Browsing NTNU Open by Author "Westermann, Ida"
Now showing items 1-20 of 70
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A methodology to assess the spatial distribution of dispersoids in AL-MG-Si alloys
Marthinsen, Knut; Westermann, Ida; Remøe, Magnus Sætersdal (Chapter, 2018)Al-Mg-Si alloys often add small additions of e.g. Mn or Cr, to form dispersoids, which may act as nucleation sites for Mg2Si particles after homogenization. The purpose is to ensure a high density of uniformly distributed ... -
Additive Manufacturing of Inconel 625 - Corrosion Properties
Kristina Espedal Kindem (Master thesis, 2021)Inconel 625 (IN625) er en nikkelbasert superlegering med utmerket korrosjonsbestandighet og styrke ved høye temperaturer. Derfor har den blitt brukt i flere industrier som opererer under tøffe forhold. Eksempler på ... -
Additive Manufacturing with Corrosion Resistant Alloys (CRA) - Microstructure and Mechanical Properties of Inconel 625
Lund, Selma (Master thesis, 2021)Denne masteroppgaven har som mål å bidra til økt forståelse av hvordan additive tilvirknings (AM) teknologier som selektiv lasersmelting (SLM) påvirker mikrostruktur og mekaniske egenskaper av Inconel 625 (IN625), sammenlignet ... -
Aluminum alloys as reinforcement in concrete constructions: Opportunities and Challenges
Runningen, Ingvild (Master thesis, 2021)Abstract will be available on 2024-06-17 -
An experimental study on the deformation and fracture modes of steel projectiles during impact
Rakvåg, Knut Gaarder; Børvik, Tore; Westermann, Ida; Hopperstad, Odd Sture (Journal article, 2013)Previous investigations of the penetration and perforation of high-strength steel plates struck by hardened steel projectiles have shown that under certain test conditions the projectile may fracture or even fragment upon ... -
Characterization of the Density and Spatial Distribution of Dispersoids in Al-Mg-Si Alloys
Remøe, Magnus Sætersdal; Westermann, Ida; Marthinsen, Knut (Journal article; Peer reviewed, 2019)Al-Mg-Si alloys often contain small additions of, for example, Mn or Cr, to form dispersoids, which may act as nucleation sites for Mg2Si particles after homogenization. The purpose of adding Mn and Cr is to ensure a high ... -
Characterization of the Microstructural Development through Screw Extrusion of AA6060 and AA6082
Sveen, Ola (Master thesis, 2021)Økt resirkulering av materialer vil spille en avgjørende rolle i å fremskynde overgangen til en mer bærekraftig fremtid og sirkulær økonomi. Skruekstrudering er en nyskapende resirkuleringsteknologi som omdanner skrap til ... -
Characterizing the damage mechanisms of orthopedic joint prostheses
Johannessen, Anette (Master thesis, 2021)Dette prosjektet undersøkte tre brukte hofteleddsproteser med hensikt å forstå hvilke skademekanismer som var til stede og hvorfor disse oppsto. En rekke metallurgiske undersøkelser ble benyttet for å avdekke overflateka ... -
Cold welding of steel and aluminum alloys - Joining processes, intermetallic phases and bond strength
Arbo, Siri Marthe (Doctoral theses at NTNU;2020:16, Doctoral thesis, 2020)Steel and aluminum are two of the most commonly used metals in today’s society and can be found everywhere, in vehicles, buildings, ships, and in most new electronic devices to name a few. Both metals have desirable ... -
Comparing In Situ DIC Results from an Etched Surface with a Gold Speckled Surface
Paulsen, Christian Oen; Fagerholt, Egil; Børvik, Tore; Westermann, Ida (Journal article; Peer reviewed, 2019)A ferrite-pearlite two-phase steel was investigated using in situ scanning electron microscope (SEM) tensile testing combined with digital image correlation (DIC). Two different speckled patterns were used and compared. ... -
Crystal plasticity finite element simulations of pure bending of aluminium alloy AA7108
Saai, Afaf; Westermann, Ida; Dumoulin, Stephane; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2015)The crystal plasticity finite element method (CP-FEM) is used to investigate the influence of microstructure on the bending behaviour of the heat treatable aluminium alloy AA7108. The study comprises two materials obtained ... -
Depth profiling at a steel-aluminum interface using slow-flow direct current glow discharge mass spectrometry
Paudel, Gagan; Langelandsvik, Geir; Khromov, Sergey; Arbo, Siri Marthe; Westermann, Ida; Roven, Hans Jørgen; Di Sabatino Lundberg, Marisa (Journal article; Peer reviewed, 2021) -
Development of Environment-Friendly Concrete Constructions by use of Aluminium Reinforcement
Kleinau, Karl F. (Master thesis, 2022)Sementproduksjon utgjør det tredje største CO2-utslippet i moderne tid og står for 8% av de globale utslippene med 4,1 milliarder metriske tonn årlig. Videre fører korrosjon av armeringsstål til reduksjon i funksjonalitet ... -
Dispersoid Structures and Properties of Cr and Zr-containing 6xxx Extrusion Alloys
Tofte, Anne (Master thesis, 2015)The overall objective of this work has been to study the dispersoid structures introduced by adding Cr and Zr to an AA6082 alloy and other features which may influence and improve the mechanical properties of the alloy. ... -
Distinguishing bainitic and martensitic microstructures in high strength steels using advanced characterization methods
Asheim, Kristin Grue (Master thesis, 2020)Gjennom dette arbeidet har to legeringer; 103Cr3/103C3 og 34CrNiMo6, blitt varmebehandlet til perlittisk/ferritisk, bainittisk og martensittisk struktur for å bli studert i SEM. Å skille mellom bainittiske og martensittiske ... -
EBSD Characterization of the Microstructure Evolution in (σ, χ)-containing SDSS Subjected to Long Term Heating
Haukali, Mona; Westermann, Ida; Karlsen, Morten; Hjelen, Jarle (Journal article; Peer reviewed, 2019)Super duplex stainless steels (SDSS) are used in oil wells with high temperature and high pressure in the oil and gas industry due to the good combination of high corrosion resistance and excellent mechanical properties. ... -
EBSD Microstructure Characterization of 9% Nickel Steel during In Situ Heat Treatment
Jahrsengene, Gøril (Master thesis, 2015)The austenite content in 9% Ni steel was investigated with EBSD during and after in situ heating to different temperatures in the two phase region of the phase diagram, after first obtaining a coarse grained HAZ using weld ... -
EBSD Quantification of Retained Austenite in 9% Ni Steel Related to Thermal Treatments
Jahrsengene, Gøril; Wenn, Maia; Karlsen, Morten; Westermann, Ida; Akselsen, Odd Magne; Hjelen, Jarle (Chapter, 2015)The present work has been to study the effect of different finalizing preparation techniques on the amount of retained austenite measured with Electron Backscatter Diffraction (EBSD) and X-Ray-Diffraction (XRD) analysis. ... -
Effect of microstructure on the corrosion resistance of duplex stainless steels: Materials performance maps
Bernås, Mia; Westermann, Ida; Johnsen, Roy; Lauritsen, Christian; Iannuzzi, Mariano (Journal article; Peer reviewed, 2017)Although super duplex stainless steels (25Cr SDSS) are extensively used in oil and gas production due to their excellent combination of mechanical properties and corrosion resistance they are susceptible to the precipitation ... -
Effect of preheating and preplaced filler wire on microstructure and toughness in laser-arc hybrid welding of thick steel
Bunaziv, Ivan; Langelandsvik, Geir; Ren, Xiaobo; Westermann, Ida; Rørvik, Gisle; Dørum, Cato; Danielsen, Morten Høgseth; Eriksson, Magnus Carl Fredrik (Peer reviewed; Journal article, 2022)Acicular ferrite (AF) is the most important microstructural constituent to achieve high toughness at low temperatures in weld metal of steels. This is due to the relatively small grain size and large misorientation angles. ...