2014 Fiscal Year Final Research Report
Development of biocompatible stainless steel and beta-type Ti alloy with high-nitrogen surface layer made by solution nitriding
| Project/Area Number |
24560093
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Gifu University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
KAKIUCHI Toshifumi 岐阜大学, 工学部, 准教授 (20452039)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Keywords | 疲労 / 腐食疲労 / 窒素固溶 / 表面硬化 / 窒化物析出 |
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| Outline of Final Research Achievements |
Biocompatible stainless steel and beta-type Ti alloy with high-nitrogen surface layer were fabricated by solution-nitriding method. Type 304 stainless steel and beta-type Ti alloy were solution nitrided at high temperature. Solution nitriding resulted in the formation of surface-hardened layer, which was beneficial for wear resistance. In Type 304, fatigue strengths in laboratory air were highly improved by solution nitriding due to the surface-hardened layer. However, precipitation of chromium nitrides (CrN) occurred during solution nitriding, resulting in the formation of Cr-depicted zone along grain boundary. Consequently, corrosion fatigue strengths in 3%NaCl solution decreased compared with un-treated material. Solution-nitrided beta-type Ti alloy exhibited lower fatigue strengths in laboratory air than un-treated material due to the sever grain growth during solution nitriding.
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| Free Research Field |
材料強度学
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