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Metals
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Microstructure Evolution in Welded Joints
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Microstructure Evolution in Welded Joints

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

Deadline for manuscript submissions: closed (31 July 2023) | Viewed by 2776

Special Issue Editor

Dr. Wenjian Zheng

E-Mail Website
Guest Editor
School of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023, China
Interests: advanced welding and joining technology; welding structure mechanics and reliability; virtual simulation of material processing

Special Issue Information

Dear Colleagues,

The microstructure of a weld is the connection between the manufacturing processes and mechanical properties. Thus, understanding the Microstructure Evolution of the weld during forming, welding, heat treatment, and service is very important to welding theory development and engineering applications.

This Special Issue aims to collect innovative studies on welding metallurgy theory regarding the influence of welding parameters on microstructure evolution, such as dendrite growth in the welding pool, solid-state phase transformation in the cooling progress, hydrogen diffusion behavior throughout the whole welded joint’s formation, and so on. Additionally, we are interested in the latest investigations into the effect of microstructure characteristics on the mechanical properties of welds in engineering applications, such as strength, toughness, fatigue, creep, corrosion resistance, friction and wear resistance.

Dr. Wenjian Zheng
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

  • microstructure evolution
  • welding metallurgy
  • dendrite growth
  • solid-state phase transformation
  • hydrogen diffusion
  • mechanical property

Published Papers (2 papers)

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Research

14 pages, 6347 KiB  
Article
Effects of Micro-Arc Oxidation Surface Treatment on the Corrosion Resistance of Ti-6Al-4V Electron-Beam-Welded Joints
by Yinghe Ma, Peng Wu, Jinhui Mei, Zhen Yu, Jianguo Yang, Yanming He, Huaxin Li, Chuanyang Lv, Sendong Ren, Jianping Xu, Zhihui Cai and Paul K. Chu
Metals 2023, 13(7), 1161; https://doi.org/10.3390/met13071161 - 22 Jun 2023
Cited by 2 | Viewed by 1338
Abstract
Micro-arc oxidation (MAO) is performed on Ti-6Al-4V electron-beam-welded joints, and the microstructure, phase composition, and corrosion resistance of the joint and surface coating are investigated systematically by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), as well as electrochemical and [...] Read more.
Micro-arc oxidation (MAO) is performed on Ti-6Al-4V electron-beam-welded joints, and the microstructure, phase composition, and corrosion resistance of the joint and surface coating are investigated systematically by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), as well as electrochemical and stress corrosion analyses. SEM analyses revealed that the joint undergoes a phase transformation. The coating morphology of the joint and base materials is similar, but the joint coating is denser and thicker. XRD analyses recognize the rutile and anatase phases in the coating. Polarization and electrochemical impedance spectroscopy (EIS) corrosion tests reveal that the MAO treatment results in a decrease of two orders of magnitude in the corrosion current density of the welded joint and an increment of corrosion resistance. Stress corrosion evaluation reveals that a dense layer is exposed to protect the joint after long-term exposure to a high-stress corrosion environment. No stress corrosion-induced cracking or defects are observed in the joints, indicating the corrosion resistance of the joint has significantly improved. Full article
(This article belongs to the Special Issue Microstructure Evolution in Welded Joints)
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14 pages, 8669 KiB  
Article
Investigation of the Mesoscale Damage Evolution Process of AA5754O Aluminum Alloy CMT Welded Joints
by Wenyuan Kang, Qiuren Chen, Li Huang, Jingyi Zhang, Zehong Hou, Xianhui Wang, Weijian Han and Erlie Wang
Metals 2023, 13(3), 555; https://doi.org/10.3390/met13030555 - 9 Mar 2023
Viewed by 1127
Abstract
The microstructure and tensile failure evolution of AA5754O aluminum alloy CMT joints were investigated in this study. First, the microstructure and properties of aluminum alloy were observed using a hardness test and metallographic test. The microstructure and tensile failure evolution of AA5754O aluminum [...] Read more.
The microstructure and tensile failure evolution of AA5754O aluminum alloy CMT joints were investigated in this study. First, the microstructure and properties of aluminum alloy were observed using a hardness test and metallographic test. The microstructure and tensile failure evolution of AA5754O aluminum alloy CMT joints were studied using in situ CT tests. The defects in the heat-affected zone were mainly composed of pores with large sphericity. The softening failure was mainly due to the decrease in the effective bearing area due to the increase in the number of defects. There were a large number of shrinkage pores with sphericity less than 0.6 in the fusion zone defects. The softening failure was mainly due to the continuous growth and combination of shrinkage pores, which led to a decrease in the effective bearing area. Meanwhile, the variation process of the mean radii of the meso-defects in the heat-affected zone and fusion zone were analyzed. The material constants αRT and αRTm were 1.87 and 6.20 in the heat-affected zone and 7.21 and 5.31 in the fusion zone, respectively, which were found using the Rich and Tracey model and the improved Rich and Tracey model. Full article
(This article belongs to the Special Issue Microstructure Evolution in Welded Joints)
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