Effect of hydrogen on dislocation nucleation in alloy 718

Gaute Stenerud; Roy Johnsen; Jim Stian Olsen; Jianying He; Afrooz Barnoush

doi:10.1016/j.ijhydene.2017.04.290

Effect of hydrogen on dislocation nucleation in alloy 718

Gaute Stenerud, Roy Johnsen, Jim Stian Olsen, Jianying He, Afrooz Barnoush^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

40 Citations (Scopus)

Abstract

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 charging gives a reduced pop-in load and pop-in width. This is related to a reduction in the energy needed for dislocation nucleation and the mobility of the dislocations in the presence of hydrogen. Two grains with different orientations has been tested here. The pop-in load and width obtained in the (101) orientation was more affected by the presence of hydrogen than those achieved in the (111) oriented grain.

Original language	English
Pages (from-to)	15933-15942
Number of pages	10
Journal	International Journal of Hydrogen Energy
Volume	42
Issue number	24
DOIs	https://doi.org/10.1016/j.ijhydene.2017.04.290
Publication status	Published - 15 Jun 2017
Externally published	Yes

Keywords

Alloy 718
Dislocation nucleation
Electrochemical nanoindentation
Hardness
Hydrogen embrittlement

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10.1016/j.ijhydene.2017.04.290

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title = "Effect of hydrogen on dislocation nucleation in alloy 718",

abstract = "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 charging gives a reduced pop-in load and pop-in width. This is related to a reduction in the energy needed for dislocation nucleation and the mobility of the dislocations in the presence of hydrogen. Two grains with different orientations has been tested here. The pop-in load and width obtained in the (101) orientation was more affected by the presence of hydrogen than those achieved in the (111) oriented grain.",

keywords = "Alloy 718, Dislocation nucleation, Electrochemical nanoindentation, Hardness, Hydrogen embrittlement",

author = "Gaute Stenerud and Roy Johnsen and Olsen, {Jim Stian} and Jianying He and Afrooz Barnoush",

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AU - Stenerud, Gaute

AU - Johnsen, Roy

AU - Olsen, Jim Stian

AU - He, Jianying

AU - Barnoush, Afrooz

PY - 2017/6/15

Y1 - 2017/6/15

N2 - 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 charging gives a reduced pop-in load and pop-in width. This is related to a reduction in the energy needed for dislocation nucleation and the mobility of the dislocations in the presence of hydrogen. Two grains with different orientations has been tested here. The pop-in load and width obtained in the (101) orientation was more affected by the presence of hydrogen than those achieved in the (111) oriented grain.

AB - 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 charging gives a reduced pop-in load and pop-in width. This is related to a reduction in the energy needed for dislocation nucleation and the mobility of the dislocations in the presence of hydrogen. Two grains with different orientations has been tested here. The pop-in load and width obtained in the (101) orientation was more affected by the presence of hydrogen than those achieved in the (111) oriented grain.

KW - Alloy 718

KW - Dislocation nucleation

KW - Electrochemical nanoindentation

KW - Hardness

KW - Hydrogen embrittlement

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VL - 42

SP - 15933

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JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

IS - 24

ER -

Effect of hydrogen on dislocation nucleation in alloy 718

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