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Metals
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Offshore Engineering Steel: Welding Performance and Microstructure Analysis
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Offshore Engineering Steel: Welding Performance and Microstructure Analysis

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Welding and Joining".

Deadline for manuscript submissions: closed (30 April 2024) | Viewed by 1417

Special Issue Editor

Dr. Xuelin Wang

E-Mail Website
Guest Editor
Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
Interests: HSLA steel; welding metals; heat-affected zone; mechanical properties; impact toughness; fatigue performance; corrosion performance; hardness; microstructure
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

With the continuous development of marine structures from shallow sea to deep sea regions, the strength and thickness of the steel used for the construction of the marine structure are gradually increasing. In addition, the construction of steel structures has more stringent requirements for the welding performance of the base material. But in the welding process, factors affecting the microstructure transformation, including the chemical composition of the base metal and welding material, welding procedures (heat input, interpass temperature, cooling rate, and welding thermal cycle), post-weld heat treatment, and others, are variable and less controllable. Thus, the microstructure transformed either in welding-heat-affected zone or weld metal is very complex. Nevertheless, any complex process of steel formation has its laws and can be effectively controlled on the premise of identifying its evolution process and influencing factors. Therefore, it is very important to study the principles of physical metallurgy and welding performance of offshore engineering steel.

Dr. Xuelin Wang
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Metals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • offshore engineering steel
  • weld metal
  • heat affected zoned
  • strength
  • impact toughness
  • fracture toughness
  • microstructure
  • hardness
  • corrosion

Published Papers (2 papers)

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Research

16 pages, 5217 KiB  
Article
Numerical Simulation of Temperature Evolution, Solid Phase Transformation, and Residual Stress Distribution during Multi-Pass Welding Process of EH36 Marine Steel
by Pengyu Wen, Jiaji Wang, Zhenbo Jiao, Kuijun Fu, Lili Li and Jing Guo
Metals 2024, 14(4), 476; https://doi.org/10.3390/met14040476 - 19 Apr 2024
Viewed by 407
Abstract
An investigation into the evolution of temperature and stress fields, as well as the phase transformation in marine steel EH36 during multi-pass welding, and their subsequent effects on Charpy impact toughness, remains in great lack. In this study, submerged arc welding (SAW) was [...] Read more.
An investigation into the evolution of temperature and stress fields, as well as the phase transformation in marine steel EH36 during multi-pass welding, and their subsequent effects on Charpy impact toughness, remains in great lack. In this study, submerged arc welding (SAW) was employed to carry out multi-pass welding on EH36 steel plates, followed by the low-temperature toughness test of weldments. Comsol software version 6.2 and finite element analysis are utilized to simulate the evolution of the microstructure, temperature, and residual stress fields throughout the multi-pass welding process. As welding progressed, the heat absorption along the vertical direction was enhanced; in contrast, a decrease is observed in the horizontal direction away from the heat source. This complicated temperature history favors the bainite transformation in the vicinity to the heat source, whereas areas more remote from the weld zone exhibit a higher prevalence of acicular ferrite due to the reduced cooling rate. The concentration of residual stress is predicted to occur at the boundary of the melt pool and at the interface between the weld and the heat-affected zone, with the greatest deformation observed near the fusion line at the top surface of the model. Furthermore, multi-pass welding may alleviate the residual stress, especially when coupled with the formation of acicular ferrite upon cooling, leading to improved low-temperature impact toughness in regions remote from the heat source. These findings offer valuable insights for the design and optimization of multi-pass welding in future applications. Full article
(This article belongs to the Special Issue Offshore Engineering Steel: Welding Performance and Microstructure Analysis)
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12 pages, 7678 KiB  
Article
The Influence of Centerline Segregation on Impact Toughness in Welding Heat-Affected Zone of X70 Pipeline Steel
by Fujian Guo, Han Zhang, Wenle Liu, Xuelin Wang and Chengjia Shang
Metals 2024, 14(2), 209; https://doi.org/10.3390/met14020209 - 07 Feb 2024
Viewed by 755
Abstract
The influence of centerline segregation on the low-temperature impact toughness of the heat-affected zone (HAZ) of welded joints was studied by welding experiments on X70 steel plates rolled from continuous casting slabs with segregation grades of class 2 and class 3. The experimental [...] Read more.
The influence of centerline segregation on the low-temperature impact toughness of the heat-affected zone (HAZ) of welded joints was studied by welding experiments on X70 steel plates rolled from continuous casting slabs with segregation grades of class 2 and class 3. The experimental results show that the impact toughness at HAZ from class 2 slab steel plate is more stable and has excellent low-temperature toughness than that of class 3 slab steel plate. The impact toughness of the HAZ of the class 3 slab steel plate is low to 100 J at −40 °C and has a severe fluctuation range (~150 J), and the delamination phenomenon is also observed in the fracture cross-section. The reason for this phenomenon is due to the enrichment of C and Mn elements in the centerline segregation zone. The formation of abnormal microstructure (martensite/bainite) in the segregation zone leads to stress concentration, which easily weakens the low-temperature toughness of the joint. Full article
(This article belongs to the Special Issue Offshore Engineering Steel: Welding Performance and Microstructure Analysis)
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