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Coupled hydrogen and phosphorous induced initiation of internal cracks in a large 18MnNiMo5 component

Abstract : This study analyzed a crack in a scrapped 18MnNiMo5 80-tonne shell. The root cause of crack formation was the low fracture toughness caused by a combination of a high hydrogen content and phosphorous segregation, caused by an inappropriate heat treatment. Cracking initiated on MnS inclusion clusters enabled by hydrogen desorption at the MnS/matrix interfaces. Crack propagation was due to the internal hydrogen pressure causing the crack tip stress intensity factor to exceed the locally-reduced fracture toughness. This new hydrogen induced cracking (HIC) mechanism can be designated as Hydrogen Induced Localised Damage (HILD). Appropriate process controls can eliminate such defects.
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https://hal-emse.ccsd.cnrs.fr/emse-02888075
Contributor : Géraldine Fournier-Moulin <>
Submitted on : Thursday, July 2, 2020 - 4:59:30 PM
Last modification on : Wednesday, August 5, 2020 - 3:46:41 AM

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Jean-Gabriel Sezgin, Cédric Bosch, Aurore Montouchet, Gilles Perrin, Andrej Atrens, et al.. Coupled hydrogen and phosphorous induced initiation of internal cracks in a large 18MnNiMo5 component. Engineering Failure Analysis, Elsevier, 2019, 104, pp.422-438. ⟨10.1016/j.engfailanal.2019.06.014⟩. ⟨emse-02888075⟩

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