Insights into the behaviour of structural materials in a molten salt environment

phys.org | 10/23/2018 | Staff
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An international team of researchers led by ANSTO has found that cold-rolling increases the susceptibility of materials to molten salt corrosion by an increase in grain boundary length, and other microstructural defects, which typically contribute to material strengthening.

Dr. Ondrej Muránsky, Lead, High Temperature and Molten Salt Corrosion Performance of Advanced Materials, Nuclear Fuel Cycle at ANSTO and Ms Mia Maric (both pictured above) said that this research has relevance for future Molten Salt Reactor (MSR), Concentrated Solar Thermal (CST) as well as Thermal Energy Storage (TES) systems currently under development.

Study - Corrosion - Science - Stainless - Steel

The study, which was published in Corrosion Science, was done on 316L Stainless Steel which is used in current nuclear reactors and is also being considered as the structural material for future nuclear and non-nuclear energy-generation systems (MSR, CST) as well as energy-storage (TES) systems.

Using electron diffraction and neutron diffraction techniques at ANSTO, the investigators found that cold-rolling leads to an introduction of microstructural defects which make the material stronger but also more susceptible to molten salt corrosion.

Use - High-Resolution - Neutron - Diffraction - HRND

The use of High-Resolution Neutron Diffraction (HRND) on the Echidna instrument revealed an increase in the amount of dislocations, whilst the Electron Back Scatter Diffraction (EBSD) technique revealed an significant increase in the grain boundary length in cold-rolled condition when compared to as-annealed condition.

"HRND and EBSD measurements...
(Excerpt) Read more at: phys.org
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