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Damage tolerance of nuclear graphite at elevated temperatures.

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Area of Science:

  • Materials Science
  • Nuclear Engineering

Background:

  • Nuclear-grade graphite is vital for fission reactors.
  • Understanding its high-temperature behavior is crucial for safety and performance.

Purpose of the Study:

  • To investigate the mechanical properties and damage evolution of nuclear-grade graphite at elevated temperatures.
  • To identify the mechanisms behind strength and fracture toughness changes.

Main Methods:

  • In situ mechanical testing combined with synchrotron X-ray computed micro-tomography.
  • Testing conducted on Gilsocarbon graphite from ambient to 1,000°C.

Main Results:

  • Both strength and fracture toughness of nuclear-grade graphite increase with temperature.
  • Microcrack closure and reduced residual tensile stresses contribute to improved mechanical properties at 800-1,000°C.

Conclusions:

  • Nuclear-grade graphite exhibits enhanced mechanical performance at high temperatures.
  • Residual stress state significantly influences graphite's damage tolerance in reactor conditions.