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H.K.D.H. Bhadeshia,

Phase Transformations Group,

Department of Materials Science and Metallurgy,

University of Cambridge,

Cambridge, U.K.

This subroutine is for the calculation of the fraction and composition of gamma prime in nickel base superalloys, together with their mechanical properties.

Language: | FORTRAN |

Product form: | Source code |

SUBROUTINE MAP_NICKEL_SUPER4(S,SUMVAC,A,Y,V,F,B,C,M,UTS20,

& UTS650,UTS760,UTS871,UTS982)

DOUBLE PRECISION S(8),A(8),Y(8),V(8),P(8),VAC(8),AS(8),

& SUMVAC,UTS20,UTS650,UTS760,UTS871,UTS982,F,B,C,M

If SUMVAC, the electron-valency concentration, is less than 2.3, then the matrix is stable to the formation of topologically close-packed phases. It is unstable otherwise.

The arrays S,A,Y, and V contain concentrations of the following alloy elements (in order): nickel, chromium, molybdenum, aluminium, titanium, cobalt, tungsten, and tantalum.

- S. Atamert and H. K. D. H. Bhadeshia, Materials Science and Technology,
__5__(1989) 1220-1228.

**S**- real array of dimension 8- S contains the concentrations (in weight percent) of the elements in the alloy.

**SUMVAC**- real- SUMVAC is the electron-vacancy concentration.
**A**- real array of dimension 8- A is the concentrations (in atomic percent) of the elements in the alloy.
**Y**- real array of dimension 8- Y contains the atomic weights in gamma'.
**V**- real array of dimension 8- V contains the atomic weights in gamma.
**F**- real- F is the volume fraction of gamma'. If the calculated value of F is negative, then F is set to zero.
**B**- real- B is the gamma' lattice parameter (in nanometres).
**C**- real- C is the gamma lattice parameter (in nanometres).
**M**- real- M is the percentage lattice misfit.
**UTS20**- real- UTS20 is the tensile strength (in MPa) at a temperature of 20°C.
**UTS650**- real- UTS650 is the tensile strength (in MPa) at a temperature of 650°C.
**UTS760**- real- UTS760 is the tensile strength (in MPa) at a temperature of 760°C.
**UTS871**- real- UTS871 is the tensile strength (in MPa) at a temperature of 871°C.
**UTS982**- real- UTS982 is the tensile strength (in MPa) at a temperature of 982°C.

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electron-vacancy, tensile strength

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