Results 11 to 20 of about 19,353 (291)

Metallurgical Model of Diffusible Hydrogen and Non-Metallic Slag Inclusions in Underwater Wet Welding of High-Strength Steel

open access: yesMetals, 2020
High susceptibility to cold cracking induced by diffusible hydrogen and hydrogen embrittlement are major obstacles to greater utilization of underwater wet welding for high-strength steels. The aim of the research was to develop gas–slag systems for flux-
Sergey G. Parshin   +2 more
doaj   +3 more sources

Hardening effect of diffusible hydrogen on BCC Fe-based model alloys by in situ backside hydrogen charging

open access: yesMaterials & Design, 2023
Hydrogen embrittlement is common in metallic materials and a critical issue in industries involving hydrogen-related processes. Here we investigate the mechanical response upon hydrogen loading of ferritic Fe-16Cr, Fe-21Cr and Fe-4Al alloys.
Jing Rao   +3 more
doaj   +3 more sources

Diffusible hydrogen behavior and delayed fracture of cold rolled martensitic steel in consideration of automotive manufacturing process and vehicle service environment

open access: yesJournal of Materials Research and Technology, 2020
This study aims to elucidate the behavior of diffusible hydrogen and delayed fracture in martensitic steel with 1500 MPa strength during automotive painting process and under vehicle service conditions.
Hye-Jin Kim   +6 more
doaj   +3 more sources

Evaluation of delayed fracture property and fractography of notched specimens for high tensile strength steel

open access: yesNihon Kikai Gakkai ronbunshu, 2021
The evaluation of delayed fracture is essential owing to the widespread application of high-strength steel to reduce automotive weight. Furthermore, it is necessary to clarify the influence of local stress concentration at the notch root as delayed ...
Aya TSUJI   +3 more
doaj   +1 more source

The role of hydrogen in the corrosion-induced reduction of KR critical fracture toughness and intergranular secondary cracking in a high-strength aluminium alloy [PDF]

open access: yesMATEC Web of Conferences, 2023
It is shown that short-term exposure of AA2024-T3 material to an exfoliation corrosion (EXCO) solution leads to a reduction of non-plane strain fracture toughness and the formation of secondary surface cracks during plastic straining.
Pretorius Christiaan, Mostert Roelf
doaj   +1 more source

In-situ observations of melt degassing and hydrogen removal enhanced by ultrasonics in underwater wet welding

open access: yesMaterials & Design, 2020
In this study, the phenomenon of gas removal behaviors in the melt pool and the flow behaviors of melt pool were observed using an in-situ X-ray imaging method.
Hao Chen   +5 more
doaj   +1 more source

Prediction of hydrogen cracking in the wet welding of structural steels with ferritic stick electrodes down to 20 m

open access: yesJournal of Materials Research and Technology, 2021
Hydrogen cracking (cold cracking), both in the heat-affected zone (HAZ) and in weld metal (WM) is one of the main factors responsible for losses in ductility and toughness in wet welds.
V.R. Santos   +8 more
doaj   +1 more source

Effect of the water depth on the hydrogen content in SMAW wet welded joints

open access: yesSN Applied Sciences, 2020
Hydrogen-induced cold cracking is a huge challenge in underwater wet welding. In the present study, the influence of water depth on the diffusible and residually stored hydrogen content is investigated for the case of underwater wet shielded metal arc ...
Jan Klett   +5 more
doaj   +1 more source

The impact of hydrogen on the ductility loss of bainitic Fe–C alloys [PDF]

open access: yes, 2016
The influence of hydrogen on the mechanical properties of generic lab-cast Fe-C bainitic alloys is studied by tensile tests on notched samples. The bainitic microstructure is induced in a 0.2% C and 0.4% C Fe-C alloy by an appropriate heat treatment. The
Depover, Tom   +2 more
core   +1 more source

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