Microstructures and properties of TC4 ELI alloy with horizontal EBW for submersible manned cabin |
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| Institution: | 1. Shanghai Engineering Research Center of Marine Renewable Energy, College of Engineering Science and Technology, Shanghai Ocean University, Shanghai, 201306, China;2. State Key Laboratory of Ocean Engineering, School of Naval Architecture, Civil and Ocean Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China;3. Baoji Titanium Industry Co., Ltd., Baoji, 721014, China;1. National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;2. Department of Materials Science and Engineering, University of Toronto, Toronto, ON M5S 3E4, Canada;3. HIT-Chungu Joint Research Center for Additive Manufacturing Materials, Anhui Chungu 3D Printing Institute of Intelligent Equipment and Industrial Technology, Wuhu 241200, China;4. Laboratory for Space Environment and Physical Science, Harbin Institute of Technology, Harbin 150001, China;5. AVIC Manufacturing Technology Institute, Beijing 100024, China;6. School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China;7. Yunnan Titanium Industry Co., Ltd., Chuxiong 651209, China;1. School of Naval Architecture and Ocean Engineering, Harbin Institute of Technology (Weihai), Weihai, 264209, PR China;2. Technology Department, Zhejiang Shipping Group Co., Ltd, Hangzhou, 310005, PR China |
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| Abstract: | The welding was one of the technologies to manufacture manned cabin, which was a significant part of the submersible. To improve the procedure, horizontal EBW was employed on TC4 ELI alloy with 60 mm thickness, and the microstructures and properties of the joints were investigated. The crystals and microstructures of the welds were homogeneous from the top to bottom, and the microhardness of the weld was equivalent, which was harder than that of the base metal. The tensile properties of the joints were homogeneous along the penetration. The tensile strength and yield strength of the joints were higher than those of the base metal, and the percentage elongation after fracture was 80% of the base metal, which indicated the strength mis-match as overmatching. The impact toughnesses of the welds were equivalent along the penetration, which reached 80% of the base metal. The joint specimens were bended to 180° with no cracks. The investigation verified the excellent procedure and properties of horizontal EBW, which would make China become one of the countries with the capacity of manufacturing submersible cabin. |
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| Keywords: | EBW (electron beam welding) Horizontal gun Titanium alloy Microstructure Mechanical properties |
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