Hot-deformation behaviour and hot-processing map of melt-hydrogenated Ti6Al4V/(TiB+TiC) |
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| Affiliation: | 1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;3. Beijing Aeronautical Manufacture Technology Research Institute, Beijing 100024, China;1. Institute of Frontier Materials, Deakin University, Geelong, Australia;2. Mechanical and Manufacturing Department, Mondragon University, Gipuizkoa, Spain;3. School of Engineering, Deakin University, Geelong, Australia;4. Research and Development, Mishra Dhatu Nigam Limited, Hyderabad, India;1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, 710072, Xi''an, PR China;2. Université de Lorraine, CNRS, Arts et Métiers ParisTech, LEM3, F-57000, Metz, France;3. Laboratory of Excellence on Design of Alloy Metals for low-mAss Structures (DAMAS), Université de Lorraine, 57073, Metz, France;4. German Engineering Materials Science Center at MLZ, Helmholtz-Center Geesthacht, D-85748, Garching, Germany;1. Institute of Frontier Materials, Deakin University, Geelong, Australia;2. School of Engineering, Deakin University, Geelong, Australia;3. Kalyani Center for Technology and Innovation, Bharat Forge Ltd., Pune, India |
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| Abstract: | The hydrogen was straight-forward added to the Ti 6Al4V/(TiC + TiB) composites (TiC TiB=5 vol.%) by melt hydrogenation. The results of hot compression show that the peak resistance of titanium matrix composites (TMCs) decreased by 17.2% when hydrogen content was 0.035 wt% compared with the TMCs without hydrogen. Therefore, the TMCs with a hydrogen content of 0.035 wt% was performed to a thermal compression experiment. Thermal-deformation characteristics and hot processing map of TMCs with a hydrogen content of 0.035 wt% were analyzed in the light of the flow stress curve, constitutive relations, and the dynamic-material model. The computed apparent activation energy was 284.54 kJ/mol, and the corresponding strain-rate sensitivity, power dissipation, and instability parameter were calculated. The hot-processing map exhibited maximum efficiencies of power dissipation at 780–840 °C/0.005–0.06 s−1 and there was only one instable region. The microstructures corresponding to the stable and instable region were verified, confirming the optimum processing parameters of hot-working that can be used as a reference for hot deformation of hydrogenated composites. |
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| Keywords: | Melt hydrogenation Hot compressions simulation Constitutive equation Processing map |
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