.5000E+03 0.2730E+04
	0.4800E+03 0.1234E+05
	0.4600E+03 0.6583E+05
	0.4400E+03 0.4225E+06
	0.4200E+03 0.3220E+07
	0.4000E+03 0.2945E+08
	0.3800E+03 0.3262E+09
	0.3600E+03 0.4437E+10
	0.3400E+03 0.7165E+11
	0.3200E+03 0.1487E+13
	0.3000E+03 0.4106E+14
	0.2800E+03 0.1507E+16
	0.2600E+03 0.7929E+17
	0.2400E+03 0.5942E+19
	0.2200E+03 0.6672E+21
	0.2000E+03 0.1192E+24

3. Program Results

 RATE  |  TMCCT  |    TICCT    |
0.178E-04     756.2    0.3242E+07
0.316E-04     753.3    0.1916E+07
0.562E-04     748.1    0.1170E+07
0.100E-03     740.0    0.7390E+06
0.178E-03     739.9    0.4159E+06
0.316E-03     739.8    0.2342E+06
0.562E-03     739.7    0.1320E+06
0.100E-02     739.3    0.7458E+05
0.178E-02     738.7    0.4226E+05
0.316E-02     737.7    0.2409E+05
0.562E-02     735.9    0.1388E+05
0.100E-01     732.6    0.8129E+04
0.178E-01     726.8    0.4898E+04
0.316E-01     719.7    0.2979E+04
0.562E-01     718.1    0.1703E+04
0.100E+00     715.3    0.9857E+03
0.178E+00     710.3    0.5823E+03
0.316E+00     701.5    0.3554E+03
0.562E+00     695.5    0.2106E+03
0.100E+01     686.6    0.1273E+03
0.178E+01     675.6    0.7775E+02
0.316E+01     662.3    0.4794E+02
0.562E+01     644.9    0.3005E+02
0.100E+02     552.6    0.2613E+02
0.178E+02     200.0    0.3452E+02
0.000E+00       0.0    0.0000E+00
0.000E+00       0.0    0.0000E+00
0.000E+00       0.0    0.0000E+00
0.000E+00       0.0    0.0000E+00
0.000E+00       0.0    0.0000E+00

Top | Next | Prev

Auxiliary Routines

None

Top | Next | Prev

Keywords

Scheil additivity, Cooling, CCT, TTT

Top | Next | Prev

Download

Download source code.

Top | Prev