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H.K.D.H. Bhadeshia,
Phase Transformations Group,
Department of Materials Science and Metallurgy,
University of Cambridge,
Cambridge, U.K.
To estimate the Charpy toughness of steel welds (manual metal arc or submerged arc), as a function of strength, microstructure, chemical composition and temperature over a limited range of inputs as stated in [1].
| Language: | FORTRAN |
| Product form: | Source code |
DOUBLE PRECISION X(100), W1(10,100), W2(10),THETA1(100), H(10),
& AMIN(15),AMAX(15)
MAP_NEURAL_WELD_TOUGHNESS is an interactive program which uses the results of a neural network training process to permit the estimation of the Charpy impact toughness for manual metal arc and submerged arc weld metal samples. This is as a function of the following variables, within the stated ranges:-
Process, submerged arc (0.5) or manual metal arc (-0.5)
| Parameter | Minimum | Maximum |
|---|---|---|
| Yield strength /MPa | 0.3470D+03 | 0.6450D+03 |
| Carbon /wt% | 0.2900D-01 | 0.1300D+00 |
| Silicon/wt% | 0.2800D+00 | 0.1140D+01 |
| Manganese/wt% | 0.7700D+00 | 0.2250D+01 |
| Phosphorus/wt% | 0.8000D-02 | 0.2800D-01 |
| Sulphur/wt% | 0.2000D-02 | 0.1700D-01 |
| Aluminium/wt% | 0.1000D-02 | 0.4000D-01 |
| Nitrogen/ppmw | 0.2600D+02 | 0.1190D+03 |
| Oxygen/ppmw | 0.2340D+03 | 0.8210D+03 |
| Primary microstructure/% | 0.0000D+00 | 0.9100D+02 |
| Allotriomorphic ferrite/% | 0.1600D+02 | 0.6200D+02 |
| Acicular ferrite/% | 0.1100D+02 | 0.8100D+02 |
| Temperature / K | 0.2130D+03 | 0.2930D+03 |
| Charpy toughness / J | 4.00 | 215.0 |
The program uses the file "WEIGHTS" to obtain the neural network training information.
The data that were used originally to train the neural network are also available under the section entitled Materials Data (Weld Toughness Data).
None.
The full calculation of the error bars as presented in [1] is not reproduced in this program. An average error of ± 40 J may be assumed reasonable but will not be reliable in all cases.
None.
Complete program.
PROCESS (-0.5 for MMA, 0.5 for Submerged Arc)?
0.5
Yield Strength at 20 Centigrade, MPa (347-645)?
450
Carbon, wt.% (0.029-0.130)?
0.1
Silicon, wt.% (0.28-1.14)?
0.4
Manganese, wt.% (0.77-2.50) ?
0.9
Phosphorus, wt.% (0.008-0.028)?
0.008
Sulphur, wt.% (0.002-0.017)?
0.005
Aluminium, wt.% (0.001-0.040)?
0.01
Nitrogen, ppmw (26-119)?
50
Oxygen, ppmw (234-821)?
300
Primary Microstructure % (0-91)?
20
Allotriomorphic Ferrite % (16-62)?
54
Acicular Ferrite %(11-81)?
40
Temperature, Centigrade (-60 to 20) ?
20
** WELD CHARPY TOUGHNESS **
Darwin College, Cambridge & ESAB AB (Sweden)
Bhadeshia, Svensson & MacKay
Process 0.5 Yield Strength 450. MPa
Carbon 0.100 wt.% Silicon 0.400 wt.%
Manganese 0.900 wt.% Phosphorus 0.008 wt.%
Sulphur 0.005 wt.% Aluminium 0.010 wt.%
Nitrogen 50. ppmw Oxygen 300. ppmw
Primary 20. % Allotriomorphic 54. %
Acicular 40. % Temperature 20. C
Charpy Toughness, Joules = 121.
WRITT
neural network, weld toughness
MAP originated from a joint project of the National Physical Laboratory and the University of Cambridge.
MAP Website administration / map@msm.cam.ac.uk