| Issue |
MATEC Web Conf.
Volume 188, 2018
5th International Conference of Engineering Against Failure (ICEAF-V 2018)
|
|
|---|---|---|
| Article Number | 04010 | |
| Number of page(s) | 8 | |
| Section | Design of Components and Engineering Elements, Coatings, Failure Analysis | |
| DOI | https://doi.org/10.1051/matecconf/201818804010 | |
| Published online | 07 August 2018 | |
Hydrogen Induced Crack Development in Submerged Arc Welded Steel Pipes
1
National Technical University of Athens, School of Mining & Metallurgical Engineering, Division of Metallurgy and Materials, Laboratory of Physical Metallurgy,
9, Her. Polytechniou str.,
Zografos,
GR-157 80,
Athens,
Hellas
2
ELKEME S.A.,
56th km Athens-Lamia Nat. Road,
32011
Oinofyta, Viotia,
Greece
* Corresponding author: mbouzouni@elkeme.vionet.gr
The current work examines hydrogen sensitivity in different pipeline steels (X65, X70 and X80 HSLA grades) from four productions. Hydrogen Induced Cracking (HIC) experiments were performed and then the welds were characterized via optical and scanning electron microscopy techniques. The optical micrographs revealed cracks only in one of the four welds. Transverse cracks were found along bainitic-ferrite/carbide islands within the heat affected zone and the base metal of production B. Found inclusions e.g. MnS inside the cracks acted as initiation points for the HIC. However, the weld zones in all productions consisting of acicular ferrite and grain boundary ferrite were found to be resistant in hydrogen embrittlement. Therefore, the presence of bainitic ferrite with carbides at the grain boundaries in the microstructures and the intense presence of MnS inclusions caused HIC in pipeline steel from production B. The manufacturing process, the forming and welding conditions in the examined case seem not to have negatively influenced the pipeline steel in terms of HIC.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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