Details of a Researcher - Komotori, Jun

Komotori, Jun

写真a

Affiliation: Faculty of Science and Technology, Department of Mechanical Engineering (Yagami)

Position: Professor

Related Websites

http://www.komotori.mech.keio.ac.jp

External Links

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Profile Summary 【 Display / hide 】

Metallic boimaterials,such as stainless steel and titanium alloys, are required to have certain desirable properties for application in bio-implant prostheses. The aim of this laboratory is to develop a new biomaterials and a new surface modification processes. For detailed information, please visit our home page.

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Career 【 Display / hide 】

1990.04

-

1994.03

慶應義塾大学（理工学部） ,助手
1994.04

-

1998.03

慶應義塾大学（理工学部） ,専任講師
1998.04

-

2007.03

慶應義塾大学（理工学部） ,助教授
2007.04

-

2008.03

慶應義塾大学（理工学部）,准教授
2008.04

-

Present

慶應義塾大学（理工学部）,教授

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Academic Background 【 Display / hide 】

1985.03

Keio University, Faculty of Science and Engineering, 機械工学科

University, Graduated
1987.03

Keio University, Graduate School, Division of Science and Engineeri, 機械工学専攻

Graduate School, Completed, Master's course
1990.03

Keio University, Graduate School, Division of Science and Engineeri, 機械工学専攻

Graduate School, Completed, Doctoral course

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Academic Degrees 【 Display / hide 】

工学　, Keio University, 1990.03

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Research Areas 【 Display / hide 】

Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Mechanics of materials and materials
Nanotechnology/Materials / Structural materials and functional materials

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Research Keywords 【 Display / hide 】

材料強度学
生体材料
疲労設計
表面改質

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Books 【 Display / hide 】

初心者のための疲労用語の解説

小茂鳥潤ほか, 日本材料学会, 2015.08
Electrolytic In-Process Dressing (ELID) Technologies

H.Ohmori, Ioan D. Marinescu, K.Katahira,Y.Watanabe,　H.kasuga, J.Komotori, S.Yin,M.Mizutani,T.Naruse,, CRC Press, 2011
改訂　材料強度学

小茂鳥潤ほか, 日本材料学会, 2005
先端医療シリーズ・歯科医学１　歯科インプラント

小茂鳥潤，李秉濬, 先端医療技術研究所, 2000.01

Scope: 76-81

　View Summary

（第2章・第6節）
日本機会学会

小茂鳥潤，他988名, 日本機械学会, 1997.08

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Papers 【 Display / hide 】

Estimation of residual stress relaxation in low alloy steel with different hardness during fatigue by in situ X-ray measurement

Hayama: M., Kikuchi S., Tsukahara M., Misaka Y., Komotori J.

International Journal of Fatigue (International Journal of Fatigue) 178 2024.01

ISSN 01421123

　View Summary

In situ X-ray stress measurements were conducted to investigate the relaxation of compressive residual stress induced by fine particle peening during fatigue. To quantitatively assess the stability of the compressive residual stress, a concept of relaxation threshold stress was proposed. The relaxation threshold stress, which indicates the stability of the compressive residual stress, showed a direct correlation with specimen hardness. If the combined value of the compressive residual stress and compressive applied stress surpass the relaxation threshold stress, then the compressive residual stress relaxes. The relaxation threshold stress can be used to estimate the relaxation that occurs during fatigue.
- Access to Document (DOI)
Change Behavior of Retained Austenite and Residual Stress on Carburized SCM420H Steel during Fatigue Process

M. Hayama, Y. Maki, S. Kikuchi, J. Komotori

ISIJ International 64 ( 3 ) 597 - 604 2024

Accepted
- Access to Document (DOI)
Estimation of residual stress relaxation in low alloy steel with different hardness during fatigue by in situ X-ray measurement,

M．Hayama, S. Kikuchi, M. Tsukahara, Y. Misaka, J.Komotori,

International Journal of Fatigue 178 2024

Accepted
- Access to Document (DOI)
Effect of surface characteristics on the axial fatigue properties and wear resistance of Ti-6Al-4V alloy nitrided by gas blow induction-heating

S. Takesue, R. Suyama, M. Hayama, Y. Koyanagi, Y. Misaka, J. Komotori

Engineering Failure Analysis (Engineering Failure Analysis) 157 ( 107933 ) 2024

Accepted, ISSN 13506307

　View Summary

The effects of surface characteristics on the axial fatigue properties and wear resistance of the GBIH-nitrided titanium alloy were investigated to improve the fatigue strength and wear resistance of Ti-6Al-4V alloy rapidly nitrided by induction-heating in a nitrogen atmosphere with blowing nitrogen gas (GBIH-nitriding). The fatigue strength of the GBIH-nitrided Ti-6Al-4V alloy was lower than that of the mirror-polished specimen owing to the formation of a brittle nitrogen compound layer and grain coarsening. Fatigue tests using specimens prepared by combining GBIH-nitriding and particle collision treatments revealed that the formation of nitrogen diffusion layers at the outermost surface and the generation of compressive residual stress without forming surface asperities increased the fatigue strength of the GBIH-nitrided Ti-6Al-4V alloy. Moreover, the formation of a nitrided layer and suppression of surface asperities effectively improved the wear resistance of the Ti-6Al-4V alloy. Therefore, formation of a nitrogen diffusion layer and the introduction of compressive residual stress without grain coarsening, a compound layer, and surface asperities increased the fatigue strength and wear resistance of the GBIH-nitrided alloy.
- Access to Document (DOI)
Rapid carburizing of low-alloy steel by atmospheric-controlled induction-heating fine-particle peening and investigation of its fatigue properties

Takesue S., Kasai D., Aoki T., Tsukahara M., Misaka Y., Komotori J.

Journal of Materials Research and Technology 33 2244 - 2251 2024

ISSN 22387854

　View Summary

Atmospheric-controlled induction-heating fine-particle peening (AIH-FPP) was applied to low-alloy, low-carbon steel AISI 4120 to achieve rapid carburizing within minutes and enhance fatigue strength. The shot particles used during AIH-FPP were specifically created by mechanically milling a mixture of steel particles and carbon powders. The specimens were analyzed using laser microscopy, optical microscopy, X-ray diffraction for residual stress measurement, a micro-Vickers hardness tester, and an electron probe micro-analyzer. Axial fatigue tests and fracture surface analyses via scanning electron microscopy and energy-dispersive X-ray spectroscopy were also conducted. AIH-FPP effectively transferred carbon to the treated surface and facilitated its diffusion in a short period, creating a martensite layer with high hardness and compressive residual stress, which resulted in increased fatigue strength. The fatigue strength of the AIH-FPP-treated specimens was influenced by the conditions of reheating and quenching, which altered the prior austenitic grain size and stress concentration at the specimen surface. Notably, specimens treated with AIH-FPP followed by reheating and water-injection quenching exhibited fatigue strength comparable to that of conventional gas-carburized specimens, owing to the formation of a carburized layer with a small prior austenite grain size.
- Access to Document (DOI)

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Papers, etc., Registered in KOARA 【 Display / hide 】

Development of oriented cell sheet production process using metallic dish

Komotori, Jun

学事振興資金研究成果実績報告書 (慶應義塾大学) 2022
Stem cell maturation using a dish-type metal cell incubator

Komotori, Jun

福澤諭吉記念慶應義塾学事振興基金事業報告集 (福澤基金運営委員会) 2021
Stem cell maturation using a dish-type metal cell incubator

Komotori, Jun

福澤諭吉記念慶應義塾学事振興基金事業報告集 (福澤基金運営委員会) 2020
Surface modification of structural steel by high temperature fine particle peening

Komotori, Jun

科学研究費補助金研究成果報告書 2017
Jisso technologies for micro-nano medical devices

Komotori, Jun

科学研究費補助金研究成果報告書 2017

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Reviews, Commentaries, etc. 【 Display / hide 】

レーザ誘起湿式改質法により形成したステンレス鋼表面層のトライボロジー特性

江面篤志，片平和俊，小茂鳥潤

トライボロジスト 168 ( 1 ) 36 - 41 2023.01
レーザ誘起湿式表面改質法によるチタン合金の生体適合性向上

江面篤志，片平和俊，小茂鳥潤

砥粒加工学会誌 64 ( 12 ) 606 - 609 2020.12

Article, review, commentary, editorial, etc. (scientific journal)
窒素雰囲気下での高周波誘導加熱によるチタン合金の極短時間窒化

武末翔吾，塚原真宏，三阪佳孝，小茂鳥潤

熱処理 60 ( 6 ) 233 - 238 2020.12

Article, review, commentary, editorial, etc. (scientific journal)
高周波誘導加熱を利用したチタン合金の超短時間窒化処理

武末翔吾，小茂鳥潤

チタン 68 ( 2 ) 148 - 152 2020.04
レーザ誘起湿式表面改質処理によるバイオマテリアルの高機能化

[1] 江面篤志，片平和俊，小茂鳥潤

材料の科学と工学 57 ( 5 ) 168 - 171 2020

Article, review, commentary, editorial, etc. (scientific journal)

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Research Projects of Competitive Funds, etc. 【 Display / hide 】

Development of super rapid nitriding process for titanium alloys

2016.04

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2018.03

MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Challenging Exploratory Research, Principal investigator
Surface modification of structural steel by high temperature fine particle peening

2015.04

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2018.03

MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Principal investigator

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Intellectual Property Rights, etc. 【 Display / hide 】

チタン材の表面窒化処理方法

Date applied：特願201680026872.2 2017.11

Patent, Joint
チタン材の表面窒化処理方法

Date applied：特願10-2017-7031496 2017.10

Date announced：特開10-2017-0131686 2017.11

Patent, Joint
チタン材の表面窒化処理方法

Date applied：特願15/569988 2017.10

Date issued：米国特許10487387 2019.11

Patent, Joint
チタン材の表面窒化処理方法

Date applied： PCT/JP2016/063250 2016.04

Date announced： WO2016/181847 2016.11

Patent, Joint
表面処理装置及び表面処理方法

Date applied：特願2016-064579 2016.03

Date announced：特開2016-117953 2016.04

Date issued：特許第6118931号 2017.03

Patent, Joint

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Awards 【 Display / hide 】

論文賞

S. Takesue， M. Hayama， J. Komotori, 2024.05, 日本材料学会疲労部門委員会, Effect of atmospheric-controlled induction-heating fine particle peening on microstructure and fatigue properties of low-alloy steel
論文賞

M．Hayama, S. Kikuchi, M. Tsukahara, Y. Misaka, J.Komotori,, 2024.05, 日本材料学会疲労部門委員会, Estimation of residual stress relaxation in low alloy steel with different hardness during fatigue by in situ X-ray measurement

Type of Award： Award from Japanese society, conference, symposium, etc.
日本材料学会関東支部功労賞

2019.05, 日本材料学会

Type of Award： Award from Japanese society, conference, symposium, etc.
工作機械技術振興賞（論文賞）

水谷正義，本多遼，村上諒，益子直人，小茂鳥潤，厨川常元, 2016.06, 公益財団法人　工作機械技術振興財団, 純チタンへのナノ秒パルスレーザ照射による生体活性表面の創成

Type of Award： Award from publisher, newspaper, foundation, etc.
砥粒加工学会賞論文賞

水谷正義,村上諒,益子直人,小茂鳥潤,本多遼,厨川常元, 2016.03, 公益社団法人　砥粒加工学会, 純チタンへのナノ秒パルスレーザ照射による生体活性表面の創成

Type of Award： Award from Japanese society, conference, symposium, etc.