Blar i NTNU Open på forfatter "Roven, Hans Jørgen"
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Achieving dispersed fine soft Bi particles and grain refinement in a hypermonotectic Al-Bi alloy by severe plastic deformation and annealing
Zha, Min; Yu, Zhiyuan; Qian, Feng; Wang, Huiyuan; Li, Yanjun; Mathiesen, Ragnvald; Roven, Hans Jørgen (Journal article; Peer reviewed, 2018)The present work revealed that equal-channel angular pressing (ECAP) deformation combined with appropriate annealing could represent as an efficient route to modify immiscible as-cast microstructure of a monotectic Al–8Bi ... -
Application of EBSD technique to ultrafine grained and nanostructured materials processed by severe plastic deformation: Sample preparation, parameters optimization and analysis
Chen, Yongjun; Hjelen, Jarle; Roven, Hans Jørgen (Journal article; Peer reviewed, 2012)With the help of FESEM, high resolution electron backscatter diffraction can investigate the grains/subgrains as small as a few tens of nanometers with a good angular resolution (∼0.5°). Fast development of EBSD speed (up ... -
Applications of screw extrusion for pure aluminium and aluminium foils
Værnes, Martin Storli (Master thesis, 2018)This thesis has assessed the effect of the screw extrusion process on a super pure aluminium Ø 3mm wire. This thesis also determined that commercial quality aluminium foil can be screw extruded using the prototype found ... -
Characterisation of an aluminium matrix nanocomposite wire manufactured by screw extrusion
Ragnvaldsen, Olav (Master thesis, 2019)Kontinuerleg skrueekstrusjon av metaller (Metal Continuous Scew Extrusion, MCSE) er ein nyutvikla, fast tilstands produksjonsmetode, som tilrettelegg for framstilling av metallegeringar og komposittar med nye eigenskapar. ... -
Characterisation of Feed and Produced Material in Screw Extrusion of Titanium
Meling, Jan Inge Hammer (Master thesis, 2016)A novel method of extrusion of materials with high viscosity is being developed at NTNU, the method is based on screw extrusion, which is more known in the plastic industry. The process, at the end of the development cycle ... -
Characterization and Mechanical Testing of Co-Extruded Rods with an AA6082 Core and Rapidly Solidified AA7090/AA7090-Sc Sleeve
Bjerkestrand, Vegard Jørgenvåg (Master thesis, 2018)The development and implementation of materials having a combination of mechanical properties, e.g. high strength and high ductility, have been of interest within the material science community for decades. In the growing ... -
Characterization and Optimization of AlSi10Mg-Components Produced by Selective Laser Melting
Holm, Håkon Dehli (Master thesis, 2018)The additive manufacturing process known as selective laser melting (SLM) produces metallic parts directly from a computer aided design (CAD)-model, by selectively melting metallic powder particles together in a layer-by-layer ... -
Characterization of Aluminium Components Produced by Additive Manufacturing
Rønneberg, Tobias (Master thesis, 2016)Additive manufacturing (AM) is a new method of manufacturing that can produce physical objects directly from CAD-models. Powder Bed Fusion (PBF) technology can produce metallic parts by selectively fusing powders layer by ... -
Characterization of Coextruded Rods with Al-4,5Mg as the Base Alloy and Rapidly Solidified Al-4,5Mg-1Ag as the Surface Alloy
Kalager, Harald (Master thesis, 2017)Coextruded rods with Al-4,5wt%Mg as the base alloy and rapidly solidified Al-4,5wt%Mg-1wt%Ag as the surface alloy has been characterized. Precipitation hardening, light microscopyand scanning electron microscopy (SEM) ... -
Characterization of extruded Aluminium
Skorpen, Kristian Grøtta (Master thesis, 2011)A new method of continuous extrusion of aluminium, utilizing a screw tocompact scrap material into an extrusion prole, is being developed. Suchdirect recycling shows great advantages compared to traditional extrusion,especially ... -
Characterization of Screw Extruded Rapid Solidified AA6061
Stedje, Thorstein Jacobsen (Master thesis, 2014)By using rapid solidified aluminium as feedstock and a novel extrusion method, i.e. screw extrusion, it is possible to extrude aluminium continuously. Due to rapid solidification, the base material can have small grain ... -
Comparative study of eutectic Al-Si alloys manufactured by WAAM and casting
Langelandsvik, Geir; Horgar, Annbjørg; Furu, Trond; Roven, Hans Jørgen; Akselsen, Odd Magne (Peer reviewed; Journal article, 2020)Wire and arc additive manufacturing (WAAM) of metallic materials is expected to become part of the new industrial revolution. The possibilities for complex designs and superior mechanical properties can in many cases replace ... -
Corrosion Fatigue of AA6082 Aluminium Alloy: The Effects of Coating and Ti Additions
Fredrikstad, Joakim Enger (Master thesis, 2019)Effektene av anodisering og organisk belegg (KTL) på korrosjonsutmattingsegenskapene til en ekstrudert AA6082 aluminiumslegering ble undersøkt. Ubelagte og anodiserte prøver med ekstra Ti i legeringen ble også testet. En ... -
Corrosion fatigue of an extruded 7046 alloy
Christiansen, Kyrre Stefansson (Master thesis, 2018)The corrosion fatigue properties of a 7046 alloy were investigated and compared to previously reported work by SINTEF on the same alloy tested in air. To establish the corrosion fatigue properties, samples were either ... -
Corrosion Fatigue of Extruded AA6082 Aluminium Alloy - The effects of Surface Roughness: Machined, Punched, and Counter Trimmed Surfaces
Lindstad, Gaute Tomassen (Master thesis, 2017)The aim of this master s thesis is to investigate the corrosion fatigue properties of an extruded AA6082 alloy. Surface roughness deeply affects fatigue and corrosion fatigue. Surface roughness depends on the shaping ... -
Cryogenic temperature deformation behaviour of two Al-Mg-Si alloys
Xu, Zebing (Doctoral theses at NTNU;2017:11, Doctoral thesis, 2017)A comprehensive study was carried out to clarify the effects of cryogenic temperature on mechanical properties and microstructure of two peak-aged Al-Mg-Si profiles, i.e., fully recrystallized AA6060 and fibrous AA6082. ... -
Deformation defects and electron irradiation effect in nanostructured Al-Mg alloy processed by severe plastic deformation
Liu, Manping; Sun, Shaochun; Roven, Hans Jørgen; Yu, Yingda; Zhang, Zhen; Murashkin, Maxim; Valiev, Ruslan Z. (Journal article; Peer reviewed, 2012)In order to explore the exact nature of deformation defects previously observed in nanostructured Al-Mg alloys subjected to severe plastic deformation, a more thorough examination of the radiation effect on the formation ... -
Degreasing of aluminum turnings and implications for solid state recycling
Cui, Jirang; Kvithyld, Anne; Roven, Hans Jørgen (Chapter, 2010)With the global warming being of concern, recycling of aluminum by new solid-state recycling techniques instead of conventional remelting and subsequent refining processing has been taken into account. Solid-state recycling ... -
DSC analyses of static and dynamic precipitation of an Al-Mg-Si-Cu aluminum alloy
Liu, Manping; Wu, Zhenjie; Yang, Rui; Wei, Jiangtao; Yu, Yingda; Skaret, Pål Christian; Roven, Hans Jørgen (Journal article; Peer reviewed, 2015)In the present investigation, both static and dynamic precipitations of an Al–Mg–Si–Cu aluminum alloy after solid-solution treatment (SST) were comparatively analyzed using differential scanning calorimetry (DSC). Dynamic ... -
Effect of cryorolling on microstructure and mechanical properties of a peak-aged AA6082 extrusion
Xu, Zebing; Liu, Manping; Jia, Zhihong; Roven, Hans Jørgen (Journal article; Peer reviewed, 2017)Peak-aged AA6082 flat extrusions were cryorolled at liquid nitrogen temperature to three different thickness reductions, the reductions were 21%, 42% and 85%, respectively. Microstructure and plastic deformation behaviors ...