Hydrogen-assisted fatigue crack-propagation in a Ni-based superalloy 718, revealed via crack-path crystallography and deformation microstructures

Yuhei Ogawa; Osamu Takakuwa; Saburo Okazaki; Yusuke Funakoshi; Saburo Matsuoka; Hisao Matsunaga

doi:10.1016/j.corsci.2020.108814

Hydrogen-assisted fatigue crack-propagation in a Ni-based superalloy 718, revealed via crack-path crystallography and deformation microstructures

Yuhei Ogawa, Osamu Takakuwa, Saburo Okazaki, Yusuke Funakoshi, Saburo Matsuoka, Hisao Matsunaga

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

17 Citations (Scopus)

Abstract

Fatigue crack-growth (FCG) of Ni-based superalloy 718 was investigated under gaseous hydrogen environment (external hydrogen) and uniformly pre-charged state (internal hydrogen). Under external hydrogen, intergranular fracture predominated, whereas dislocation slip-band or twin boundary fracture were prevalent under internal hydrogen. This failure mode divergence encompassed unique characteristics of macroscale FCG response, leading to both cycle- and time-dependent cracking. The intergranular cracking was ascribed to short-circuit diffusion of hydrogen along grain boundaries. Meanwhile, the material's inherently inhomogeneous deformation mode exerts harmfulness when hydrogen was uniformly distributed inside the specimen, causing slip-bands or twin boundaries to become the weakest links for fracture.

Original language	English
Article number	108814
Journal	Corrosion Science
Volume	174
DOIs	https://doi.org/10.1016/j.corsci.2020.108814
Publication status	Published - Sept 2020

All Science Journal Classification (ASJC) codes

Chemistry(all)
Chemical Engineering(all)
Materials Science(all)

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10.1016/j.corsci.2020.108814

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title = "Hydrogen-assisted fatigue crack-propagation in a Ni-based superalloy 718, revealed via crack-path crystallography and deformation microstructures",

abstract = "Fatigue crack-growth (FCG) of Ni-based superalloy 718 was investigated under gaseous hydrogen environment (external hydrogen) and uniformly pre-charged state (internal hydrogen). Under external hydrogen, intergranular fracture predominated, whereas dislocation slip-band or twin boundary fracture were prevalent under internal hydrogen. This failure mode divergence encompassed unique characteristics of macroscale FCG response, leading to both cycle- and time-dependent cracking. The intergranular cracking was ascribed to short-circuit diffusion of hydrogen along grain boundaries. Meanwhile, the material's inherently inhomogeneous deformation mode exerts harmfulness when hydrogen was uniformly distributed inside the specimen, causing slip-bands or twin boundaries to become the weakest links for fracture.",

author = "Yuhei Ogawa and Osamu Takakuwa and Saburo Okazaki and Yusuke Funakoshi and Saburo Matsuoka and Hisao Matsunaga",

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AU - Ogawa, Yuhei

AU - Takakuwa, Osamu

AU - Okazaki, Saburo

AU - Funakoshi, Yusuke

AU - Matsuoka, Saburo

AU - Matsunaga, Hisao

N1 - Funding Information: This work was executed as part of a collaborative research project between the Japan Aerospace Exploration Agency (JAXA) and Kyushu University. Publisher Copyright: © 2020 Elsevier Ltd

PY - 2020/9

Y1 - 2020/9

N2 - Fatigue crack-growth (FCG) of Ni-based superalloy 718 was investigated under gaseous hydrogen environment (external hydrogen) and uniformly pre-charged state (internal hydrogen). Under external hydrogen, intergranular fracture predominated, whereas dislocation slip-band or twin boundary fracture were prevalent under internal hydrogen. This failure mode divergence encompassed unique characteristics of macroscale FCG response, leading to both cycle- and time-dependent cracking. The intergranular cracking was ascribed to short-circuit diffusion of hydrogen along grain boundaries. Meanwhile, the material's inherently inhomogeneous deformation mode exerts harmfulness when hydrogen was uniformly distributed inside the specimen, causing slip-bands or twin boundaries to become the weakest links for fracture.

AB - Fatigue crack-growth (FCG) of Ni-based superalloy 718 was investigated under gaseous hydrogen environment (external hydrogen) and uniformly pre-charged state (internal hydrogen). Under external hydrogen, intergranular fracture predominated, whereas dislocation slip-band or twin boundary fracture were prevalent under internal hydrogen. This failure mode divergence encompassed unique characteristics of macroscale FCG response, leading to both cycle- and time-dependent cracking. The intergranular cracking was ascribed to short-circuit diffusion of hydrogen along grain boundaries. Meanwhile, the material's inherently inhomogeneous deformation mode exerts harmfulness when hydrogen was uniformly distributed inside the specimen, causing slip-bands or twin boundaries to become the weakest links for fracture.

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Hydrogen-assisted fatigue crack-propagation in a Ni-based superalloy 718, revealed via crack-path crystallography and deformation microstructures

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