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Effect of multifunction cavitation using phosphoric acid on fatigue and surface properties of AZ31 magnesium alloy

镁合金学报(英文) 2023年第6期11卷 1996-2005页

作者： Shunta Matsuoka Fumihiro Kato Toshihiko Yoshimura masataka ijiri Shoichi Kikuchi Graduate School of Integrated Science and Technology Shizuoka University3-5-1 JohokuNaka-kuHamamatsuShizuoka432-8561Japan Department of Mechanical Engineering Sanyo-Onoda City University1-1-1 Daigaku-DoriSanyo-OnodaYamaguchi 756-0884Japan Tokyo Metropolitan University 1-1 Minami-OsawaHachiojiTokyo 192-0397Japan Department of Mechanical Engineering Faculty of EngineeringShizuoka University3-5-1 JohokuNaka-kuHamamatsu-shiShizuoka 432-8561Japan

Magnesium alloy is attractive for lightweight construction but often suffers from poor corrosion resistance and low *** processing with chemicals,i.e.,multifunction cavitation(MFC),was introduced to form a high-corrosion film and improve the fatigue properties of an AZ31 magnesium *** analysis and plane bending fatigue tests were conducted for the MFC-treated magnesium alloy at a stress ratio,R,*** mechanical action of cavitation bubbles improved the fatigue life of magnesium alloys due to increasing the surface hardness and generating compressive residual ***,the combined mechanical and electrochemical action during MFC formed pits on the *** pits were large enough to easily nucleate an initial fatigue *** addition,the magnesium alloys without pit formation,for which a coating process using phosphoric acid was conducted after MFC using water,showed superior fatigue properties.

关键词： Magnesium alloy Multifunction cavitation Surface modification Fatigue Residual stress

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Effect of Ultrasonic Irradiation Conditions on Metal Surface during Multifunction Cavitation

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Materials Sciences and Applications 2018年第8期9卷 698-704页

作者： masataka ijiri Toshihiko Yoshimura Sanyo-Onoda City University Sanyo-Onoda Japan

Processing using multifunction cavitation (MFC) has recently enabled functional characteristics to be imparted to various materials. It is possible to process a material surface in the same manner as with conventional water jet (WJ) peening;however, the cavitation bubble temperature is different. To further improve this MFC technology, we examine the surface re-forming of low alloy steel (JIS-SCM435) using MFC with various modes of ultrasonic waves. The ultrasonic equipment used for MFC processing includes dual, single, pulse and frequency modulation (FM) ultrasonic modes. Improvement of the residual stress and corrosion resistance was confirmed for all modes. The dual mode showed the maximum values of residual compressive stress and surface potential. The sound pressure at the machining spot was the highest with dual mode, and the temperature in the bubble generated by the WJ nozzle was highest and the amount of dissolved oxygen was lowest. Improvement of the residual stress and corrosion resistance was promoted because the temperature and pressure in the bubble interior during processing was higher than in the other modes.

关键词： Multifunction Cavitation Residual Stress Corrosion Resistance Ultrasonic Water Jet Peening

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Evolution of Microstructure from the Surface to the Interior of Cr-Mo Steel by Water Jet Peening

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Materials Sciences and Applications 2017年第10期8卷 708-715页

作者： masataka ijiri Daichi Shimonishi Daisuke Nakagawa Toshihiko Yoshimura Tokyo University of Science Yamaguchi Japan

The microstructure and hardness on and below the surface of Cr-Mo steel (SCM435) treated by water jet peening (WJP) were investigated using scanning electron microscopy and micro Vickers hardness measurements. The change of the surface residual stress caused by the WJP treatment influenced the surface microstructure and surface hardness of the SCM435 steel. Cementite in the pearlite phase tended to protrude as the duration of WJP was increased. Voids were formed in the area 0.5 - 1.0 mm below the surface and also at grain boundaries between ferrite and pearlite grains, whereas no voids were formed in the depth range from 2.0 to 3.0 mm below the surface.

关键词： Water Jet Peening Cr-Mo Steel Surface Reforming Microstructure Voids

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Surface Modification of Ni-Cr-Mo Steel by Multifunction Cavitation

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材料科学与工程（中英文A版） 2017年第6期7卷 290-296页

作者： masataka ijiri Daichi Shimonishi Daisuke Nakagawa Kumiko Tanaka Toshihiko Yoshimura Tokyo University of Science Yamaguchi 1-1-1 Daigaku-Dori Sanyo-Onoda Yamaguchi 756-0084 Japan

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