Browsing NTNU Open by Author "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)

This thesis demonstrates a comprehensive study on the interaction between hydrogen and plasticity by using in-situ fine scale testing methods. It contains small-scale tensile tests with in-situ SEM observation as well as ...

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), ...

The effect of hydrogen on the crack initiation site of TRIP-assisted steels during in-situ hydrogen plasma micro-tensile testing: Leading to an improved ductility?

Depover, Tom; Wan, Di; Wang, Dong; Barnoush, Afrooz; Verbeken, Kim (Peer reviewed; Journal article, 2020)

The hydrogen induced damage and crack initiation in transformation induced plasticity (TRIP) steel is considered in the present work by micro tensile testing and subsequent microstructural assessment. Hydrogen characteristics ...

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, ...