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Program MAP_STEEL_MS_EMPIRICAL

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

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Purpose

Simple program in C which implements empirical equations for martensite start temperature.

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Specification

Language: ANSI C
Product form: Source code.

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Description of Program

Implementation of empirical equations.

  1. Ms(oF) = 930 - 570C - 60Mn - 50Cr - 30Ni - 20Si - 20Mo - 20W [Ref 1]
  2. Ms(oF) = 925 x (1-0.620C)(1-0.092Mn)(1-0.033Si)(1-0.045Ni)(1-0.070Cr)(1-0.029Mo)(1-0.018W)(1+0.120Co) [Ref 2]
  3. Ms(oF) = 930 - 600C - 60Mn - 50Cr - 30Ni - 20Si - 20Mo - 20W [Ref 3]
  4. Ms(oF) = 1000 - 650C - 70Mn - 70Cr - 35Ni - 50Mo [Ref 4]
  5. Ms(oF) = 930 - 540C - 60Mn - 40Cr - 30Ni - 20Si - 20Mo [Ref 5]
  6. Ms(oC) = 561 - 474C - 33Mn - 17Cr - 17Ni - 21Mo [Ref 6]
  7. Ms(oC) = 539 - 423C - 30.4Mn - 12.1Cr - 17.7Ni - 7.5Mo [Ref 7]
  8. Ms(oC) = 512 - 453C - 16.9Ni + 15Cr - 9.5Mo 217(C)2 - 71.5(C)(Mn)-67.6(C)(Cr) [Ref 7]

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

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References

  1. Payson P. and Savage C. H., Martensite Reactions in Alloy Steels, Trans ASM, 33 (1944) 261-275.
  2. Carapella L. A., ,"Computing A" or MS (Transformation temperature on quenching) from Analysis, Metal Progress 46 (1944) 108.
  3. Rowland E. S. and Lyle S. R., The Application of MS Points to Case Depth Measurement, Trans ASM, 37 (1946) 27-47.
  4. Grange R. A. and Stewart H. M., The Temperature Range of Martensite Formation, Trans AIME, (1946) 467-490.
  5. Nehrenberg A. E., Discussion of ref. 18., Trans AIME, 167 (1956) 494-498.
  6. Steven W. and Haynes A. G., The Temperature of Formation of Martensite and Bainite in Low-alloy Steel, J.I.S.I., 1983 (1965) 349-359.
  7. Andrews K. W., Empirical formulae for the calculation of some transformation temperatures, J.I.S.I., 203 (1965) 721-727.

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Parameters

Input parameters

Composition in weight percent of carbon, manganese, chromium, nickel, silicon, molybdenum, tungsten and cobalt.

Output parameters

Martensite start temperatures for each of the equations in Fahrenheit and Celcius.

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Error Indicators

No assessment of errors is made.

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Accuracy

No information supplied.

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Further Comments

None.

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Example

1. Program text

       N/A - complete program

2. Program data

3. Program Results


    
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Auxiliary Routines

    
None

    
    
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Keywords

    
Martensite, start temperature, Ms

    
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Download

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

        
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