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Function MAP_STEEL_GMART

Provenance of code.
Purpose of code.
Specification.
Description of subroutine's operation.
References.
Parameter descriptions.
Error indicators.
Accuracy estimate.
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Example of code
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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

Used by MAP_STEEL_MART in estimating the volume fraction of martensite.

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Specification

Language:	FORTRAN
Product form:	Source code

DOUBLE PRECISION FUNCTION MAP_STEEL_GMART(VMART,MS,TQ)

DOUBLE PRECISION VMART,MS,TQ

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Description

MAP_STEEL_GMART = - log(1 - VMART)/VMART - M(MS - TQ) - 1
where [1] gives a value of M of 0.0029.

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References

S.A. Khan and H.K.D.H. Bhadeshia, Materials Science and Engineering A, 129A, (1990), 257-272.

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Parameters

Input parameters

VMART - real: VMART is the current estimate of the volume fraction of martensite.
MS - real: MS is the martensite-start temperature of the alloy (in Kelvin).
TQ - real: TQ is the ambient temperature for the retained austenite calculation (in Kelvin).
M - real: M is a constant. See [1] for a value of M of 0.0029.

Output parameters

MAP_STEEL_GMART - real function: See description.

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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 VMART,MS,TQ,MAP_STEEL_GMART,XGM
      READ (*,*) VMART,MS,TQ
      XGM=MAP_STEEL_GMART(VMART,MS,TQ)
      WRITE (*,*) XGM
      STOP
      END