Massive nitrogen supersaturation to CoCrMo alloys for surface microstructure control
CoCrMo alloys were plasma nitrided at 673 K for 14.4 ks to form a homogeneous nitrided layer with a thickness of 12 μm. This nitrogen-supersaturated layer had an expanded γ-phase with fine CrN precipitates. The nitrogen solute distributed homogeneously with its average content of 5 mass%...
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2023-11-01
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| Series: | Academia Materials Science |
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| author | Tatsuhiko Aizawa Tatsuya Funazuka Tomomi Shiratori Yohei Suzuki |
| author_facet | Tatsuhiko Aizawa Tatsuya Funazuka Tomomi Shiratori Yohei Suzuki |
| author_sort | Tatsuhiko Aizawa |
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CoCrMo alloys were plasma nitrided at 673 K for 14.4 ks to form a homogeneous nitrided layer with a thickness of 12 μm. This nitrogen-supersaturated layer had an expanded γ-phase with fine CrN precipitates. The nitrogen solute distributed homogeneously with its average content of 5 mass% toward the nitriding front end. This nitrided CoCrMo alloy matrix with its average grain size of 20 μm was plastically strained by the nitrogen supersaturation to significantly modify its original crystallographic microstructure. This nitrided layer consists of intensely textured grains with the orientation of (111) in the normal direction. The nitrided and textured layer had higher hardness 1,620 HV1N than the original polycrystalline CoCrMo matrix, 400 HV1N. Its average friction coefficient against the SUJ2 ball in dry was 0.4–0.5 under the applied load of 5 N and the sliding speed of 0.1 m/s. |
| format | Article |
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| institution | Kabale University |
| issn | 2997-2027 |
| language | English |
| publishDate | 2023-11-01 |
| publisher | Academia.edu Journals |
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| series | Academia Materials Science |
| spelling | doaj-art-fdab4f00597f47dd8c2988c66e78a4392025-02-10T22:52:42ZengAcademia.edu JournalsAcademia Materials Science2997-20272023-11-011110.20935/AcadMatSci6139Massive nitrogen supersaturation to CoCrMo alloys for surface microstructure controlTatsuhiko Aizawa0Tatsuya Funazuka1Tomomi Shiratori2Yohei Suzuki3Surface Engineering Design Laboratory, Shibaura Institute of Technology, Ota-City, Tokyo 144-0045, Japan.Faculty of Engineering, University of Toyama, Gofuku, Toyama 930-8555, Japan.Faculty of Engineering, University of Toyama, Gofuku, Toyama 930-8555, Japan.Department of R & D, Komatsu-Seiki Kosakusho, Co., Ltd., Suwa-City, Nagano 392-0012, Japan. CoCrMo alloys were plasma nitrided at 673 K for 14.4 ks to form a homogeneous nitrided layer with a thickness of 12 μm. This nitrogen-supersaturated layer had an expanded γ-phase with fine CrN precipitates. The nitrogen solute distributed homogeneously with its average content of 5 mass% toward the nitriding front end. This nitrided CoCrMo alloy matrix with its average grain size of 20 μm was plastically strained by the nitrogen supersaturation to significantly modify its original crystallographic microstructure. This nitrided layer consists of intensely textured grains with the orientation of (111) in the normal direction. The nitrided and textured layer had higher hardness 1,620 HV1N than the original polycrystalline CoCrMo matrix, 400 HV1N. Its average friction coefficient against the SUJ2 ball in dry was 0.4–0.5 under the applied load of 5 N and the sliding speed of 0.1 m/s.https://www.academia.edu/109429805/Massive_Nitrogen_Supersaturation_to_CoCrMo_alloys_for_Surface_Microstructure_Control |
| spellingShingle | Tatsuhiko Aizawa Tatsuya Funazuka Tomomi Shiratori Yohei Suzuki Massive nitrogen supersaturation to CoCrMo alloys for surface microstructure control Academia Materials Science |
| title | Massive nitrogen supersaturation to CoCrMo alloys for surface microstructure control |
| title_full | Massive nitrogen supersaturation to CoCrMo alloys for surface microstructure control |
| title_fullStr | Massive nitrogen supersaturation to CoCrMo alloys for surface microstructure control |
| title_full_unstemmed | Massive nitrogen supersaturation to CoCrMo alloys for surface microstructure control |
| title_short | Massive nitrogen supersaturation to CoCrMo alloys for surface microstructure control |
| title_sort | massive nitrogen supersaturation to cocrmo alloys for surface microstructure control |
| url | https://www.academia.edu/109429805/Massive_Nitrogen_Supersaturation_to_CoCrMo_alloys_for_Surface_Microstructure_Control |
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