Blar i Institutt for maskinteknikk og produksjon på forfatter "Barnoush, Afrooz"
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Evaluation of microstructural and environmental effects on the hydrogen uptake and desorption in high-strength carbon steels: A thermal desorption spectroscopy study
Karimi, Shabnam; Taji, Iman; Palencsar, Simona; Dugstad, Arne; Hajilou, Tarlan; Barnoush, Afrooz; Verbeken, Kim; Johnsen, Roy; Depover, Tom (Peer reviewed; Journal article, 2023)The hydrogen uptake in three high-strength carbon steels is studied after exposure to three different environments: an aqueous solution with CO2 bubbling, CO2/H2S bubbling, and cathodic charging without external gassing. ... -
Failure Analysis of Diffusor System for Gas Turbines
Seljevold, Cato (Master thesis, 2019)For å redusere lydnivået, forårsaket av et bleed air system i eksoskanalene til gassturbiner installert på olje- og gassplattformer, har Mjørud AS utviklet en diffusor. Denne diffusoren ble designet for å redusere hastigheten ... -
Failure Analysis of Diffusor System for Gas Turbines
Seljevold, Cato (Master thesis, 2019)For å redusere lydnivået, forårsaket av et bleed air system i eksoskanalene til gassturbiner installert på olje- og gassplattformer, har Mjørud AS utviklet en diffusor. Denne diffusoren ble designet for å redusere hastigheten ... -
Hydrogen assisted crack growth in iron: a simulations approach
Meling, Jan Inge Hammer (Doctoral theses at NTNU;2021:32, Doctoral thesis, 2021)Hydrogen enhances crack growth, limiting the lifetime of industrial components. Despite the abundance of research into hydrogen enhanced crack growth and its proposed mechanisms, none of the models can explain all the ... -
Hydrogen embrittlement effect observed by in-situ hydrogen plasma charging on a ferritic alloy
Wan, Di; Deng, Yun; Barnoush, Afrooz (Journal article; Peer reviewed, 2018)To study the hydrogen embrittlement (HE) effect, a novel in-situ slow strain rate tensile test together with in-situ hydrogen (H) charging by H-plasma was conducted in an environmental scanning electron microscope (ESEM). ... -
Hydrogen Embrittlement in Fe3%Si, Visited by Nanomechanical Testing and Cohesive Zone Simulation
Olden, Vigdis; Hajilou, Tarlan; Kheradmand, Nousha; Barnoush, Afrooz; Alvaro, Antonio; Osen, Vidar (Chapter, 2016)This work is part of a multi scale computational and experimental approach in which first principle modelling, nanoscale experiments and continuum simulations are combined in order to represent hydrogen induced degradation ... -
Hydrogen embrittlement revealed via novel in situ fracture experiments using notched micro-cantilever specimens
Deng, Yun; Barnoush, Afrooz (Journal article, 2018)The susceptibility of the FeAl intermetallic alloy to hydrogen-assisted cracking was investigated by in situ fracture experiments using notched micrometre-sized specimens using an Environmental Scanning Electron Microscope ... -
Hydrogen Enhanced Fatigue Crack Growth Rates in a Ferritic Fe-3wt%Si Alloy
Alvaro, Antonio; Wan, Di; Olden, Vigdis; Barnoush, Afrooz (Journal article; Peer reviewed, 2018)It is well known that the presence of hydrogen in ferrous materials promotes both static fracture and affect the material fatigue crack growth rates. The latter is often referred to as Hydrogen Enhanced Fatigue Crack Growth ... -
Hydrogen enhanced fatigue crack growth rates in a ferritic Fe-3 wt%Si alloy and a X70 pipeline steel
Alvaro, Antonio; Wan, Di; Olden, Vigdis; Barnoush, Afrooz (Journal article; Peer reviewed, 2019)It is well known that ferrous materials can be damaged by absorption of hydrogen. If a sufficient quantity of hydrogen penetrates into the material, static fracture and the material's fatigue performances can be affected ... -
Hydrogen Induced Stress Cracking of Inconel 718 under Cathodic Polarization - Effects of Hydrogen on the Initiation and Propagation of Cracks
Knarbakk, Kristian (Master thesis, 2015)This work has examined the susceptibility to hydrogen induced stress cracking (HISC) of Inconel 718 (UNS N07718) by stepwise tensile loading tests with in situ cathodic polarization. Specifically, the effect of hydrogen ... -
Hydrogen susceptibility of an interstitial equimolar high-entropy alloy revealed by in-situ electrochemical microcantilever bending test
Lu, Xu; Wang, Dong; Zhiming, Li; Deng, Yun; Barnoush, Afrooz (Peer reviewed; Journal article, 2019)Hydrogen effect on an interstitial CoCrFeMnNi high-entropy alloy was investigated by micro-cantilever bending tests with pre-notched plane as a case study. Results showed sharp mode I cracks on plane bisecting two planes ... -
Hydrogen-Assisted Cracking Investigated by In Situ Electrochemical Micro-Cantilever Bending Test
Hajilou, Tarlan (Doctoral theses at NTNU;2018:212, Doctoral thesis, 2018)Most high strength and high performance alloys experience a premature rupture and loss in the ductility when exposed to hydrogen. The interaction of hydrogen with dislocations and other microstructural defects such as ... -
Hydrogen-Assisted Fatigue Crack Growth in Ferritic Steels
Wan, Di (Doctoral theses at NTNU;2019:251, Doctoral thesis, 2019) -
Hydrogen-assisted fatigue crack growth in ferritic steels – a fractographic study
Wan, Di; Alvaro, Antonio; Olden, Vigdis; Barnoush, Afrooz (Journal article; Peer reviewed, 2018)Fatigue crack growth (FCG) behavior of a Fe-3wt.%Si ferritic alloy under different environmental conditions using in-situ electrochemical (cathodic) hydrogen (H) charging has been investigated. Three frequencies have been ... -
Hydrogen-enhanced cracking revealed by in situ micro-cantilever bending test inside environmental scanning electron microscope
Deng, Yun; Hajilou, Tarlan; Barnoush, Afrooz (Journal article, 2017)To evaluate the hydrogen (H)-induced embrittlement in iron aluminium intermetallics, especially the one with stoichiometric composition of 50 at.% Al, a novel in situ micro-cantilever bending test was applied within an ... -
Hydrogen-enhanced fatigue crack growth in a single-edge notched tensile specimen under in-situ hydrogen charging inside an environmental scanning electron microscope
Wan, Di; Deng, Yun; Meling, Jan Inge Hammer; Alvaro, Antonio; Barnoush, Afrooz (Journal article; Peer reviewed, 2019)Fatigue crack growth (FCG) test was done on a pre-cracked single-edge notched tensile (SENT) specimen with oligocrystalline ferritic structure. Innovative in-situ hydrogen (H)- charging by plasma inside an environmental ... -
Hydrogen-enhanced intergranular failure of sulfur-doped nickel grain boundary: In situ electrochemical micro-cantilever bending vs. DFT
Hajilou, Tarlan; Taji, Iman; Christien, Frédéric; He, Shuang; Scheiber, Daniel; Werner, Ecker; Reinhard, Pippan; Razumovskiy, Vsevolod I; Barnoush, Afrooz (Peer reviewed; Journal article, 2020)Intergranular failure of nickel (Ni) single grain boundaries (GBs) owing to the segregation of sulfur (S), hydrogen (H), and their co-segregation has been investigated by employing micro-cantilever bending tests and density ... -
In situ micromechanical testing in environmental scanning electron microscope: A new insight into hydrogen-assisted cracking
Rogne, Bjørn Rune; Kheradmand, Nousha; Deng, Yun; Barnoush, Afrooz (Journal article; Peer reviewed, 2018)The susceptibility of Fe–26Al–0.5Cr (at.%) intermetallic alloy to hydrogen assisted cracking was evaluated by micromechanical fracture mechanics specimens. The notched micro-beams were loaded in situ in an environmental ... -
In Situ Nanomechanical Testing of Electrochemical Hydrogen Permeation Membranes - A critical approach to study hydrogen embrittlement
Haga, Marte Waage (Master thesis, 2017)The purpose of this thesis is to determine if the new novel approach of investigating the effects of hydrogen, using a custom made hydrogen permeation cell together with a nanoindenter can give insight into the fundamental ... -
In situ small-scale hydrogen embrittlement testing made easy: An electrolyte for preserving surface integrity at nano-scale during hydrogen charging
Hajilou, Tarlan; Hope, Malin S.B.; Hossein Zavieh, Amin; Kheradmand, Nousha; Johnsen, Roy; Barnoush, Afrooz (Journal article; Peer reviewed, 2018)An electrolyte for electrochemical hydrogen charging of corrosion-susceptible alloys is developed, which preserves the surface integrity at nano-scale by minimizing the surface roughness alternation. To assure the formation ...