Effect of hydrogen on the microstructure and mechanical properties of high temperature deformation of Ti6Al4V additive manufactured |
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| Affiliation: | 1. Tech Institute for Advanced Materials, College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 210009, China;2. Key Laboratory of Power Beam Processing, AVIC Manufacturing Technology Institute, Beijing, 10024, China;3. School of Materials Engineering, Shanghai University of Engineering Science, Shanghai, 201620, China;1. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;2. Wuhan Second Ship Design and Research Institute, Wuhan 430064, China;1. Department of Chemical Engineering and Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, India;2. Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea;3. Analysis and Evaluation Department, Egyptian Petroleum Research Institute (EPRI), Nasr City, Cairo 11727, Egypt;1. Department of Computer Science and Electrical Engineering, Handong Global University, Pohang 791-708, S. Korea;2. Green Science Co, South Korea;1. Key Laboratory of Bionic Engineering (Ministry of Education), College of Biological and Agricultural Engineering, Jilin University, Changchun, Jilin 130022, China;2. School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China |
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| Abstract: | The additive manufactured Ti6Al4V-xH titanium alloy was compressed at 600°C–750 °C on a Gleeble 3800 testing machine, and the compression rates were 1s−1 and 0.01s−1, respectively. The experimental results show that with the increase of hydrogen content, the flow stress of the alloy decreases firstly and then increases gradually. When the hydrogen content is 0.27 wt%, the flow stress of titanium alloy is the smallest. EBSD and TEM analysis were carried out and show that the α lamellar microstructure became larger at 0.27H, the corresponding flow stress also decreased, and slip bands appeared in the alloy. Dislocation slip was an important deformation mechanism of the alloy. When the hydrogen content continued to increase, the α phase in the alloy gradually decreased, and α″ appeared at 0.81H. Therefore, adding appropriate hydrogen can reduce the alloy flow stress and improve the performance of titanium alloy during hot deformation. |
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| Keywords: | Additive manufacturing Ti6Al4V Microstructure evolution Thermal deformation |
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