Hydrogen-assisted fatigue crack propagation in a pure BCC iron. Part I: Intergranular crack propagation at relatively low stress intensities

Hydrogen-assisted fatigue crack propagation in a pure BCC iron. Part I: Intergranular crack propagation at relatively low stress intensities

The role of hydrogen on intergranular (IG) fracture in hydrogen-assisted fatigue crack growth (HAFCG) of a pure iron at low stress intensity was discussed in terms of the microscopic deformation structures near crack propagation paths. The main cause of IG fracture was assumed to be the hydrogen-enh...

Full description

Bibliographic Details
Main Authors: Ogawa Yuhei, Birenis Domas, Matsunaga Hisao, Takakuwa Osamu, Yamabe Junichiro, Prytz Øystein, Thøgersen Annett
Format: Article
Language:English
Published: EDP Sciences 2018-01-01
Series:MATEC Web of Conferences
Online Access:https://doi.org/10.1051/matecconf/201816503011
id doaj-c8429f18ebe34176b5e6ddb311a60670
record_format Article
spelling doaj-c8429f18ebe34176b5e6ddb311a606702021-02-02T07:05:43ZengEDP SciencesMATEC Web of Conferences2261-236X2018-01-011650301110.1051/matecconf/201816503011matecconf_fatigue2018_03011Hydrogen-assisted fatigue crack propagation in a pure BCC iron. Part I: Intergranular crack propagation at relatively low stress intensitiesOgawa YuheiBirenis DomasMatsunaga HisaoTakakuwa OsamuYamabe JunichiroPrytz ØysteinThøgersen AnnettThe role of hydrogen on intergranular (IG) fracture in hydrogen-assisted fatigue crack growth (HAFCG) of a pure iron at low stress intensity was discussed in terms of the microscopic deformation structures near crack propagation paths. The main cause of IG fracture was assumed to be the hydrogen-enhanced dislocation structure evolution and subsequent microvoids formation along the grain boundaries. Additionally, the impact of such IG cracking on the macroscopic FCG rate was evaluated according to the dependency of IG fracture propensity on the hydrogen gas pressure. It was first demonstrated that the increased hydrogen pressure results in the larger area fraction of IG and corresponding faster FCG rate. Moreover, gaseous hydrogen environment also had a positive influence on the FCG rate due to the absence of oxygen and water vapor. The macroscopic crack propagation rate was controlled by the competition process of said positive and negative effects.https://doi.org/10.1051/matecconf/201816503011
collection DOAJ
language English
format Article
sources DOAJ
author Ogawa Yuhei
Birenis Domas
Matsunaga Hisao
Takakuwa Osamu
Yamabe Junichiro
Prytz Øystein
Thøgersen Annett
spellingShingle Ogawa Yuhei
Birenis Domas
Matsunaga Hisao
Takakuwa Osamu
Yamabe Junichiro
Prytz Øystein
Thøgersen Annett
Hydrogen-assisted fatigue crack propagation in a pure BCC iron. Part I: Intergranular crack propagation at relatively low stress intensities
MATEC Web of Conferences
author_facet Ogawa Yuhei
Birenis Domas
Matsunaga Hisao
Takakuwa Osamu
Yamabe Junichiro
Prytz Øystein
Thøgersen Annett
author_sort Ogawa Yuhei
title Hydrogen-assisted fatigue crack propagation in a pure BCC iron. Part I: Intergranular crack propagation at relatively low stress intensities
title_short Hydrogen-assisted fatigue crack propagation in a pure BCC iron. Part I: Intergranular crack propagation at relatively low stress intensities
title_full Hydrogen-assisted fatigue crack propagation in a pure BCC iron. Part I: Intergranular crack propagation at relatively low stress intensities
title_fullStr Hydrogen-assisted fatigue crack propagation in a pure BCC iron. Part I: Intergranular crack propagation at relatively low stress intensities
title_full_unstemmed Hydrogen-assisted fatigue crack propagation in a pure BCC iron. Part I: Intergranular crack propagation at relatively low stress intensities
title_sort hydrogen-assisted fatigue crack propagation in a pure bcc iron. part i: intergranular crack propagation at relatively low stress intensities
publisher EDP Sciences
series MATEC Web of Conferences
issn 2261-236X
publishDate 2018-01-01
description The role of hydrogen on intergranular (IG) fracture in hydrogen-assisted fatigue crack growth (HAFCG) of a pure iron at low stress intensity was discussed in terms of the microscopic deformation structures near crack propagation paths. The main cause of IG fracture was assumed to be the hydrogen-enhanced dislocation structure evolution and subsequent microvoids formation along the grain boundaries. Additionally, the impact of such IG cracking on the macroscopic FCG rate was evaluated according to the dependency of IG fracture propensity on the hydrogen gas pressure. It was first demonstrated that the increased hydrogen pressure results in the larger area fraction of IG and corresponding faster FCG rate. Moreover, gaseous hydrogen environment also had a positive influence on the FCG rate due to the absence of oxygen and water vapor. The macroscopic crack propagation rate was controlled by the competition process of said positive and negative effects.
url https://doi.org/10.1051/matecconf/201816503011
work_keys_str_mv AT ogawayuhei hydrogenassistedfatiguecrackpropagationinapurebccironpartiintergranularcrackpropagationatrelativelylowstressintensities
AT birenisdomas hydrogenassistedfatiguecrackpropagationinapurebccironpartiintergranularcrackpropagationatrelativelylowstressintensities
AT matsunagahisao hydrogenassistedfatiguecrackpropagationinapurebccironpartiintergranularcrackpropagationatrelativelylowstressintensities
AT takakuwaosamu hydrogenassistedfatiguecrackpropagationinapurebccironpartiintergranularcrackpropagationatrelativelylowstressintensities
AT yamabejunichiro hydrogenassistedfatiguecrackpropagationinapurebccironpartiintergranularcrackpropagationatrelativelylowstressintensities
AT prytzøystein hydrogenassistedfatiguecrackpropagationinapurebccironpartiintergranularcrackpropagationatrelativelylowstressintensities
AT thøgersenannett hydrogenassistedfatiguecrackpropagationinapurebccironpartiintergranularcrackpropagationatrelativelylowstressintensities
_version_ 1724300046760935424

Similar Items