Fusion Reactor Steel

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Fusion Reactor Steel

• Sonny Martin Tevis Jacobs
• Yucheng Zhang Jiawen Chen

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• Fusion
• Neural networks
• Models
• Predictions and conclusions

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Fusion
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Design parameters

• Neutron damage 100-150 dpa
• Transmutation helium
• Up to 700ºC

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Irradiation Effects

• Irradiation hardening
• Irradiation creep
• Activation
• Swelling

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Irradiation Hardening

• Dislocation loops
• Condensation of defects
• Helium bubbles

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Why model?

• Suitable reactor does not exist
• Experiment would be costly
• Help design ITER

• Because were doing a modelling course!

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It cost an estimated 8 million to produce the
current data (116 million, 14 million,11
million)from FISSION reactor.
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• Fusion
• Neural networks
• Models
• Predictions and conclusions

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Neuron
Activation Function (tanh)
input
output
input
output
Biological Neuron
Digital Neuron
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Input Layer
Hidden Layer
Output Layer
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fi tanh ( Swij(1)xj ?i(1) )
y Swi(2)fi ?(2)
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OR logic
Value Input Input Output
Value X1 X2 Y
Value 0 0 0
Value 0 1 1
Value 1 0 1
Value 1 1 1
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Train by adjusting weights
Y X1? W1 X2 ? W2W3
W11, W21, W30
b
a
d
c
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y
x
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• Fusion
• Neural networks
• Models
• Predictions and conclusions

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Total Elongation
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Adding known science

• He/dpa
• exp-1/(Irradiation T)
• exp-1/(Test T)
• 1/L

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1/L
??y 2 ??y2, dislocations ??y2, bubbles
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Yield Strength
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• Fusion
• Neural networks
• Models
• Predictions and conclusions

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Yield Strength Predictions
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Uniform Elongation
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Uniform Elongation Predictions
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Measured Uniform Elongation Data
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We were not able to create a reasonable model for
uniform elongation
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• For the first time, predictions have been made of
  suitability of austenitic steel for fusion

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Total Elongation Predictions
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Measured Total Elongation Data
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• For austenitic stainless steels irradiated to
  doses consistent with fusion, ductility is likely
  to be unacceptably small

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Yield Strength Predictions
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• Irradiation hardening makes the steel brittle

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• BCC steel might be better

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Future work

• Verify experimentally (in 15 years)
• Investigate discrepancy in uniform ductility
• Record comprehensive data when doing experiment

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Acknowledgements

• Professor Harry Bhadeshia
• Richard Kemp

• The noodle lady in Market Square