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Grain boundary carbides as hydrogen diffusion barrier in a Fe-Ni alloy: A thermal desorption and modelling study

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Grain boundary carbides as hydrogen diffusion barrier in a Fe-Ni alloy: A thermal desorption and modelling study. / Turk, A.; Bombač, D.; Jelita Rydel, J. et al.
In: Materials and Design, Vol. 160, 15.12.2018, p. 985-998.

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Turk A, Bombač D, Jelita Rydel J, Ziętara M, Rivera-Díaz-del-Castillo PEJ, Galindo-Nava EI. Grain boundary carbides as hydrogen diffusion barrier in a Fe-Ni alloy: A thermal desorption and modelling study. Materials and Design. 2018 Dec 15;160:985-998. doi: 10.1016/j.matdes.2018.10.012

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Turk, A. ; Bombač, D. ; Jelita Rydel, J. et al. / Grain boundary carbides as hydrogen diffusion barrier in a Fe-Ni alloy : A thermal desorption and modelling study. In: Materials and Design. 2018 ; Vol. 160. pp. 985-998.

Bibtex

@article{7b60a47a3d164489970a177495016a6e,
title = "Grain boundary carbides as hydrogen diffusion barrier in a Fe-Ni alloy: A thermal desorption and modelling study",
abstract = "A significant decrease in hydrogen absorption in the presence of grain boundary carbides compared to the carbide-free microstructure in the Ni-based HR6W alloy was measured by thermal desorption analysis (TDA). This novel observation is at odds with numerous existing reports – precipitate-rich microstructures generally absorb more hydrogen due to trapping effects. This discrepancy can only be explained by grain boundary diffusion which is known to be fast in Ni-based alloys. It is proposed that grain boundary diffusion is hindered by carbides, resulting in decreased hydrogen absorption. Further experimental evidence corroborates the hypothesis. In addition, a diffusion model was developed to quantify the experimental results, incorporating trapping, grain boundary diffusion and temperature effects. It was successfully applied to the reported TDA data as well as additional diffusion data from the literature. A parametric analysis showed that hydrogen absorption scales strongly with grain size and grain boundary diffusivity while grain boundary segregation energy has a much lower impact. The results of the study point at grain boundary precipitation as a possible means of hydrogen embrittlement mitigation in Ni alloys and austenitic stainless steels. {\textcopyright} 2018",
keywords = "Carbides, Grain boundary diffusion, Hydrogen diffusion, Thermal desorption analysis (TDA), Binary alloys, Diffusion barriers, Grain boundaries, Microstructure, Nickel alloys, Precipitation (chemical), Thermal desorption, Grain boundary carbides, Grain boundary diffusivity, Grain boundary precipitation, Grain boundary segregation, Grain-boundary diffusion, Hydrogen diffusion barriers, Thermal desorption analysis, Iron alloys",
author = "A. Turk and D. Bomba{\v c} and {Jelita Rydel}, J. and M. Zi{\c e}tara and Rivera-D{\'i}az-del-Castillo, {Pedro E. J.} and E.I. Galindo-Nava",
year = "2018",
month = dec,
day = "15",
doi = "10.1016/j.matdes.2018.10.012",
language = "English",
volume = "160",
pages = "985--998",
journal = "Materials and Design",
issn = "0264-1275",
publisher = "Elsevier Ltd",

}

RIS

TY - JOUR

T1 - Grain boundary carbides as hydrogen diffusion barrier in a Fe-Ni alloy

T2 - A thermal desorption and modelling study

AU - Turk, A.

AU - Bombač, D.

AU - Jelita Rydel, J.

AU - Ziętara, M.

AU - Rivera-Díaz-del-Castillo, Pedro E. J.

AU - Galindo-Nava, E.I.

PY - 2018/12/15

Y1 - 2018/12/15

N2 - A significant decrease in hydrogen absorption in the presence of grain boundary carbides compared to the carbide-free microstructure in the Ni-based HR6W alloy was measured by thermal desorption analysis (TDA). This novel observation is at odds with numerous existing reports – precipitate-rich microstructures generally absorb more hydrogen due to trapping effects. This discrepancy can only be explained by grain boundary diffusion which is known to be fast in Ni-based alloys. It is proposed that grain boundary diffusion is hindered by carbides, resulting in decreased hydrogen absorption. Further experimental evidence corroborates the hypothesis. In addition, a diffusion model was developed to quantify the experimental results, incorporating trapping, grain boundary diffusion and temperature effects. It was successfully applied to the reported TDA data as well as additional diffusion data from the literature. A parametric analysis showed that hydrogen absorption scales strongly with grain size and grain boundary diffusivity while grain boundary segregation energy has a much lower impact. The results of the study point at grain boundary precipitation as a possible means of hydrogen embrittlement mitigation in Ni alloys and austenitic stainless steels. © 2018

AB - A significant decrease in hydrogen absorption in the presence of grain boundary carbides compared to the carbide-free microstructure in the Ni-based HR6W alloy was measured by thermal desorption analysis (TDA). This novel observation is at odds with numerous existing reports – precipitate-rich microstructures generally absorb more hydrogen due to trapping effects. This discrepancy can only be explained by grain boundary diffusion which is known to be fast in Ni-based alloys. It is proposed that grain boundary diffusion is hindered by carbides, resulting in decreased hydrogen absorption. Further experimental evidence corroborates the hypothesis. In addition, a diffusion model was developed to quantify the experimental results, incorporating trapping, grain boundary diffusion and temperature effects. It was successfully applied to the reported TDA data as well as additional diffusion data from the literature. A parametric analysis showed that hydrogen absorption scales strongly with grain size and grain boundary diffusivity while grain boundary segregation energy has a much lower impact. The results of the study point at grain boundary precipitation as a possible means of hydrogen embrittlement mitigation in Ni alloys and austenitic stainless steels. © 2018

KW - Carbides

KW - Grain boundary diffusion

KW - Hydrogen diffusion

KW - Thermal desorption analysis (TDA)

KW - Binary alloys

KW - Diffusion barriers

KW - Grain boundaries

KW - Microstructure

KW - Nickel alloys

KW - Precipitation (chemical)

KW - Thermal desorption

KW - Grain boundary carbides

KW - Grain boundary diffusivity

KW - Grain boundary precipitation

KW - Grain boundary segregation

KW - Grain-boundary diffusion

KW - Hydrogen diffusion barriers

KW - Thermal desorption analysis

KW - Iron alloys

U2 - 10.1016/j.matdes.2018.10.012

DO - 10.1016/j.matdes.2018.10.012

M3 - Journal article

VL - 160

SP - 985

EP - 998

JO - Materials and Design

JF - Materials and Design

SN - 0264-1275

ER -