| Microstructure and cutting performance of Ti（C, N）-based cermets heat-treated in nitrogen |
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| 作者姓名： | LIU Wenjun XIONG Weihao ZHENG Yong SHI Zengmin YE Jiajian |
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| 作者单位： | [1]State Key Laboratory of Plastic Forming Simulation and Die ＆ Mould Technology of China, Huazhong University of Science ＆ Technology, Wuhan 430074, China [2]China Three Gorges University, Yichang 443002, China [3]Nanjing University of Aeronautics and Aslronautics, Nanjing 210016, China |
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| 摘 要： | Ti（C, N）-based cermets were treated using hot isostatic pressing （HIP） at 1423 K in nitrogen. The microstructures compared with the as-sintered cermets were investigated using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray analysis, and electron microprobe analysis. It was found that high nitrogen activity in the surface zone resulted in the formation of gradient structure. Approximately 20-1am-deep, nitrogen-rich and titanium-rich hard surface zone was introduced by the heat treatment. The nitrogen activity was the driving force that caused the transportation of the atoms through the binder, titanium towards the surface, and tungsten and molybdenum inwards. In the surface zone, the particle size became fine, the inner rim disappeared, and the volume fraction of the outer rim and the binder phase considerably reduced. Small grains of TiN, WC, Mo2C, and nitrogen-rich carbonitlide phases formed in the surface zone during the heat treatment, improving the tlibological property of the heat-treated cermet.
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| 关 键 词： | 钛基金属陶瓷 热处理 微观结构 机械性能 |
| 收稿时间： | 16 July 2006 |
| 修稿时间： | 2006-07-16 |
Microstructure and cutting performance of Ti(C, N)-based cermets heat-treated in nitrogen |
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| LIU Wenjun XIONG Weihao ZHENG Yong SHI Zengmin YE Jiajian.Microstructure and cutting performance of Ti(C, N)-based cermets heat-treated in nitrogen[J].Rare Metals,2007,26(4):352-358. |
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| Authors: | LIU Wenjun XIONG Weihao ZHENG Yong SHI Zengmin YE Jiajian |
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| Affiliation: | 1. CEIT and TECNUN, Paseo de Manuel Lardizábal 15, 20018 San Sebastián, Guipúzcoa, Spain;2. School of Engineering, Panamerican University, Mexico City 03920, Mexico;3. IK4 LORTEK Technological Center, Arranomendi Kalea 4A, 20240 Ordizia, Gipuzkoa, Spain |
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| Abstract: | Ti(C, N)-based cermets were treated using hot isostatic pressing (HIP) at 1423 K in nitrogen. The microstructures compared with the as-sintered cermets were investigated using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray analysis, and electron microprobe analysis. It was found that high nitrogen activity in the surface zone resulted in the formation of gradient structure. Approximately 20-μm-deep, nitrogen-rich and titanium-rich hard surface zone was introduced by the beat treatment. The nitrogen activity was the driving force that caused the transportation of the atoms through the binder, titanium towards the surface, and tungsten and molybdenum inwards. In the surface zone, the particle size became fine, the inner rim disappeared, and the volume fraction of the outer rim and the binder phase considerably reduced. Small grains of TiN, WC, Mo2C, and nitrogen-rich carbonitride phases formed in the surface zone during the heat treatment, improving the tribological property of the heat-treated cermet. |
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| Keywords: | Ti(C N)-based cermets heat-treatment in nitrogen microstructure mechanical properties |
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