Blar i NTNU Open på forfatter "Barnoush, Afrooz"
-
Advanced small-scale characterization of hydrogen embrittlement
Fagerkind, Roar Andre (Master thesis, 2016)A large amount of micro-cantilevers were made using a focused ion beam (FIB) microscope. The cantilevers were made to be tested under cyclic loading in a triboindenter to determine the hydrogen effect on the grain boundaries ... -
Advanced small-scale characterization of hydrogen embrittlement in nickel and nickel alloys
Fossheim, Sondre (Master thesis, 2018)The demand for high strength materials is increasing in the modern industrial development. With more challenging applications and extreme environments, it is essential that materials are able to meet capacity and safety ... -
An Application Prototype for Hydrogen Permeation Data Analysis
Simonsen, Bendik Wendt (Master thesis, 2015)An application has been developed in order to analyze data results from experiments revolving adsorption and diffusion of hydrogen in X70 and Fe 3wt.% Si steel. The experiment was performed under cathodic charging conditions ... -
Assessment of the potential of hydrogen plasma charging as compared to conventional electrochemical hydrogen charging on dual phase steel.
Depover, Tom; Hajilou, Tarlan; Wan, Di; Wang, Dong; Barnoush, Afrooz; Verbeken, Kim (Journal article; Peer reviewed, 2019)The present study evaluates the hydrogen induced damage by in-situ hydrogen plasma charging in dual phase (DP) steel. Cold deformation of 15% is applied on the material to change microstructural defects, such as dislocation ... -
CO2 Adsorption and Activation on the (110) Chalcopyrite Surfaces: A Dispersion-Corrected DFT + U Study
Khaledialidusti, Rasoul; Kumar Mishra, Abhishek; Barnoush, Afrooz (Journal article; Peer reviewed, 2019)We have used the density functional theory within the plane-wave framework to understand the reconstruction of most stable (110) chalcopyrite surfaces. Reconstructions of the polar surfaces are proposed, and three different ... -
Connection Between Critical Stress and Hydrogen Content for SDSS under Cathodic Protection
Krosness, Ola Myklatun (Master thesis, 2014)In recent years Super Duplex Stainless Steel (SDSS) installed subsea with cathodic protection has failed during service. The failures have been due to Hydrogen Induced Stress Cracking (HISC). The effect from different ... -
Development of prototype versatile permeation cells for hydrogen diffusion measurements in ferritic steels
Thorsås, Jens Kristian (Master thesis, 2015)This thesis provides three different design solutions for hydrogen permeation cells based on Devanathan and Stachurski method for hydrogen charging. The first part of the thesis is built as a background analysis for the ... -
Effect of electrochemical charging on the hydrogen embrittlement susceptibility of Alloy 718
Lu, Xu; Wang, Dong; Wan, Di; Zhang, Zhenbo; Kheradmand, Nousha; Barnoush, Afrooz (Peer reviewed; Journal article, 2019)The susceptibility of age-hardened nickel-based Alloy 718 to hydrogen embrittlement was studied by the controlled electrochemical charging combined with slow strain-rate tensile tests (SSRT) and advanced characterization ... -
Effect of Hydrogen in Advanced High Strength Alloys Revisited via Small Scale- In-Situ Techniques
Wang, Dong (Doctoral theses at NTNU;2020:59, Doctoral thesis, 2020) -
Effect of hydrogen on dislocation nucleation in alloy 718
Stenerud, Gaute; Johnsen, Roy; Olsen, Jim Stian; He, Jianying; Barnoush, Afrooz (Journal article; Peer reviewed, 2017)In situ electrochemical nanoindentation has been used to study the effect of hydrogen on the nanomechanical response of Alloy 718. Observations show that hardness increase as a result of hydrogen charging. Also, the hydrogen ... -
Effect of hydrogen on nanomechanical properties in Fe-22Mn-0.6C TWIP steel revealed by in-situ electrochemical nanoindentation
Wang, Dong; Lu, Xu; Deng, Yun; Guo, Xiaofei; Barnoush, Afrooz (Journal article; Peer reviewed, 2018)In-situ electrochemical nanoindentation was applied to study the effect of hydrogen on the mechanical properties of Fe-22Mn-0.6C TWIP steel at nanoscale. Distinctive behaviors in three defined grain orientations: (001), ... -
Effect of hydrogen-induced surface steps on the nanomechanical behavior of a CoCrFeMnNi high-entropy alloy revealed by in-situ electrochemical nanoindentation
Wang, Dong; Lu, Xu; Deng, Yun; Wan, Di; Li, Zhiming; Barnoush, Afrooz (Peer reviewed; Journal article, 2019)The effect of hydrogen on the nanomechanical properties of CoCrFeMnNi high-entropy alloy was investigated by in-situ electrochemical nanoindentation testing. The changes in surface morphology, elastic modulus, pop-in load, ... -
Effect of nickel in solid solution on the hydrogen embrittlement resistance of low alloy steels
Husby, Hans (Doctoral theses at NTNU;2018:231, Doctoral thesis, 2018)The ever-increasing demand and consumption of energy in the world is depleting conventional oil and gas reserves. Nickel alloying improves mechanical and technological properties of low alloy steels (LAS), but is limited ... -
Effect of nickel on hydrogen permeation in ferritic/ pearlitic low alloy steels
Husby, Hans; Iannuzzi, Mariano; Johnsen, Roy; Mariano, Kappes; Barnoush, Afrooz (Journal article; Peer reviewed, 2018)Nickel offers several beneficial effects as an alloying element to low alloy steels. However, it is, in the oil and gas industry, limited by part 2 of the ISO 15156 standard to a maximum of 1 wt% due to sulfide stress ... -
Effect of Plastic Deformation and Microstructure on Hydrogen Diffusion in Steel
Hope, Malin Sofie Berglund (Master thesis, 2015)This work has been part of the ROP (Repair Contingency of Pipelines) project executed by SINTEF, where Vigdis Olden is project lead. The main content of this report is the execution of hydrogen permeation tests on Fe3wt.%Si ... -
Environmental Embrittlement Revisited by In-Situ Miniature Fracture Testing Approach
Deng, Yun (Doctoral theses at NTNU;2019:25, Doctoral thesis, 2019) -
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 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 ...