Hydrogen assisted intergranular cracking of alloy 725: The effect of boron and copper alloying

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Hydrogen assisted intergranular cracking of alloy 725: The effect of boron and copper alloying. / Taji, Iman; Hajilou, Tarlan; Ebner, Anna et al.
In: Corrosion science, Vol. 203.2022, No. 15 July, 110331, 25.04.2020.

Research output: Contribution to journalArticleResearchpeer-review

Harvard

Taji, I, Hajilou, T, Ebner, A, Scheiber, D, Karimi, S, Plesiutschnig, E, Ecker, W, Barnoush, A, Maier-Kiener, V, Johnsen, R & Razumovskiy, VI 2020, 'Hydrogen assisted intergranular cracking of alloy 725: The effect of boron and copper alloying', Corrosion science, vol. 203.2022, no. 15 July, 110331. https://doi.org/10.1016/j.corsci.2022.110331

APA

Taji, I., Hajilou, T., Ebner, A., Scheiber, D., Karimi, S., Plesiutschnig, E., Ecker, W., Barnoush, A., Maier-Kiener, V., Johnsen, R., & Razumovskiy, V. I. (2020). Hydrogen assisted intergranular cracking of alloy 725: The effect of boron and copper alloying. Corrosion science, 203.2022(15 July), Article 110331. https://doi.org/10.1016/j.corsci.2022.110331

Vancouver

Taji I, Hajilou T, Ebner A, Scheiber D, Karimi S, Plesiutschnig E et al. Hydrogen assisted intergranular cracking of alloy 725: The effect of boron and copper alloying. Corrosion science. 2020 Apr 25;203.2022(15 July):110331. doi: 10.1016/j.corsci.2022.110331

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@article{c7abe129dcb543e18348045759b047d2,
title = "Hydrogen assisted intergranular cracking of alloy 725: The effect of boron and copper alloying",
abstract = "To overcome the Hydrogen embrittlement (HE) susceptibility of the standard Alloy 725 (Mod A), two alloys with minor alloying modifications with B (Mod B) and B+Cu (Mod C) were produced. Then, the intergranular cracking susceptibility was investigated on bi-crystal beams by electrochemical in situ micro-cantilever bending test. The atom probe tomography and first principles calculations were employed to capture and calculate the grain boundary (GB) segregation and its effect on the GB cohesion. Cross-sectional view of the bent beams showed the superior resistance of Mod B against HE by facilitating the GB dislocation transfer/generation. While bending Mod A sample in hydrogen environment leads to form a sharp intergranular cracking, Mod B showed some nano-voids/cracks mostly in dislocation slip bands and rarely in GB path. However, a reduction of strength was observed in load-displacement (L-D) curves of Mod B. The addition of Cu, although not participated in GB segregation, compromised the lost strength of Mod B. In Mod C, after bending in H-charged condition, the nano-voids were formed in GB, but no load drop in L-D curves nor crack propagation in post-deformation observations was detected. The micro-alloying proposed in this study could be an important contribution to the future developing of H resistant alloys via GB segregation engineering.",
author = "Iman Taji and Tarlan Hajilou and Anna Ebner and Daniel Scheiber and Shabnam Karimi and Ernst Plesiutschnig and Werner Ecker and Afrooz Barnoush and Verena Maier-Kiener and Roy Johnsen and V.I. Razumovskiy",
year = "2020",
month = apr,
day = "25",
doi = "10.1016/j.corsci.2022.110331",
language = "English",
volume = "203.2022",
journal = "Corrosion science",
issn = "0010-938X",
publisher = "Elsevier",
number = "15 July",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Hydrogen assisted intergranular cracking of alloy 725

T2 - The effect of boron and copper alloying

AU - Taji, Iman

AU - Hajilou, Tarlan

AU - Ebner, Anna

AU - Scheiber, Daniel

AU - Karimi, Shabnam

AU - Plesiutschnig, Ernst

AU - Ecker, Werner

AU - Barnoush, Afrooz

AU - Maier-Kiener, Verena

AU - Johnsen, Roy

AU - Razumovskiy, V.I.

PY - 2020/4/25

Y1 - 2020/4/25

N2 - To overcome the Hydrogen embrittlement (HE) susceptibility of the standard Alloy 725 (Mod A), two alloys with minor alloying modifications with B (Mod B) and B+Cu (Mod C) were produced. Then, the intergranular cracking susceptibility was investigated on bi-crystal beams by electrochemical in situ micro-cantilever bending test. The atom probe tomography and first principles calculations were employed to capture and calculate the grain boundary (GB) segregation and its effect on the GB cohesion. Cross-sectional view of the bent beams showed the superior resistance of Mod B against HE by facilitating the GB dislocation transfer/generation. While bending Mod A sample in hydrogen environment leads to form a sharp intergranular cracking, Mod B showed some nano-voids/cracks mostly in dislocation slip bands and rarely in GB path. However, a reduction of strength was observed in load-displacement (L-D) curves of Mod B. The addition of Cu, although not participated in GB segregation, compromised the lost strength of Mod B. In Mod C, after bending in H-charged condition, the nano-voids were formed in GB, but no load drop in L-D curves nor crack propagation in post-deformation observations was detected. The micro-alloying proposed in this study could be an important contribution to the future developing of H resistant alloys via GB segregation engineering.

AB - To overcome the Hydrogen embrittlement (HE) susceptibility of the standard Alloy 725 (Mod A), two alloys with minor alloying modifications with B (Mod B) and B+Cu (Mod C) were produced. Then, the intergranular cracking susceptibility was investigated on bi-crystal beams by electrochemical in situ micro-cantilever bending test. The atom probe tomography and first principles calculations were employed to capture and calculate the grain boundary (GB) segregation and its effect on the GB cohesion. Cross-sectional view of the bent beams showed the superior resistance of Mod B against HE by facilitating the GB dislocation transfer/generation. While bending Mod A sample in hydrogen environment leads to form a sharp intergranular cracking, Mod B showed some nano-voids/cracks mostly in dislocation slip bands and rarely in GB path. However, a reduction of strength was observed in load-displacement (L-D) curves of Mod B. The addition of Cu, although not participated in GB segregation, compromised the lost strength of Mod B. In Mod C, after bending in H-charged condition, the nano-voids were formed in GB, but no load drop in L-D curves nor crack propagation in post-deformation observations was detected. The micro-alloying proposed in this study could be an important contribution to the future developing of H resistant alloys via GB segregation engineering.

U2 - 10.1016/j.corsci.2022.110331

DO - 10.1016/j.corsci.2022.110331

M3 - Article

VL - 203.2022

JO - Corrosion science

JF - Corrosion science

SN - 0010-938X

IS - 15 July

M1 - 110331

ER -