東京工業大学 · 工学
Motoki Sakaguchi教授の研究室では、ニッケル基超合金の疲労挙動、特に単結晶超合金における疲労き裂伝ぱのメカニズムと微視的メカニズムの解明を主な研究テーマとしています。温度依存性や微細組織（ラフト構造、γ'相の形状）が疲労き裂伝ぱに与える影響を実験的・数倞性にわたり解明しており、特に高温域での熱機械的疲労や近閾値域でのき裂伝ぱ挙動に注力しています。実機部材からの微小試料を用いた実験的手法の開発も進めており、実用的応用に結びつく材料挙動の予測技術の構築を目指しています。
Figures are computed from collected data and may differ slightly.
Abstract Effects of rafted microstructure and its temperature dependency on fatigue crack propagation (FCP) in a single‐crystal Ni‐base superalloy are experimentally investigated. FCP tests are conducted at room temperature, 450°C, and 700°C for two types of pre‐rafted specimens, and their FCP behaviors are compared with that of a specimen with cuboidal γ′ precipitates. It is found in the experiments that there is no significant influence of rafted microstructures on FCP rate at room temperature
Behavior of thermo-mechanical fatigue (TMF) of a single crystal Ni-base superalloy, CMSX-4, was studied, compared with that of isothermal low-cycle fatigue (LCF). Strain-controlled TMF and LCF tests of CMSX-4 were carried out under various test conditions, where the experimental variables were strain rates, strain ratio, temperature range, and strain/temperature phase angle. At first it was shown experimentally that the TMF and LCF failures took places, associated with some noteworthy characteri
This chapter contains sections titled: Introduction Experimental Procedures Results and Discussion Summary Acknowledgements
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