Change search
Link to record
Permanent link

Direct link
BETA
Pederson, Robert, ProfessorORCID iD iconorcid.org/0000-0002-7675-7152
Publications (10 of 16) Show all publications
Odenberger, E.-L., Pederson, R. & Oldenburg, M. (2019). Finite element modeling and validation of springback and stress relaxation in the thermo-mechanical forming of thin Ti-6Al-4V sheets. The International Journal of Advanced Manufacturing Technology, 104(9-12), 3429-3455
Open this publication in new window or tab >>Finite element modeling and validation of springback and stress relaxation in the thermo-mechanical forming of thin Ti-6Al-4V sheets
2019 (English)In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 104, no 9-12, p. 3429-3455Article in journal (Refereed) Published
Abstract [en]

In this work, a hot forming procedure is developed using computer-aided engineering (CAE) to produce thin Ti-6Al-4V sheet components in an effective way. Traditional forming methods involve time- and cost-consuming furnace heating and subsequent hot sizing steps. A material model for finite element (FE) analyses of sheet metal forming and springback at elevated temperatures in Ti-6Al-4V is calibrated and evaluated. The anisotropic yield criterion proposed by Barlat et al. 2003 is applied, and the time- and temperature-dependent stress relaxation behavior for elastic and inelastic straining are modeled using a Zener–Wert–Avrami formulation. Thermo-mechanical uniaxial tensile tests, a biaxial test, and uniaxial stress relaxation tests are performed and used as experimental reference to identify material model parameters at temperatures up to 700 °C. The hot forming tool setup is manufactured and used to produce double-curved aero engine components at 700 °C with different cycle times for validation purposes. Correlations between the predicted and measured responses such as springback and shape deviation show promising agreement, also when the forming and subsequent holding time was as low as 150 s. The short cycle time resulted in elimination of a detectable alpha case layer. Also, the tool surface coating extends the tool life in combination with a suitable lubricant. © 2019, The Author(s).

Keywords
Aircraft engines; Aluminum alloys; Anisotropy; Computer aided engineering; Hot stamping; Metal forming; Sheet metal; Stress relaxation; Tensile testing; Ternary alloys; Titanium alloys; Vanadium alloys, Aero-engine components; FE analysis; Plastic anisotropy; Spring-back; Stress relaxation behavior; Temperature dependent; Ti-6 Al-4 V; Uniaxial tensile test, Finite element method
National Category
Applied Mechanics Other Materials Engineering Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:hv:diva-14478 (URN)10.1007/s00170-019-04071-9 (DOI)2-s2.0-85068836335 (Scopus ID)
Funder
Vinnova, 2009- 01365;2014-00919
Available from: 2019-10-02 Created: 2019-10-02 Last updated: 2019-11-15
Balachandramurthi, A. R., Moverare, J., Dixit, N., Deng, D. & Pederson, R. (2019). Microstructural influence on fatigue crack propagation during high cycle fatigue testing of additively manufactured Alloy 718. Materials Characterization, 149, 82-94
Open this publication in new window or tab >>Microstructural influence on fatigue crack propagation during high cycle fatigue testing of additively manufactured Alloy 718
Show others...
2019 (English)In: Materials Characterization, ISSN 1044-5803, E-ISSN 1873-4189, Vol. 149, p. 82-94Article in journal (Refereed) Published
Abstract [en]

A study of the microstructure of additively manufactured Alloy 718 was performed in order to better understand the parameters that have an influence on the fatigue properties of the material. The specimens were manufactured using two powder bed fusion techniques – Electron Beam Melting (EBM) and Selective Laser Melting (SLM). Four point bending fatigue tests were performed at room temperature with a stress ratio of R = 0.1 and 20 Hz frequency, on material that was either in hot isostatically pressed (HIP) and solution treated and aged (STA) condition or in STA condition without a prior HIP treatment. The grains in the SLM material in the HIP + STA condition have grown considerably both in the hatch and the contour regions; EBM material, in contrast, shows grain growth only in the contour region. Fractographic analysis of the specimens in HIP + STA condition showed a faceted appearance while the specimens in STA condition showed a more planar crack appearance. The crack propagation occurred in a transgranular mode and it was found that precipitatessuch as NbC, TiN or δ-phase, when present, did not affect the crack path. The areas with larger grains corresponded to the faceted appearance of the fracture surface. This could be attributed to the plastic zone ahead of the crack tip being confined within one grain, in case of the larger grains, which promotes single shear crack growth mode

Keywords
Electron beam melting, Selective laser melting, Alloy 718, Fatigue crack propagation, Microstructure, Hot isostatic pressing
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-13460 (URN)10.1016/j.matchar.2019.01.018 (DOI)000475837800008 ()2-s2.0-85060346504 (Scopus ID)
Funder
Knowledge Foundation, 20160281
Available from: 2019-02-04 Created: 2019-02-04 Last updated: 2019-10-16Bibliographically approved
Balachandramurthi, A. R. & Olsson, J. (2019). Microstructure tailoring in Electron Beam Powder Bed Fusion Additive Manufacturing and its potential consequences. Results in Materials, 1
Open this publication in new window or tab >>Microstructure tailoring in Electron Beam Powder Bed Fusion Additive Manufacturing and its potential consequences
Show others...
2019 (English)In: Results in Materials, ISSN 2590-048X, Vol. 1Article in journal (Refereed) Published
Abstract [en]

Electron Beam Powder Bed Fusion process for Alloy 718 was investigated, in the sense of microstructural evolution with varying process conditions. The existence of a geometric relationship between the melt front and the processing parameters was observed. By understanding and capitalizing on this relationship, it was possible to obtain columnar, equiaxed or bimodal microstructure.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Alloy 718, Texture, Microstructure, Additive manufacturing, Powder bed fusion
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
urn:nbn:se:hv:diva-14331 (URN)10.1016/j.rinma.2019.100017 (DOI)
Available from: 2019-08-26 Created: 2019-08-26 Last updated: 2019-10-30Bibliographically approved
Maimaitiyili, T., Woracek, R., Neikter, M., Boin, M., Wimpory, R. C., Pederson, R., . . . Bjerkén, C. (2019). Residual Lattice Strain and Phase Distribution in Ti-6Al-4V Produced by Electron Beam Melting. Materials, 12(4), Article ID 667.
Open this publication in new window or tab >>Residual Lattice Strain and Phase Distribution in Ti-6Al-4V Produced by Electron Beam Melting
Show others...
2019 (English)In: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 12, no 4, article id 667Article in journal (Refereed) Published
Abstract [en]

Residual stress/strain and microstructure used in additively manufactured material are strongly dependent on process parameter combination. With the aim to better understand and correlate process parameters used in electron beam melting (EBM) of Ti-6Al-4V with resulting phase distributions and residual stress/strains, extensive experimental work has been performed. A large number of polycrystalline Ti-6Al-4V specimens were produced with different optimized EBM process parameter combinations. These specimens were post-sequentially studied by using high-energy X-ray and neutron diffraction. In addition, visible light microscopy, scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD) studies were performed and linked to the other findings. Results show that the influence of scan speed and offset focus on resulting residual strain in a fully dense sample was not significant. In contrast to some previous literature, a uniform α- and β-Ti phase distribution was found in all investigated specimens. Furthermore, no strong strain variations along the build direction with respect to the deposition were found. The magnitude of strain in α and β phase show some variations both in the build plane and along the build direction, which seemed to correlate with the size of the primary β grains. However, no relation was found between measured residual strains in α and β phase. Large primary β grains and texture appear to have a strong effect on X-ray based stress results with relatively small beam size, therefore it is suggested to use a large beam for representative bulk measurements and also to consider the prior β grain size in experimental planning, as well as for mathematical modelling.

National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-13611 (URN)10.3390/ma12040667 (DOI)000460793300117 ()30813435 (PubMedID)2-s2.0-85062212588 (Scopus ID)
Funder
Luleå University of TechnologyEU, European Research Council
Note

Funders: InterReg ESS & MaxIV [MAH-003]; “Nationellt rymdtekniskt forskningsprogram” (NRFP); European Spallation Source–participation of the Czech Republic—OP”, [CZ.02.1.01/0.0/0.0/16 013/0001794]

Available from: 2019-02-27 Created: 2019-02-27 Last updated: 2019-04-02
Balachandramurthi Ramanathan, A., Moverare, J., Mahade, S. & Pederson, R. (2018). Additive Manufacturing of Alloy 718 via Electron Beam Melting: Effect of Post-Treatment on the Microstructure and the Mechanical Properties.. Materials, 12(1), Article ID E68.
Open this publication in new window or tab >>Additive Manufacturing of Alloy 718 via Electron Beam Melting: Effect of Post-Treatment on the Microstructure and the Mechanical Properties.
2018 (English)In: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 12, no 1, article id E68Article in journal (Refereed) Published
Abstract [en]

Alloy 718 finds application in gas turbine engine components, such as turbine disks, compressor blades and so forth, due to its excellent mechanical and corrosion properties at elevated temperatures. Electron beam melting (EBM) is a recent addition to the list of additive manufacturing processes and has shown the capability to produce components with unique microstructural features. In this work, Alloy 718 specimens were manufactured using the EBM process with a single batch of virgin plasma atomized powder. One set of as-built specimens was subjected to solution treatment and ageing (STA); another set of as-built specimens was subjected to hot isostatic pressing (HIP), followed by STA (and referred to as HIP+STA). Microstructural analysis of as-built specimens, STA specimens and HIP+STA specimens was carried out using optical microscopy and scanning electron microscopy. Typical columnar microstructure, which is a characteristic of the EBM manufactured alloy, was observed. Hardness evaluation of the as-built, STA and HIP+STA specimens showed that the post-treatments led to an increase in hardness in the range of ~50 HV1. Tensile properties of the three material conditions (as-built, STA and HIP+STA) were evaluated. Post-treatments lead to an increase in the yield strength (YS) and the ultimate tensile strength (UTS). HIP+STA led to improved elongation compared to STA due to the closure of defects but YS and UTS were comparable for the two post-treatment conditions. Fractographic analysis of the tensile tested specimens showed that the closure of shrinkage porosity and the partial healing of lack of fusion (LoF) defects were responsible for improved properties. Fatigue properties were evaluated in both STA and HIP+STA conditions. In addition, three surface conditions were also investigated, namely the 'raw' as-built surface, the machined surface with the contour region and the machined surface without the contour region. Machining off the contour region completely together with HIP+STA led to significant improvement in fatigue performance.

Keywords
Alloy 718, electron beam melting, fatigue properties, microstructure, tensile properties, texture
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
urn:nbn:se:hv:diva-13364 (URN)10.3390/ma12010068 (DOI)000456410200068 ()30585242 (PubMedID)2-s2.0-85059182911 (Scopus ID)
Funder
Knowledge Foundation, 20160281
Available from: 2019-01-08 Created: 2019-01-08 Last updated: 2019-05-27Bibliographically approved
Neikter, M., Woracek, R., Maimaitiyili, T., Scheffzük, C., Strobl, M., Antti, M.-L., . . . Bjerkén, C. (2018). Alpha texture variations in additive manufactured Ti-6Al-4V investigated with neutron diffraction. Additive Manufacturing, 23, 225-234
Open this publication in new window or tab >>Alpha texture variations in additive manufactured Ti-6Al-4V investigated with neutron diffraction
Show others...
2018 (English)In: Additive Manufacturing, ISSN 2214-8604, Vol. 23, p. 225-234Article in journal (Refereed) Published
Abstract [en]

Variation of texture in Ti-6Al-4V samples produced by three different additive manufacturing (AM) processes has been studied by neutron time-of-flight (TOF) diffraction. The investigated AM processes were electron beam melting (EBM), selective laser melting (SLM) and laser metal wire deposition (LMwD). Additionally, for the LMwD material separate measurements were done on samples from the top and bottom pieces in order to detect potential texture variations between areas close to and distant from the supporting substrate in the manufacturing process. Electron backscattered diffraction (EBSD) was also performed on material parallel and perpendicular to the build direction to characterize the microstructure. Understanding the context of texture for AM processes is of significant relevance as texture can be linked to anisotropic mechanical behavior. It was found that LMwD had the strongest texture while the two powder bed fusion (PBF) processes EBM and SLM displayed comparatively weaker texture. The texture of EBM and SLM was of the same order of magnitude. These results correlate well with previous microstructural studies. Additionally, texture variations were found in the LMwD sample, where the part closest to the substrate featured stronger texture than the corresponding top part. The crystal direction of the α phase with the strongest texture component was [112¯3]. © 2018 Elsevier B.V.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Neutron time-of-flight diffraction, SKAT, Texture, Ti-6Al-4V, Additive manufacturing
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-12979 (URN)10.1016/j.addma.2018.08.018 (DOI)000453495500022 ()2-s2.0-85051782355 (Scopus ID)
Note

Funders: InterReg ESS & MaxIV: Cross Border Science and Society, MAH-003; Joint Institute for Nuclear Research, 2016-10-14-12-57-50, 2016-10-14-12-49-17; Nationellt rymdtekniskt forskningsprogram (NRFP);  EU funded Space for innovation and growth (RIT); Graduate School of Space Technology at Luleå University of Technology; OP RDE . MEYS, under the project “European Spallation Source – participation of the Czech Republic – OP”, Reg. No. CZ.02.1.01/0.0/0.0/16013/00

Available from: 2018-10-26 Created: 2018-10-26 Last updated: 2019-05-24Bibliographically approved
Åkerfeldt, P., Hörnqvist Colliander, M., Pederson, R. & Antti, M.-L. (2018). Electron backscatter diffraction characterization of fatigue crack growth in laser metal wire deposited Ti-6Al-4V. Materials Characterization, 135, 245-256
Open this publication in new window or tab >>Electron backscatter diffraction characterization of fatigue crack growth in laser metal wire deposited Ti-6Al-4V
2018 (English)In: Materials Characterization, ISSN 1044-5803, E-ISSN 1873-4189, Vol. 135, p. 245-256Article in journal (Refereed) Published
Abstract [en]

By additive manufacturing (AM) there is a feasibility of producing near net shape components in basically one step from 3D CAD model to final product. The interest for AM is high and during the past decade a lot of research has been carried out in order to understand the influence from process parameters on the microstructure and furthermore on the mechanical properties. In the present study laser metal wire deposition of Ti-6Al-4V has been studied in detail with regard to its fatigue crack propagation characteristics. Two specimen orientations, parallel and perpendicular to the deposition direction, have been evaluated at room temperature and at 250 °C. No difference in the fatigue crack growth rate could be confirmed for the two specimen orientations. However, in the fractographic study it was observed that the tortuosity varied between certain regions on the fracture surface. The local crack path characteristic could be related to the alpha colony size and/or the crystallographic orientation. Moreover, large areas exhibiting similar crystallographic orientation were observed along the prior beta grain boundaries, which were attributed to the wide alpha colonies frequently observed along the prior beta grain boundaries. © 2017 Elsevier Inc.

Keywords
Aluminum; Aluminum alloys; Computer aided design; Crack propagation; Deposition; Fatigue crack propagation; Grain boundaries; Ternary alloys; Titanium alloys; Vanadium alloys, 3D CAD Modeling; Crystallographic orientations; Electron back scatter diffraction; Fractographic; Fracture surfaces; Near-net-shape components; Process parameters; Specimen orientation, Cracks
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-11917 (URN)10.1016/j.matchar.2017.11.041 (DOI)000423248200029 ()2-s2.0-85034988961 (Scopus ID)
Note

Funders:  NFFP (the National Aviation Engineering Research Program) 

Available from: 2017-12-13 Created: 2017-12-13 Last updated: 2019-05-27Bibliographically approved
Fargas, G., Roa, J. J., Sefer, B., Pederson, R., Antti, M.-L. -. & Mateo, A. (2018). Influence of cyclic thermal treatments on the oxidation behavior of Ti-6Al-2Sn-4Zr-2Mo alloy. Materials Characterization, 145, 218-224
Open this publication in new window or tab >>Influence of cyclic thermal treatments on the oxidation behavior of Ti-6Al-2Sn-4Zr-2Mo alloy
Show others...
2018 (English)In: Materials Characterization, ISSN 1044-5803, E-ISSN 1873-4189, Vol. 145, p. 218-224Article in journal (Refereed) Published
Abstract [en]

Ti-6Al-2Sn-4Zr-2Mo is one of the most common titanium alloys for aerospace industry. This alloy experiences oxidation phenomenon at elevated temperatures. In the present study, cyclic thermal treatments were performed in air at 500, 593 and 700 °C, up to 500 cycles, in order to determine the oxidation kinetics and to analyze the oxide scale and alpha-case formation. Moreover, results were compared to those achieved under isothermal conditions to elucidate differences between both thermal conditions. In this sense, metallographic techniques and X-ray diffraction, together with a detailed advanced characterization of the microstructure by Field Emission Scanning Electron Microscopy and Focus Ions Beam, were used to analyze surface oxidation evolution. Results pointed out that cyclic treatments induced a strong increase of the weight gain compared to isothermal treatments. The analysis of the oxide scale revealed the formation of not only rutile, as isothermal treatments, but also anatase. Thickness of the oxide scale was higher for cyclic conditions, while alpha case did not exceed values reached by isothermal treatments and even became lower at 500 °C.

Keywords
Aerospace industry, Aluminum alloys, Field emission microscopes, Heat treatment, Isotherms, Metallography, Molybdenum alloys, Oxidation, Oxide minerals, Scale (deposits), Scanning electron microscopy, Tin alloys, Titanium, Titanium dioxide, Zirconium alloys, Alpha case, Elevated temperature, Field emission scanning electron microscopy, Isothermal conditions, Isothermal treatment, Metallographic technique, Oxidation behaviors, Surface oxidations, Titanium alloys
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
urn:nbn:se:hv:diva-12955 (URN)10.1016/j.matchar.2018.08.049 (DOI)000449449200023 ()2-s2.0-85052644847 (Scopus ID)
Funder
Swedish Foundation for Strategic Research
Note

Funders inisterio de Economía y Competitividad (MINECO/FEDER), MAT2015-70780-C4-3-P;  Erasmus Mundus Programme through the European Joint Doctoral Programme in Materials Science and Engineering Programme (DocMASE, Grant number 512225-1-2010-1-DE-ERA MUNDUS-EMJD.

Available from: 2018-09-27 Created: 2018-09-27 Last updated: 2019-05-27Bibliographically approved
Balachandramurthi, A. R., Moverare, J., Dixit, N. & Pederson, R. (2018). Influence of defects and as-built surface roughness on fatigue properties of additively manufactured Alloy 718. Materials Science & Engineering: A, 735, 463-474
Open this publication in new window or tab >>Influence of defects and as-built surface roughness on fatigue properties of additively manufactured Alloy 718
2018 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 735, p. 463-474Article in journal (Refereed) Published
Abstract [en]

Electron beam melting (EBM) and Selective Laser Melting (SLM) are powder bed based additive manufacturing (AM) processes. These, relatively new, processes offer advantages such as near net shaping, manufacturing complex geometries with a design space that was previously not accessible with conventional manufacturing processes, part consolidation to reduce number of assemblies, shorter time to market etc. The aerospace and gas turbine industries have shown interest in the EBM and the SLM processes to enable topology-optimized designs, parts with lattice structures and part consolidation. However, to realize such advantages, factors affecting the mechanical properties must be well understood – especially the fatigue properties. In the context of fatigue performance, apart from the effect of different phases in the material, the effect of defects in terms of both the amount and distribution and the effect of “rough” as-built surface must be studied in detail. Fatigue properties of Alloy 718, a Ni-Fe based superalloy widely used in the aerospace engines is investigated in this study. Four point bending fatigue tests have been performed at 20 Hz in room temperature at different stress ranges to compare the performance of the EBM and the SLM material to the wrought material. The experiment aims to assess the differences in fatigue properties between the two powder bed AM processes as well as assess the effect of two post-treatment methods namely – machining and hot isostatic pressing (HIP). Fractography and metallography have been performed to explain the observed properties. Both HIPing and machining improve the fatigue performance; however, a large scatter is observed for machined specimens. Fatigue properties of SLM material approach that of wrought material while in EBM material defects severely affect the fatigue life. © 2018 Elsevier B.V.

Keywords
Additive manufacturing, Alloy 718, Fatigue, Surface roughness, Hot isostatic pressing, 3D printers, Bending tests, Binary alloys, Fatigue testing, Fighter aircraft, Fracture mechanics, Gas turbines, Hot isostatic pressing, Iron alloys, Mechanical properties, Melting, Nickel alloys, Sintering, Surface roughness, Alloy 718, Conventional manufacturing, Fatigue performance, Gas turbine industry, Lattice structures, Manufacturing complex, Post-treatment method, Selective laser melting, Fatigue of materials
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
urn:nbn:se:hv:diva-12956 (URN)10.1016/j.msea.2018.08.072 (DOI)000447117300055 ()2-s2.0-85052655828 (Scopus ID)
Funder
Knowledge Foundation, 20160281
Note

Available online 23 August 2018

Available from: 2018-09-27 Created: 2018-09-27 Last updated: 2019-05-28Bibliographically approved
Neikter, M., Åkerfeldt, P., Pederson, R. & Antti, M.-L. -. (2018). Microstructural characterization and comparison of Ti-6Al-4V manufactured with different additive manufacturing processes. Materials Characterization, 143, 68-75
Open this publication in new window or tab >>Microstructural characterization and comparison of Ti-6Al-4V manufactured with different additive manufacturing processes
2018 (English)In: Materials Characterization, ISSN 1044-5803, E-ISSN 1873-4189, Vol. 143, p. 68-75Article in journal (Refereed) Published
Abstract [en]

In this work, the microstructures of Ti-6Al-4V manufactured by different additive manufacturing (AM) processes have been characterized and compared. The microstructural features that were characterized are the α lath thickness, grain boundary α (GB-α) thickness, prior β grain size and α colony size. In addition, the microhardnesses were also measured and compared. The microstructure of shaped metal deposited (SMD) Ti-6Al-4V material showed the smallest variations in α lath size, whereas the material manufactured with laser metal wire deposition-0 (LMwD-0) showed the largest variation. The prior β grain size was found to be smaller in material manufactured with powder bed fusion (PBF) as compared with corresponding material manufactured with the directed energy deposition (DED) processes. Parallel bands were only observed in materials manufactured with DED processes while being non-present in material manufactured with PBF processes.

Keywords
Additive manufacturing, Shaped metal deposition, Selective laser melting, Electron beam melting, Laser metal wire/powder deposition, Ti-6Al-4V
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-12078 (URN)10.1016/j.matchar.2018.02.003 (DOI)000448099000009 ()2-s2.0-85042273976 (Scopus ID)
Funder
Luleå University of Technology
Note

Available online 10 February 2018

Funders: Nationellt rymdtekniskt forskningsprogram (NRFP) ;  EU, Space for innovation and growth (RIT).

Available from: 2018-02-22 Created: 2018-02-22 Last updated: 2019-01-25Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-7675-7152

Search in DiVA

Show all publications