著作(論文等)

基本情報

氏名 吉村 敏彦
氏名(カナ) ヨシムラ トシヒコ
氏名(英語) YOSHIMURA Toshihiko

論文名

Development of energy intensive multifunction cavitation technology and its application to the surface modification of the Ni-based columnar crystal superalloy CM186LC

著者名

Toshihiko Yoshimura, Yuji Sugae, Takayuki Ogi, Fumihiro Kato, Masataka Ijiri

掲載誌名等

Heliyon

掲載年月

2021/12

7

12

開始頁

e08572

 

終了頁

11

出版者(日本語)

 

出版者(英語)

 

発表形態

Research paper

概要

The present work demonstrates a technique for the hot forging of metal surfaces in water at 1000 C or higher,
termed energy-intensive multifunctional cavitation (EI-MFC). In this process, the energy of cavitation bubbles is
maximized, following which these bubbles collide with the metal surface. This technique will be employed to
improve the surface structure of CM186LC/DS, a Ni-based columnar crystalline superalloy used to manufacture
the rotor blades of jet engines and gas turbines that are exposed to high-temperature oxidizing environments, with
the aim of improving creep strength. EI-MFC processing induces compressive residual stress in the metal that
prevents the occurrence of surface cracks and also increases surface hardness, improves corrosion resistance, and
increases the coefficient of friction. The latter effect can enhance the adhesion of thermal barrier coatings applied
to Ni-based superalloys by thermal spraying. The technology demonstrated herein can be applied to present-day
jet engine and gas turbine components and also to the production of hydrogen combustion turbines operating at
1700 C with higher combustion efficiency than the current 1500 C class gas turbines. In addition, the high
processing energy obtained using the EI-MFC technique has the potential to flatten rough surfaces resulting from
the stacking pitches of various metals manufactured using three-dimensional printers, and so improve surface
strength.