Macro- and microscale investigations of hydrogen embrittlement in X70 pipeline steel by in-situ and ex-situ hydrogen charging tensile tests and in-situ electrochemical micro-cantilever bending test

2020 ◽  
Vol 772 ◽  
pp. 138762 ◽  
Author(s):  
M. Asadipoor ◽  
A. Pourkamali Anaraki ◽  
J. Kadkhodapour ◽  
S.M.H. Sharifi ◽  
A. Barnoush
Keyword(s):  
Hydrogen Embrittlement ◽  
Pipeline Steel ◽  
Tensile Tests ◽  
Ex Situ ◽  
Bending Test ◽  
X70 Pipeline Steel ◽  
Hydrogen Charging ◽  
Micro Cantilever ◽  
Cantilever Bending

scholarly journals Hydrogen-enhanced cracking revealed by in situ micro-cantilever bending test inside environmental scanning electron microscope

2017 ◽  
Vol 375 (2098) ◽  
pp. 20170106 ◽  
Author(s):  
Yun Deng ◽  
Tarlan Hajilou ◽  
Afrooz Barnoush
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Ion Beam ◽  
Environmental Scanning Electron Microscope ◽  
Bending Test ◽  
Environmental Scanning ◽  
Micro Cantilever ◽  
Cantilever Bending ◽  
Scanning Electron

To evaluate the hydrogen (H)-induced embrittlement in iron aluminium intermetallics, especially the one with stoichiometric composition of 50 at.% Al, a novel in situ micro-cantilever bending test was applied within an environmental scanning electron microscope (ESEM), which provides both a full process monitoring and a clean, in situ H-charging condition. Two sets of cantilevers were analysed in this work: one set of un-notched cantilevers, and the other set with focused ion beam-milled notch laying on two crystallographic planes: (010) and (110). The cantilevers were tested under two environmental conditions: vacuum (approximately 5 × 10 −4  Pa) and ESEM (450 Pa water vapour). Crack initiation at stress-concentrated locations and propagation to cause catastrophic failure were observed when cantilevers were tested in the presence of H; while no cracking occurred when tested in vacuum. Both the bending strength for un-notched beams and the fracture toughness for notched beams were reduced under H exposure. The hydrogen embrittlement (HE) susceptibility was found to be orientation dependent: the (010) crystallographic plane was more fragile to HE than the (110) plane. This article is part of the themed issue ‘The challenges of hydrogen and metals’.

scholarly journals Hydrogen-Assisted Crack Growth in the Heat-Affected Zone of X80 Steels during in Situ Hydrogen Charging

Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2575 ◽  
Author(s):  
Qu ◽  
Feng ◽  
An ◽  
Bi ◽  
Du ◽  
...  
Keyword(s):  
Hydrogen Embrittlement ◽  
Base Metal ◽  
Current Density ◽  
Heat Affected Zone ◽  
Tensile Tests ◽  
Electron Back Scatter Diffraction ◽  
Propagation Path ◽  
Hydrogen Charging ◽  
X80 Steels

Herein, the hydrogen embrittlement of a heat-affected zone (HAZ) was examined using slow strain rate tension in situ hydrogen charging. The influence of hydrogen on the crack path of the HAZ sample surfaces was determined using electron back scatter diffraction analysis. The hydrogen embrittlement susceptibility of the base metal and the HAZ samples increased with increasing current density. The HAZ samples have lower resistance to hydrogen embrittlement than the base metal samples in the same current density. Brittle circumferential cracks located at the HAZ sample surfaces were perpendicular to the loading direction, and the crack propagation path indicated that five or more cracks may join together to form a longer crack. The fracture morphologies were found to be a mixture of intergranular and transgranular fractures. Hydrogen blisters were observed on the HAZ sample surfaces after conducting tensile tests at a current density of 40 mA/cm2, leading to a fracture in the elastic deformation stage.

Hydrogen embrittlement susceptibility of X70 pipeline steel weld under a low partial hydrogen environment

2020 ◽  
Vol 45 (43) ◽  
pp. 23739-23753 ◽  
Author(s):  
Thanh Tuan Nguyen ◽  
Naehyung Tak ◽  
Jaeyeong Park ◽  
Seung Hoon Nahm ◽  
Un Bong Beak
Keyword(s):  
Hydrogen Embrittlement ◽  
Pipeline Steel ◽  
Steel Weld ◽  
X70 Pipeline Steel ◽  
Hydrogen Environment

scholarly journals Hydrogen Embrittlement Behavior of 18Ni 300 Maraging Steel Produced by Selective Laser Melting

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2360 ◽  
Author(s):  
Young Jin Kwon ◽  
Riccardo Casati ◽  
Mauro Coduri ◽  
Maurizio Vedani ◽  
Chong Soo Lee
Keyword(s):  
Hydrogen Embrittlement ◽  
Maraging Steel ◽  
Selective Laser Melting ◽  
Solution Treatment ◽  
Tensile Tests ◽  
Constant Current ◽  
Hydrogen Atoms ◽  
Laser Melting ◽  
Constant Current Density ◽  
Hydrogen Charging

A study was performed to investigate the hydrogen embrittlement behavior of 18-Ni 300 maraging steel produced by selective laser melting and subjected to different heat treatment strategies. Hydrogen was pre-charged into the tensile samples by an electro-chemical method at the constant current density of 1 A m−2 and 50 A m−2 for 48 h at room temperature. Charged and uncharged specimens were subjected to tensile tests and the hydrogen concentration was eventually analysed using quadrupole mass spectroscopy. After tensile tests, uncharged maraging samples showed fracture surfaces with dimples. Conversely, in H-charged alloys, quasi-cleavage mode fractures occurred. A lower concentration of trapped hydrogen atoms and higher elongation at fracture were measured in the H-charged samples that were subjected to solution treatment prior to hydrogen charging, compared to the as-built counterparts. Isothermal aging treatment performed at 460 °C for 8 h before hydrogen charging increased the concentration of trapped hydrogen, giving rise to higher hydrogen embrittlement susceptibility.

Effect of electrochemical hydrogen charging on an API X70 pipeline steel with focus on characterization of inclusions

2019 ◽  
Vol 173 ◽  
pp. 147-155 ◽  
Author(s):  
K.M. Mostafijur Rahman ◽  
M.A. Mohtadi-Bonab ◽  
Ryan Ouellet ◽  
Jerzy Szpunar ◽  
Ning Zhu
Keyword(s):  
Pipeline Steel ◽  
X70 Pipeline Steel ◽  
Hydrogen Charging

Hydrogen Embrittlement of PH 13-8 Mo Stainless Steel—The Effect of Surface Condition

CORROSION ◽  
1984 ◽  
Vol 40 (4) ◽  
pp. 146-151 ◽  
Author(s):  
G. T. Murray ◽  
H. H. Honegger ◽  
T. Mousel
Keyword(s):  
Stainless Steel ◽  
Hydrogen Embrittlement ◽  
Precipitation Hardening ◽  
Surface Condition ◽  
Tensile Tests ◽  
Time To Failure ◽  
Hydrogen Charging ◽  
Charging Time ◽  
Cold Worked ◽  
Effect Of Surface

Abstract The susceptibility of precipitation hardening 13-8 Mo stainless steel to hydrogen embrittlement (HE) was measured by both post hydrogen charging tensile tests and by time to failure tests while being subjected to hydrogen charging and a static stress below the yield stress. In the former, it was found that the ductility was decreased substantially after only 30 min charging time. The strength was markedly reduced after 2 h charging time. In the delayed failure tests, it was found that a localized cold worked surface condition promoted crack formation.

Hydrogen-enhanced intergranular failure of sulfur-doped nickel grain boundary: In situ electrochemical micro-cantilever bending vs. DFT

2020 ◽  
Vol 794 ◽  
pp. 139967 ◽  
Author(s):  
Tarlan Hajilou ◽  
Iman Taji ◽  
Frederic Christien ◽  
Shuang He ◽  
Daniel Scheiber ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Intergranular Failure ◽  
Micro Cantilever ◽  
Cantilever Bending
Sign in / Sign up

Export Citation Format

Share Document