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Materials Algorithms Project
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Function MAP_STEEL_DAFEG

Provenance of code.
Purpose of code.
Specification.
Description of subroutine's operation.
References.
Parameter descriptions.
Error indicators.
Accuracy estimate.
Any additional information.
Example of code
Auxiliary subroutines required.
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Provenance of Source Code

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

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Purpose

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

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Specification

Language:	FORTRAN
Product form:	Source code

DOUBLE PRECISION FUNCTION MAP_STEEL_DAFEG(XEQ, AJ)

DOUBLE PRECISION XEQ, AJ

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Description

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

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References

None provided.

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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.

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Error Indicators

None.

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Accuracy

No information supplied.

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Further Comments

None.

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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