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View article: Assessment of large-scale heterogeneity due to toughness variations in a multipass weld: brittle failure mechanisms and modeling
Assessment of large-scale heterogeneity due to toughness variations in a multipass weld: brittle failure mechanisms and modeling Open
The fracture surfaces of 49 SE(B) toughness tests performed on five different geometries, were carefully investigated by SEM imaging and cross-section analysis. The specimens were extracted from a large multi-pass weld in T-S orientation. …
View article: Irradiation-induced clustering in a high-Ni, high-Mn, low-Cu boiling water reactor pressure vessel weld after 28 full power years
Irradiation-induced clustering in a high-Ni, high-Mn, low-Cu boiling water reactor pressure vessel weld after 28 full power years Open
High-Ni, high-Mn welds are the life-time determining components in reactor pressure vessels (RPVs) of Nordic reactors at desired operating times of pressurized water reactors (PWR) of 60 or even 80 years due to embrittlement that is caused…
View article: Mechanical Characterization of Fatigue and Cyclic Plasticity of 304L Stainless Steel at Elevated Temperature
Mechanical Characterization of Fatigue and Cyclic Plasticity of 304L Stainless Steel at Elevated Temperature Open
Background The mechanical characterization of the cyclic elastoplastic response of structural materials at elevated temperatures is crucial for understanding and predicting the fatigue life of components in nuclear reactors. Objective In t…
View article: An experimental fracture mechanics study of the combined effect of hydrogen embrittlement and loss of constraint
An experimental fracture mechanics study of the combined effect of hydrogen embrittlement and loss of constraint Open
This work presents a systematic investigation of the combined effect of hydrogen embrittlement and loss of constraint. The fracture mechanics experiments are performed on an advanced martensitic high strength steel using a single-edge-notc…
View article: Elemental distribution in a decommissioned high Ni and Mn reactor pressure vessel weld metal from a boiling water reactor
Elemental distribution in a decommissioned high Ni and Mn reactor pressure vessel weld metal from a boiling water reactor Open
In this paper, weld metal from unique material of a decommissioned boiling water reactor pressure vessel is investigated. The reactor was in operation for 23 effective full power years. The elemental distribution of Ni, Mn, Si and Cu in th…
View article: Mechanical behavior of high-Ni/high-Mn Barsebäck 2 reactor pressure vessel welds after 28 years of operation
Mechanical behavior of high-Ni/high-Mn Barsebäck 2 reactor pressure vessel welds after 28 years of operation Open
To assess long-term operation of the reactor pressure vessel (RPV), surveillance programs are applied for periodic monitoring and prediction of the aging of the mechanical properties due to irradiation and thermal embrittlement. In literat…
View article: Brittle fracture initiation in decommissioned boiling water reactor pressure vessel head weld
Brittle fracture initiation in decommissioned boiling water reactor pressure vessel head weld Open
The brittle fracture initiation behavior and fracture toughness in the ductile-to-brittle transition region for a thermally-aged weld metal of a decommissioned reactor pressure vessel head (in operation at 288 °C for 23 effective full powe…
View article: Materials for Sustainable Nuclear Energy: A European Strategic Research and Innovation Agenda for All Reactor Generations
Materials for Sustainable Nuclear Energy: A European Strategic Research and Innovation Agenda for All Reactor Generations Open
Nuclear energy is presently the single major low-carbon electricity source in Europe and is overall expected to maintain (perhaps eventually even increase) its current installed power from now to 2045. Long-term operation (LTO) is a realit…
View article: Post-irradiation annealing of high flux irradiated and surveillance material reactor pressure vessel weld metal
Post-irradiation annealing of high flux irradiated and surveillance material reactor pressure vessel weld metal Open
In this study, high flux irradiated and surveillance high Ni and Mn and low Cu welds identical to those of the belt-line region of Ringhals R4 were subjected to annealing at temperatures between 390 and 455 °C for 24–30 h, in order to stud…
View article: Analysis of thermal embrittlement of a low alloy steel weldment using fracture toughness and microstructural investigations
Analysis of thermal embrittlement of a low alloy steel weldment using fracture toughness and microstructural investigations Open
A thermally aged low alloy steel weld metal is investigated in terms of its fracture toughness and microstructural evolution and compared to a reference. The main purpose of the study is to investigate the effects of embrittlement due to t…
View article: Simulation of Slip-Oxidation Process by Mesh Adaptivity in a Cohesive Zone Framework
Simulation of Slip-Oxidation Process by Mesh Adaptivity in a Cohesive Zone Framework Open
Adaptive oxide thickness was developed in a cohesive element based multi-physics model including a slip-oxidation and diffusion model. The model simulates the intergranular stress corrosion cracking (IGSCC) in boiling water reactors (BWR).…
View article: Baseline Examinations and Autoclave Tests of 65 and 100 dpa Flux Thimble Tube O-Ring Specimens
Baseline Examinations and Autoclave Tests of 65 and 100 dpa Flux Thimble Tube O-Ring Specimens Open
This paper describes the methods and results of analytical TEM examinations and autoclave testing of two highly-irradiated flux thimble tube materials harvested from a commercial pressurized water reactor. The materials are cold-worked 316…
View article: Effect of weld microstructure on brittle fracture initiation in the thermally-aged boiling water reactor pressure vessel head weld metal
Effect of weld microstructure on brittle fracture initiation in the thermally-aged boiling water reactor pressure vessel head weld metal Open
Effects of the weld microstructure and inclusions on brittle fracture initiation are investigated in a thermally aged ferritic high-nickel weld of a reactor pressure vessel head from a decommissioned nuclear power plant. As-welded and rehe…
View article: Integrated effect of thermal ageing and low flux irradiation on microstructural evolution of the ferrite of welded austenitic stainless steels
Integrated effect of thermal ageing and low flux irradiation on microstructural evolution of the ferrite of welded austenitic stainless steels Open
With the purpose to quantify microstructural changes with respect to ageing degradation, the microstructure of aged type 308 stainless steel welds with a ferrite content of 5-7% has been analysed using atom probe tomography. The weld metal…
View article: A duplex oxide cohesive zone model to simulate intergranular stress corrosion cracking
A duplex oxide cohesive zone model to simulate intergranular stress corrosion cracking Open
A finite element model with slip-oxidation is proposed for solving intergranular stress corrosion cracking (IGSCC) with duplex oxides. The purpose is to investigate the crack growth effect due to different rate, compositions and kinetics o…
View article: A weakest link model for multiple mechanism brittle fracture — Model development and application
A weakest link model for multiple mechanism brittle fracture — Model development and application Open
A multiple mechanism weakest link model for intergranular and transgranular brittle fracture is developed on the basis of experimental observations of a thermally aged low alloy steel. The model development is carried out in tandem with mi…
View article: Atom Probe Tomography of Oxidised Grain Boundaries in Highly Irradiated SS316
Atom Probe Tomography of Oxidised Grain Boundaries in Highly Irradiated SS316 Open
are larger than the ones detected in the matrix of the grains, but the composition is similar (Ni/Si ratio of around 2.4).The boundary composition a few micrometres from the oxide was in essence similar to other grain boundaries from the s…
View article: Data for: Overcoming the drawbacks of plastic strain estimation based on KAM
Data for: Overcoming the drawbacks of plastic strain estimation based on KAM Open
Electron backscatter diffraction data sets used in this work. The files named 00, 03, 06, 09, 12 and 15.ctf are from the reference specimens, and the filenames represent the approximate nominal plastic strains applied. The files CRDM1, CRD…