Microstructure of laser cladded carbide reinforced Inconel 625 alloy for turbine blade application |
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| Affiliation: | 1. AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Department of Ceramics and Refractories, Krakow, Poland;2. AGH University of Science and Technology, Faculty of Metals Engineering and Industrial Computer Science, Department of Surface Engineering and Materials Characterisation, Krakow, Poland;1. Singapore Institute of Manufacturing Technology, 73 Nanyang Dr, Singapore 637662, Singapore;2. School of Mechanical & Aerospace Engineering College of Engineering, Nanyang Technological University, 50 Nanyang Ave, 639798, Singapore;1. Department of Mechanical Engg., National Institute of Technology Karnataka, Surathkal, Karnataka, India;2. Department of Mechanical Engg., Malnad College of Engg., Hassan, Karnataka, India;1. Research and Development Center, Harbin Welding Institute, Harbin 150028, China;2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;3. National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing, 100072, China;1. State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, China;2. School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan, China |
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| Abstract: | Inconel 625 - WC metal matrix composite is a very promising material for high temperature applications. In this study, microstructure investigation and phase composition of a mixture between Inconel 625 and fine tungsten carbide (φ≈0.64 µm) was performed by means of XRD, SEM with EDS and TEM with EDS. Two powder mixtures were prepared: 20 wt% of WC and 30 wt% of WC and deposited on Inconel 625 substrate by laser cladding obtaining a crack and pore free material. The high temperature of the process resulted in partial dissolution of WC in Inconel 625 matrix. In sample containing 30 wt% of WC appearance of topologically close-packed (TCP) phases was observed at grain boundaries. WC, W2C, NbC, W6C2.54 and (W,Cr,Ni)23C6 were detected by XRD. Angular residual carbides and spherical oxide precipitates were visible in both types of samples. Processes occurring during laser action were explained. |
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| Keywords: | Metal matrix composites Ceramic reinforcement Inconel 625 Tungsten carbide Additive manufacturing Microstructure |
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