Discussion on Formation and Control of Intermetallic Compounds During Welding of Different Metals
Wenbin Lu,
Yan Zhang,
Deshui Yu,
Jianping Zhou,
Daqian Sun
Issue:
Volume 6, Issue 2, June 2022
Pages:
10-17
Received:
3 April 2022
Accepted:
18 April 2022
Published:
21 June 2022
DOI:
10.11648/j.ajmme.20220602.11
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Views:
Abstract: The data set records the difficulties often encountered in the welding process of dissimilar metals and put forward some solutions, which provide an effective reference for the welding of dissimilar metals in the future. The connection of dissimilar metals is one of the most popular topics recently. At present, the connection methods of dissimilar metals are mechanical connection, bonding and welding. Mechanical connection can only be used in some areas with low requirements for sealing and surface smoothness because it cannot guarantee its sealing and surface smoothness. Bonding because of its poor connection strength can only be used in places where the strength requirements are not high. Since 2014, we have conducted dissimilar metal laser welding experiments on titanium (Ti)/steel and steel/aluminum (Al), and obtained more than 800 sets of data. By adjusting the welding parameters and welding process, safe and reliable joints can be obtained. A large number of studies have found that the main factor affecting the strength of dissimilar metal joints is the formation of a large number of intermetallic compound (IMCs) during welding, and most of IMCs are brittle phases. In order to further control the formation of IMCs in the process of dissimilar metal welding, we invented a new welding structure by using the special advantages of explosive welding. A large number of experiments show that the structure can effectively avoid the formation of IMCs in the welding process. In order to obtain high strength and good performance joints, control the formation of IMCs has become a key means.
Abstract: The data set records the difficulties often encountered in the welding process of dissimilar metals and put forward some solutions, which provide an effective reference for the welding of dissimilar metals in the future. The connection of dissimilar metals is one of the most popular topics recently. At present, the connection methods of dissimilar ...
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A Review on Functionally Graded-Thermal Barrier Coatings (FG-TBC) Fabrication Methods in Gas Turbines
Issue:
Volume 6, Issue 2, June 2022
Pages:
18-26
Received:
21 June 2022
Accepted:
27 July 2022
Published:
17 August 2022
DOI:
10.11648/j.ajmme.20220602.12
Downloads:
Views:
Abstract: Functionally Graded Materials (FGMs) are good choices to provide a more efficient thermal barrier coating (TBC), to be utilized in engineering areas such as power generation sector (electricity) as well as in aerospace engines. Energy scarcity and ever-increasing demands for higher electricity generation in gas turbines, result in advances in TBC structure and fabrication methods to improve mechanical and thermomechanical properties of the coating in harsh working condition. This will result in diminishing detrimental effects of elevated temperature and also enhance power efficiency. Using metal-ceramic materials of Nano dimension particles in coating materials and structures, besides electron beams and thermal plasmas as primitive and most reliable sources of energy, in electron beam physical vapor deposition (EB-PVD) and atmospheric plasma spray (APS) respectively, which are two contemporary fabrication processes, lead to a more productive coating structure in TBCs. The new gas turbine generation, benefits from TBC coatings with both improved thermal conduction and radiation resistance, so the candidate material is selected as a finishing layer to multilayer systems of FG-TBC, that tends to be transparent to the radiation in the turbine working condition. While there are many possible variations for material combination in FGM production, industrial issues must be concerned in this regard. This paper presents a review of the existing literature for Thermal Barrier Coatings (TBCs) made of Functionally Graded Materials (FGMs) which are called FG-TBCs, and then focuses on EB-PVD and APS as the most commonly used fabrication techniques for thin FGM coating.
Abstract: Functionally Graded Materials (FGMs) are good choices to provide a more efficient thermal barrier coating (TBC), to be utilized in engineering areas such as power generation sector (electricity) as well as in aerospace engines. Energy scarcity and ever-increasing demands for higher electricity generation in gas turbines, result in advances in TBC s...
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