Processing of magnesium alloy by energy-intensive multifunction cavitation in a strong magnetic field with laser light excitation and associated sonoluminescence

Yoshimura, Toshihiko; Noda, Tomoya; Ijiri, Masataka

doi:10.1016/j.rinma.2023.100391

Cited by 4 publications

(8 citation statements)

References 12 publications

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“…A magnetic field was obtained by incorporating a total of 34 highly powerful neodymium permanent magnets (NS167, Sangyo Supply Co., Ltd., 20 mm × 7 mm × 20 mm) into the apparatus Yoshimura et al (2022b), Yoshimura et al (2023b). These were installed both inside and outside the upper water tank containing the ultrasonic transducer, near the nozzle outlet.…”

Section: Methodsmentioning

confidence: 99%

“…In addition, ultrasonic radiation was applied using a pentagonal geometry to prevent the radiation sources from directly facing one another (as occurs in the EI-MFC device) and to avoid sound pressure interference or cancellation Yoshimura et al (2021a). The 72 neodymium magnets were arranged in a heptagonal geometry based on previous work using the MEI-MFC Yoshimura et al (2022b) and LMEI-MFC techniques Yoshimura et al (2023b). As a result of this arrangement, a strong magnetic field of more than 10 mT was present in the region between the WJ nozzle exit and the cavitation cloud.…”

Section: Methodsmentioning

confidence: 99%

“…A new metal processing technique referred to as laser-assisted EI-MFC (LMEI-MFC) was also demonstrated in prior studies Yoshimura et al (2021b), Yoshimura et al (2022b). This system combines an MFC system with irradiation by laser light in conjunction with the application of a strong magnetic field to promote multiphoton ionization within bubbles Yoshimura (2023a), Yoshimura et al (2023b).…”

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

Precise Peening of Ni-Cr-Mo Steel by Energy-Intensive Multifunction Cavitation in Conjunction With Positron Irradiation

Yoshimura,

Yamamoto,

Watanabe

2024

Int. J. Eng. Sci. Tech

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The peening characteristics of Ni-Cr-Mo steel were investigated using energy-intensive multifunction cavitation using positron irradiation (PMEI-MFC). It was found that PMEI-MFC in a high magnetic field, multifunction cavitation in a high magnetic field (MEI-MFC), laser irradiation ultrasonic cavitation (LMEI-UC), and a combination of positron and laser irradiation ultrasonic cavitation in a high magnetic field (PLMEI-UC) could reduce the surface roughness of unprocessed metal specimens by approximately one-fourth. Furthermore, the PMEI-MFC method greatly improved the residual stress at the metal surface by up to 1155 MPa. Each of these technologies was found to increase the surface hardness although the PLM-WJC and PMEI-MFC processes, which generated high temperatures, produced smaller increases than were obtained using the LMEI-MFC technique. This difference is attributed to recrystallization, which eliminated work hardening at the outermost metal surface during processing using positrons. The data also indicate that the PMEI-MFC method was able to both smooth and flatten the metal surface. This research demonstrates an approach to precision peening that can reduce surface roughness while imparting high compressive residual stress.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Precise Peening of Ni-Cr-Mo Steel by Energy-Intensive Multifunction Cavitation in Conjunction With Positron Irradiation

Yoshimura,

Yamamoto,

Watanabe

2024

Int. J. Eng. Sci. Tech

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“…Although an experimental approach was not possible in this study, the use of a combination of water jet, ultrasonic and magnetic field energy sources in conjunction with laser light has been shown to greatly increase the luminescence intensity obtained from this apparatus Yoshimura et al (2023). In addition, multiphoton ionization is induced by the laser irradiation and this effect is expected to increase the pressure associated with collisions between bubbles.…”

Section: Figurementioning

confidence: 96%

“…This previous research demonstrated the generation of ultra-hightemperature, ultra-high-pressure cavitation producing the required fusion temperature of 1.0 × 10 8 K Yoshimura et al (2021a), Yoshimura et al (2018a), Yoshimura et al (2018b), Yoshimura (2020. The author's group has also developed a laser assisted magnetic field energy intensive multifunction cavitation (LMEI-MFC) apparatus intended for surface modification of various materials Yoshimura et al (2023).…”

Section: Introductionmentioning

confidence: 99%

Cavitation Fusion by Energy-Intensive Multifunction Cavitation in a Strong Magnetic Field With Laser Light Excitation

Yoshimura

2023

Int. J. Eng. Sci. Tech

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This paper introduces an experimental apparatus capable of producing cavitation fusion based on laser-assisted high-magnetic-field energy-intensive multifunction cavitation. Combining water jet, ultrasonic and magnetic field energy sources has been shown to increase the luminescence intensity in this system such that the threshold required for deuterium-tritium fusion can be exceeded. The incorporation of a laser provides a further improvement in emission intensity based on an increase in the internal temperature of bubbles. Multiphoton excitation induced by the laser irradiation raises the pressure generated during collisions between bubbles. Consequently, the probability of achieving cavitation fusion is greatly enhanced.

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Estimating the fatigue limits for quenched and tempered steel rods treated with multifunction cavitation considering residual stress, hardness, and surface pits

Kikuchi,

Ono,

Yoshimura

et al. 2024

Fatigue Fract Eng Mat Struct

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In this study, multifunction cavitation (MFC) was performed on low‐alloy steel (AISI 4140 steel) rods with different hardnesses to increase their fatigue limit. It was found that a high compressive residual stress was generated on the surface of steel rods by MFC and that the magnitude of the compressive residual stress tended to increase with increasing specimen hardness, which resulted in a higher fatigue limit. However, fatigue cracks are known to be initiated from the pits and red rust that form on the surface during MFC treatment in water. Furthermore, relaxation of the compressive residual stress was also investigated during the fatigue test to elucidate the mechanism for improving the fatigue properties. The results showed that the fatigue limit for MFC‐treated steel rods was accurately estimated by considering residual stress relaxation, hardness, and pit formation. Validation of the fatigue limit estimation was also conducted through comparison with Murakami's equation.

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Processing of magnesium alloy by energy-intensive multifunction cavitation in a strong magnetic field with laser light excitation and associated sonoluminescence

Cited by 4 publications

References 12 publications

Precise Peening of Ni-Cr-Mo Steel by Energy-Intensive Multifunction Cavitation in Conjunction With Positron Irradiation

Precise Peening of Ni-Cr-Mo Steel by Energy-Intensive Multifunction Cavitation in Conjunction With Positron Irradiation

Cavitation Fusion by Energy-Intensive Multifunction Cavitation in a Strong Magnetic Field With Laser Light Excitation

Estimating the fatigue limits for quenched and tempered steel rods treated with multifunction cavitation considering residual stress, hardness, and surface pits

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