- Name : Koji Kakehi
- Position : Professor
Department of Mechanical Systems Engineering, Tokyo Metropolitan University - Address : 1-1 Minami-osawa, Hachioji, Tokyo, JAPAN
- TEL : +81-42-677-2712
- FAX : +81-42-677-2712
- E-mail : kkakehi@tmu.ac.jp
- Favorite sports : Mountaineering, Faltboat
- Research : Mechanical properties and microstructure of heat resistant alloys for aircraft engine
The turbine rotor blade of the aircraft engine and the power generation gas turbine receives flaming gas that exceed 1500℃ and rotates at transonic speed. The Ni based superalloys are used for the turbine blade under such a severe environment. The single-crystal Ni based superalloys are put to practical use in the aircraft engine because of their excellent creep and thermal fatigue properties. The polycrystalline Ni base superalloys and a titanium alloy of the turbine disk are also researched. We focus on understanding the fundamental mechanisms determining the mechanical properties of aerospace materials to improve the mechanical properties and reliability of them.
Additive manufacturing，Aircraft engine，Gas turbine， Ni based superalloy，Titanium aluminide
1) K. Kakehi, S.Banoth, Y.-L. Kuo, S.Hayashi, Effect of yttrium addition on creep properties of a Ni-base superalloy built up by selective laser melting, Scripta Materialia, in press.
2) T. Nagahari, T. Nagoya, K. Kakehi, N. Sato, S. Nakano, Microstructure and Creep Properties of Ni-Base Superalloy IN718 Built up by Selective Laser Melting in a Vacuum Environment, Metals 2020, 10(3), 362; https://doi.org/10.3390/met10030362
3) H. Yu, S. Hayashi, K. Kakehi, Y-L Kuo, Metals 2019, 9(1), 19;https://doi.org/10.3390/met9010019.
4) Y.L. Kuo, A. Kamigaichi, K. Kakehi, Characterization of Ni-Based Superalloy Built by Selective Laser Melting and Electron Beam Melting, Metall. Mater. Trans.A, 49(2018) , pp 3831-3837
5) Y.L. Kuo,T. Nagahari, K. Kakehi, The Effect of Post-Processes on the Microstructure and Creep Properties of Alloy718 Built Up by Selective Laser Melting, Materials 2018, 11, 996; doi:10.3390/ma11060996
6) K. Akino, K. Kakehi, Strengths and Microstructure of SUS316L Fabricated by Selective Laser Melting, Mater. Trans, 59 (2018), pp. 482-487, doi.org/10.2320/matertrans.M2017163
7) T.K. Tsao, A.C. Yeh, C.M. Kuo, K. Kakehi, H. Murakami, The High Temperature Tensile and Creep Behaviors of High Entropy Superalloy, Scientific reports 2017 |7: 12658 | DOI:10.1038/s41598-017-13026-7.
8) T.K. Tsao, A.C. Yeh, J.W. Yeh, M.S. Chiou, C.M. Kuo, H. Murakami, K. Kakehi, High Temperature Properties of Advanced Directionally-Solidified High Entropy Superalloys, Superalloys2016, pp.1001-1009.
9) Y.L. Kuo, K. Kakehi, Comparison of microstructures and properties for a Ni-base superalloy (Alloy718) fabricated by solid-state sintering and fully-melting process, Metals, 2017, 7, 367; doi:10.3390/met7090367.
10) Y.L. Kuo, K. Kakehi, Effect of the Prior Particle Boundary on the Microstructure and Mechanical Properties of Hot-Isostatic-Pressed IN718 Alloy, Materials Transactions, Vol.58, No.7, pp.1042-1048, 2017.(doi.org/10.2320/matertrans.M2017045)
11) Y.L. Kuo, S. Horikawa, K. Kakehi, The effect of interdendritic δ phase on the mechanical properties of Alloy 718 built up by additive manufacturing, Materials and Design, 116 (2017) 411-418.(doi.org/10.1016/j.matdes.2016.12.026)
12) Y.L. Kuo, S. Horikawa, K. Kakehi, Effects of build direction and heat treatment on creep properties of Ni-base superalloy built up by additive manufacturing, Scripta Materialia, 129 (2017), 74-78 (doi.org/10.1016/j.scriptamat.2016.10.035)
13) N. Tsuno, K. Kakehi, C.M.F. Rae and R. Hashizume, The effect of Ruthenium on creep strength of Ni-base single crystal superalloys at 750 °C and 750 MPa, Metallurgical and Materials Transactions A, (2009), pp. 269-272.
14) M. Yamashita, K. Kakehi, Tension/Compression Asymmetry in Yield and Creep Strengths of Ni-Based Superalloy with High Amount of Tantalum, Scripta Materialia, Vol. 55, (2006), pp.139 -142.
15) Y.Kikuchi, K.Kakehi, K.Kitazono, E.Sato, K.Kuribayashi; Magnesium Foam Produced from Bulk AZ31 Magnesium Alloy Sheets , Materials Science Forum Vols. 475-479, pp. 501-504, (2005)
16) H.Takagi, M.Fujiwara and K.Kakehi, Measuring Young's modulus of Ni-based superalloy single crystals at elevated temperatures through microindentation ,Materials Science and Engineering A, A387-389, pp.348-351, (2004)
17) K. Kakehi, Influence of Primary and Secondary Crystallographic Orientations on Strengths of Nickel-Based Superalloy Single Crystals, Materials Transactions, 45 (2004), pp.1824-1828
18) K. Kakehi, Effect of Plastic Anisotropy on Creep Strengths of Single Crystals of a Ni-Base Superalloy, Metall. and Mater. Trans. A, 31A, pp. 421-430, (2000)
19) K. Kakehi: Effect of Primary and Secondary Precipitates on Creep Strength of Ni-base Superalloy Single Crystals, Materials Science and Engineering A, A278, pp. 135-141 (2000)
20) K. Kakehi: Effect of Plastic Anisotropy on Tensile Strength of Single Crystals of a Ni-Base Superalloy ; Scripta Materialia, 42, pp. 197-202 (2000)
21) K. Kakehi: Influence of Secondary Precipitates and Crystallographic Orientation on Strength of Single Crystals of a Ni-Base Superalloy, Metall. and Mater. Trans. A, 30A, pp.1249-1259 (1999)
22) K. Kakehi: Tension/Compression Asymmetry in Creep Behavior of a Ni-Based Superalloy, Scripta Materialia, 41, pp. 461-465 (1999)
23) K. Kakehi: Influence of Precipitate Size and Crystallographic Orientation on Strength of a Single Crystal Ni-Base Superalloy, Materials Transactions, JIM, vol. 40, pp.158-166 (1999)
24) T. Sakaki, , K. Kakehi : Plastic Anisotropy of Sheets with Continuously Varying Anisotropic Parameters and Flow Stress, Metall. and Mater. Trans. A, 27A, pp. 317-326 , (1996)
25) T. Sakaki, Y.Otakara, K. Kakehi: Plastic Anisotropy of Clad Sheets, International Journal of Plasticity, vol. 7, pp. 505-527, (1991)
1) T. Tateno, K. Kakehi, S. Aomura, Creation Project on Department of Precision Engineering, Tokyo Metropolitan Univ.
1) Tension/compression Asymmetry of Creep Strength of Ni-Based Single Crystal Superalloys, N. Tsuno, S. Shimabayashi, K. Kakehi, C.M.F. Rae and R.C. Reed, Superalloys 2008, (2008), pp.433-441
2) Tension/compression Asymmetry of Creep Strength of Ni-Based Single Crystal Superalloys, N.Tsuno and K.Kakehi, International Gas Turbine Congress 2007 Tokyo, (2007)TS-091
3) Influence of Plastic Anisotropy on Creep Strength of Nickel-Based Superalloy Single Crystals H. Koyabu, N. Tsuno and K. Kakehi, Materials for Advanced Power Engineering, pp.299-308, (2006)
4) G.L. Drew, R.C. Reed, K. Kakehi, and C.M.F. Rae, The Transition from Primary to Secondary Creep, 10th International Symposium on Superalloys, 2004, in press
5) C.M.F. Rae, K. Kahehi and R.C. Reed, On the effect of rhenium on the extent of primary creep in advanced Ni-based superalloys, Proceedings of the 7th Liege Conference on 'Materials for Advanced Power Engineering' Eds J. Lecomte-Beckers, M. Carton, F. Schubert and PJ Ennis, p207.
6) H. Tamaki, K. Fujita, A. Okayama, N. Matsuda, A. Yoshinari and K. Kakehi, A Study on Bending Deformation Behavior of Ni-Based DS and SC Superalloys, Superalloys2004, (in press)
7) K. Kakehi: Influence of primary and secondary crystal orientations on strengths of Ni-based superalloy single crystals, Proc. of 9th International Conference on Creep & Fracture of Engineering Materials & Structure, Swansea (U.K.), pp. 447-455 (2001)
8) K. Kakehi, A. Morioka: Influence of Secondary Precipitates on Strength of Single Crystals of Ni-Base Superalloys, Proc. of Euromat 99, International Congress on Advanced Materials and Processes , Vol. 10, 1999
9) K. Kakehi, T. Sakaki, T. Adachi: Creep and Fatigue Strength of Single-Crystals of a Nickel-Base Superalloy, Proc. of 7th JIM Int. Sympo. on Aspects of High Temperature Deformation and Fracture in Crystalline Materials, pp. 535-542, (1993)
10) K. Kakehi, T. Sakaki, T. Adachi Creep and Fatigue Strength of Single-Crystals of a Nickel-Base Superalloy, Proc. of 7th JIM Int. Sympo. on Aspects of High Temperature Deformation and Fracture in Crystalline Materials, pp. 535-542, (1993)
11) K. Kakehi, , T. Sakaki, J.M. Gui, Y. Misaki: Influence of Orientation and Heat Treatment on Creep Strength of Single Crystals of a Ni-Base Superalloy Proc. of 5th Int. Conf. on Creep and Fracture of Engineering Materials and Structures, pp221-230,(1993)
12) T. Sakaki, K. Kakehi, T. Adachi, T. Tanaka: Orientation Dependence of Tensile Properties of Single Crystals of Ni-Base Superalloys, Proc. of 4th Int. Conf. on Creep and Fracture of Engineering Materials and Structures, pp313-322, (1990)