Coupled hydrogen and phosphorous induced initiation of internal cracks in a large 18MnNiMo5 component - Mines Saint-Étienne Access content directly
Journal Articles Engineering Failure Analysis Year : 2019

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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emse-02888075 , version 1 (31-08-2021)

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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, 2019, 104, pp.422-438. ⟨10.1016/j.engfailanal.2019.06.014⟩. ⟨emse-02888075⟩
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