Przemyslaw Klups

Profile Information
Name
Mr. Przemyslaw Klups
Institution
University of Oxford
Position
Post-graduate Research Student
h-Index
1
ORCID
0000-0002-6871-3221
Biography

I am interested in how grain boundary structures affect segregation and clustering in RPV steels. In a broader context, I am trying to separate thermal and radiation components from the changes occurring in RPV steels by conducting long-term thermal ageing experiments on the same alloys that have been neutron-irradiated.

Expertise
APT, Atom Probe Tomography, Manganese Nickel Silicon Precipitates (MNSP), Reactor Pressure Vessel (RPV)
Publications:
"Using spherical indentation to measure the strength of copper-chromium-zirconium" Przemyslaw Klups, Alexandra Cackett, Joven Lim, Andy J. Bushby, Chris Hardie, Journal of Nuclear Materials Vol. 511 2018 610-3115 Link
Precipitation hardened CuCrZr will be used in heat-sink components in the ITER tokomak and is a primary candidate for EU DEMO. The measurement of mechanical properties of irradiated CuCrZr using conventional, standardised techniques is difficult due to the challenges involved in working with radioactive material and the relatively large specimen size required. Spherical nano-indentation offers a technique to measure stress-strain properties from far smaller volumes than conventional tests. In this work, CuCrZr has been heat-treated at different temperatures to vary the Cr precipitate size and spacing. Spherical nano-indentation using multiple tip radii was then used to produce stress-strain curves for all samples, from which values of initial flow stress were calculated. It was found that there was a strong indentation size effect (ISE) in the stress required to initiate plasticity, however at higher indentation strains the flow stress became constant for tip radii, R, ≥8 μm. This suggests that at the initiation of plastic deformation the ISE is dominated by dislocation source activation but in later stages the interaction with microstructural material length-scales dominate the measured mechanical strength. The mechanical response of these small-scale tests is governed by multiple mechanisms, which convolute interpretation of data and must be considered when measuring the effects of irradiation on the mechanical properties.
Presentations:
"Multi-technique Analysis of Grain Boundaries in Low-Alloy Steels (poster)" Przemyslaw Klups, Ben Jenkins, James Douglas, Nick Riddle, Jonathan Hyde, Paul Bagot, Michael Moody, European Workshop on Atom Probe Tomography November 12-14, (2019)
"Multi-technique Analysis of Low-Alloy SteelsFrom the Micro-to Nano-scale" Przemyslaw Klups, Nick Riddle, Jonathan Hyde, Paul Bagot, Michael Moody, Ben Jenkins, James Douglas, Rolls-Royce Doctorate Conference 2020 December 9-11, (2020)
"PosgenPy: Finding Optimal Parameters for Cluster Search in APT (video-poster)" Przemyslaw Klups, Dan Haley, Andrew London, Hazel Gardner, James Famelton, Paul Bagot, Michael Moody, APT&M 2020 November 16-18, (2020)