Development of Water Jet Peening Technique for Reactor Internals of Nuclear Power Plant

Saitou, Noboru; Enomoto, Kunio; Kurosawa, Kouichi; Tanaka, Masaaki; Morinaka, Ren; Yoshikubo, Fujio; Ishikawa, Tetsuya; Yano, Hiroyuki

doi:10.1299/jsmezairiki.2004.0_205

Cited by 17 publications

(19 citation statements)

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“…Peening is a technique used to improve the fatigue strength and the stress corrosion cracking resistance of metal parts, due to work hardening and plastic deformation of the surface layer by strong tapping of the material surface. Water jet peening (WJP) [1] [2] [3] [4] [5] is a peening method that utilizes the cavitation phenomenon, and it is applied for preventive maintenance [2] in nuclear power plants. It is possible to reduce the tensile residual stress generated in a structure by welding or machining.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrasonic Irradiation Conditions on Metal Surface during Multifunction Cavitation

Ijiri¹,

Yoshimura²

2018

MSA

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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 reforming 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.

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Section: Introductionmentioning

confidence: 99%

Effect of Ultrasonic Irradiation Conditions on Metal Surface during Multifunction Cavitation

Ijiri¹,

Yoshimura²

2018

MSA

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“…When WJC is applied to a welded part where tensile residual stress exists or a surface finished by surface grinding, the tensile residual stress on the surface is reduced and a compressive residual stress is produced. As a result, fatigue strength [2] and stress corrosion cracking resistance [3] are improved. Other than WJC technology, there are vibration cavitation called UC and laser induced cavitation.…”

Section: Introductionmentioning

confidence: 99%

Steel Processed by Water Jet Cavitation with Ultrasonic Irradiation

Ijiri¹,

Nakagawa²,

Tanaka³

et al. 2018

Proceedings of the 10th International Symposium on Cavitation (CAV2018)

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Alloy steels for machine structural is used for industrial equipment. However, the operating environment is often harsh, requiring the development and application of various surface treatments. The authors focus on the use of water jet cavitation (WJC) with ultrasonication. WJC technology enables the generation of high pressure during cavitation collapse near the surface when a water jet ejected from a nozzle impacts a metal surface. This pressure causes a slight deformation in the impacted surface region and introduces a compressive residual stress due to the elastic constraints of the underlying and surrounding metal. If ultrasonic irradiation is applied to WJC bubbles with diameters of several hundred microns, the bubbles are subjected to alternating high and low sound pressures, which leads to a high-pressure and high-temperature reaction field. This technique is referred to as multifunction cavitation (MFC). The authors have reported several characteristics of specimens processed by MFC to date. For example, titanium oxide powder, which is widely used as a photocatalyst, can be fabricated in the form of nanoparticles by MFC. In addition, the indium tin oxide (ITO) film deposited on the transparent electrode mounted on liquid crystal displays can be melted by MFC treatment, leading to the release of indium, which has a low melting point. In present study, the compressive residual stress and corrosion resistance of Cr-Mo and Ni-Cr-Mo steels were improved by MFC treatment. Moreover, the authors compared conventional WJC technology to MFC technology. MFC was found to lead to higher compression residual stresses and higher corrosion resistances compared to conventional WJC. The corrosion resistance was revealed by the formation of an oxide film through selective oxidation and the concomitant reduction of surface defects. The oxide coating formed by a reaction between the dissolved oxygen in water with Cr on the metal surface during processing.

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“…To solve this problem, the development of surface treatments and their practical application are required. As one method, the authors had a particular focus on the use of water jet peening (WJP) [1] [2] [3]. In the WJP process, high pressure occurs when a cavitation caused by high pressure water jetted from a nozzle collapses on the metal surface.…”

Section: Introductionmentioning

confidence: 99%

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

Ijiri¹,

Shimonishi²,

Nakagawa³

et al. 2017

MSA

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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.

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Development of Water Jet Peening Technique for Reactor Internals of Nuclear Power Plant

Cited by 17 publications

References 0 publications

Effect of Ultrasonic Irradiation Conditions on Metal Surface during Multifunction Cavitation

Effect of Ultrasonic Irradiation Conditions on Metal Surface during Multifunction Cavitation

Steel Processed by Water Jet Cavitation with Ultrasonic Irradiation

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

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