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Article

Investigation of Hydrogen Embrittlement Susceptibility and Fracture Toughness Drop after in situ Hydrogen Cathodic Charging for an X65 Pipeline Steel

1
Shipbuilding Technology Laboratory, School of Naval Architecture and Marine Engineering, National Technical University of Athens, 15780 Athens, Greece
2
School of Mechanical Engineering and Robotics, AGH University of Science and Technology, Mickiewicza 30, 30-059 Cracow, Poland
3
School of Mechanical Engineering, National Technical University of Athens, Heroon Polytechniou 9, 15780 Athens, Greece
4
Corinth Pipeworks S.A., Industrial Area of Voiotia, Thisvi, 32010 Domvraina, Greece
*
Author to whom correspondence should be addressed.
This author passed away.
Micromachines 2020, 11(4), 430; https://doi.org/10.3390/mi11040430
Received: 28 March 2020 / Revised: 15 April 2020 / Accepted: 18 April 2020 / Published: 20 April 2020
(This article belongs to the Special Issue Advanced Manufacturing Technology)
The present research focuses on the investigation of an in situ hydrogen charging effect during Crack Tip Opening Displacement testing (CTOD) on the fracture toughness properties of X65 pipeline steel. This grade of steel belongs to the broader category of High Strength Low Alloy Steels (HSLA), and its microstructure consists of equiaxed ferritic and bainitic grains with a low volume fraction of degenerated pearlite islands. The studied X65 steel specimens were extracted from pipes with 19.15 mm wall thickness. The fracture toughness parameters were determined after imposing the fatigue pre-cracked specimens on air, on a specific electrolytic cell under a slow strain rate bending loading (according to ASTM G147-98, BS7448, and ISO12135 standards). Concerning the results of this study, in the first phase the hydrogen cations’ penetration depth, the diffusion coefficient of molecular and atomic hydrogen, and the surficial density of blisters were determined. Next, the characteristic parameters related to fracture toughness (such as J, KQ, CTODel, CTODpl) were calculated by the aid of the Force-Crack Mouth Open Displacement curves and the relevant analytical equations. View Full-Text
Keywords: X65 pipeline steel; hydrogen embrittlement; in situ hydrogen cathodic charging; crack tip opening displacement test (CTOD); crack mouth open displacement (CMOD); fracture analysis X65 pipeline steel; hydrogen embrittlement; in situ hydrogen cathodic charging; crack tip opening displacement test (CTOD); crack mouth open displacement (CMOD); fracture analysis
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MDPI and ACS Style

Kyriakopoulou, H.P.; Karmiris-Obratański, P.; Tazedakis, A.S.; Daniolos, N.M.; Dourdounis, E.C.; Manolakos, D.E.; Pantelis, D. Investigation of Hydrogen Embrittlement Susceptibility and Fracture Toughness Drop after in situ Hydrogen Cathodic Charging for an X65 Pipeline Steel. Micromachines 2020, 11, 430. https://doi.org/10.3390/mi11040430

AMA Style

Kyriakopoulou HP, Karmiris-Obratański P, Tazedakis AS, Daniolos NM, Dourdounis EC, Manolakos DE, Pantelis D. Investigation of Hydrogen Embrittlement Susceptibility and Fracture Toughness Drop after in situ Hydrogen Cathodic Charging for an X65 Pipeline Steel. Micromachines. 2020; 11(4):430. https://doi.org/10.3390/mi11040430

Chicago/Turabian Style

Kyriakopoulou, Helen P., Panagiotis Karmiris-Obratański, Athanasios S. Tazedakis, Nikoalos M. Daniolos, Efthymios C. Dourdounis, Dimitrios E. Manolakos, and Dimitrios Pantelis. 2020. "Investigation of Hydrogen Embrittlement Susceptibility and Fracture Toughness Drop after in situ Hydrogen Cathodic Charging for an X65 Pipeline Steel" Micromachines 11, no. 4: 430. https://doi.org/10.3390/mi11040430

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