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Using local GND density to study SCC initiation.

Naganand Saravanan1, Phani S Karamched1, Junliang Liu1

  • 1Department of Materials, University of Oxford, Parks Road, OX1 3PH Oxford, UK.

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|July 15, 2020
PubMed
Summary
This summary is machine-generated.

High local densities of geometric necessary dislocations (GNDs) are critical for triggering stress corrosion cracking (SCC) in Alloy 600. This study mapped GNDs around grain boundaries in primary water reactor environments to identify SCC initiation conditions.

Keywords:
Alloy 600Geometric necessary dislocationsStress corrosion crackingTransmission Kikuchi diffraction

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Area of Science:

  • Materials Science
  • Corrosion Science
  • Nuclear Engineering

Background:

  • Stress corrosion cracking (SCC) is a significant degradation mechanism for Alloy 600 in primary water reactor (PWR) environments.
  • Understanding the local conditions that initiate SCC is crucial for ensuring the integrity of nuclear reactor components.
  • Geometric Necessary Dislocations (GNDs) are known to influence material behavior under stress.

Purpose of the Study:

  • To clarify the local conditions that trigger SCC initiation of Alloy 600 in PWR water.
  • To correlate strain and GND densities with SCC and intergranular oxidation at grain boundaries.
  • To investigate the role of GNDs in SCC initiation by comparing cracked and uncracked grain boundaries.

Main Methods:

  • High-resolution "on-axis" Transmission Kikuchi Diffraction (TKD) was employed for nm-resolution mapping.
  • Cross-correlation image processing was used to determine strain and GND density from TKD patterns.
  • Analysis focused on SCC-affected grain boundaries, including cracked and uncracked regions, and as-received samples.

Main Results:

  • Cracked grain boundaries exhibited local GND densities exceeding 1 x 10^16 m^-2.
  • As-received grain boundaries showed significantly lower GND densities, around 5 x 10^14 m^-2.
  • Oxidized but uncracked grain boundaries displayed intermediate GND density levels.

Conclusions:

  • Elevated local GND densities are a key factor in triggering SCC initiation in Alloy 600.
  • The study provides a quantitative link between GND accumulation and SCC susceptibility in PWR environments.
  • The TKD-based approach offers a valuable method for probing local conditions related to material degradation.