Radiation Embrittlement of Ferritic Steels Global Objective

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Radiation Embrittlement of Ferritic Steels Global
Objective
RVSP - Reactor Vessel Surveillance Programs
Cv or J1c
Temperature

• Recent advances
• Effect of DSA on Fracture Toughness
• Effect of Cyclic-Loading on Fracture Toughness

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Some of the Ferritic Steels Ironstudied at NCSU
awires - irradiated in HIFAR Australia
bgrain sizes - 50 - 300 mm
Cd-Wrapped vs No Cd-Wrapping
Irradiated in Pulstar at NCSU
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K. Linga (KL) Murtylt Research Achievements
defect interactions gt
Dislocation Interstitial Impurity Point
Defect Interactions Pure Fe / Mild Steel New
Finding Radiation is not always detrimental
Is Neutron Radiation Always Detrimental to Metals
(Steels) ?
Nature 1984
Nov. 00
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Editorials on our research finding(two examples)
Science News
New Scientist
Discussion broadcast on BBC (Dr. E. Little)
Lead to technological application
Nov. 00
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DSA Radiation Effects
A533B RPV steel
Effects of Temperature and Radiation on J1c

• Recent advances
• Effect of DSA on Fracture Toughness
• Effect of Cyclic-Loading on Fracture Toughness
• (again significance and influence of defects)

Nov. 00