Synthesis and microstructure evolution of WCoB based cermets during spark plasma sintering |
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| Affiliation: | 1. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China;2. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing, 100083, China;3. Beijing Laboratory of Metallic Materials and Processing for Modern Transportation, University of Science and Technology Beijing, Beijing, 100083, China;4. Beijing Key Laboratory of Materials Genome Engineering, University of Science and Technology Beijing, Beijing, 100083, China;5. Department of Materials Science and Engineering, Ohio State University, 2041 N. College Road, Columbus, OH, 43210, USA;6. Center of Innovative Sintering Parts, Pennsylvania State University-University Park Campus, 312 Old Main, Pennsylvania, 16802, USA;7. Kennametal Incorporated Company, 1600 Technology Way, Latrobe, PA, 15650, USA;8. Chongqing Engineering Technology Research Center for Light Alloy and Processing, Chongqing Three Gorges University, Chongqing, 404000, China;9. Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing, 100083, China |
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| Abstract: | WCoB based cermets were prepared by spark plasma sintering at sintering temperature among 600°C-1200 °C. The phase evolution was investigated by detecting density behavior, phase composition, microstructure and mechanical properties during sintering process. The sintering process can be divided into three stages: powder densification, solid phase reaction and liquid phase sintering. WCoB hard phase forms at 1000 °C during solid phase sintering, showing better mechanical properties than Co2B, especially on Vicker's hardness. WCoB hard phase forms on the basis of Co2B binary boride and its content increases in liquid phase sintering stage with high density. The Vicker's hardness and transverse rupture strength (TRS) reach the maximum value of 1262 Hv and 1212 MPa at 1200 °C and 1170 °C, respectively. The fracture toughness reaches the maximum value of 21.8 MPa m1/2 at 1050 °C, and the inter-granular fracture is the main fracture mechanism. |
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| Keywords: | WCoB Spark plasms sintering Phase evolution First principle calculation Mechanical properties |
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