[MAP Logo]

Materials Algorithms Project
Program Library



Function MAP_STEEL_DAFEG

  1. Provenance of code.
  2. Purpose of code.
  3. Specification.
  4. Description of subroutine's operation.
  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

H.K.D.H. Bhadeshia,
Phase Transformations Group,
Department of Materials Science and Metallurgy,
University of Cambridge,
Cambridge, U.K.

Top | Next

Purpose

To calculate the differential (with respect to the carbon concentration) of the natural logarithm of the activity of iron in austenite.

Top | Next | Prev

Specification

Language:FORTRAN
Product form:Source code

DOUBLE PRECISION FUNCTION MAP_STEEL_DAFEG(XEQ, AJ)

DOUBLE PRECISION XEQ, AJ

Top | Next | Prev

Description

MAP_STEEL_DAFEG gives the differential (with respect to the carbon concentration) of the natural logarithm of the activity of iron in austenite.

Top | Next | Prev

References

None provided.

Top | Next | Prev

Parameters

Input parameters

XEQ - real
XEQ is the paraequilibrium carbon concentration of austenite.

AJ - real
AJ = 1 - e[-W/(RT)], where W is the carbon-carbon interaction energy in austenite, R is the universal gas constant, and T is the absolute temperature.

Output parameters

MAP_STEEL_DAFEG - real
The differential with respect to carbon of the natural logarithm of the activity of iron in austenite.

Top | Next | Prev

Error Indicators

None.

Top | Next | Prev

Accuracy

No information supplied.

Top | Next | Prev

Further Comments

None.

Top | Next | Prev

Example

1. Program text

       DOUBLE PRECISION XEQ,AJ,MAP_STEEL_DAFEG,XDAF
       READ (5,*) XEQ,AJ
       XDAF = MAP_STEEL_DAFEG(XEQ,AJ)
       WRITE (6,*) XDAF
       STOP
       END

2. Program data

0.1   0.1

3. Program results

-31.5585

Top | Next | Prev

Auxiliary Routines

None.

Top | Next | Prev

Keywords

carbon, activity of iron, austenite

Top | Next | Prev

Download

Download source code

Top | Prev


MAP originated from a joint project of the National Physical Laboratory and the University of Cambridge.

MAP Website administration / map@msm.cam.ac.uk

Top | Index | MAP Homepage Valid HTML 3.2!