Improvement of corrosion resistance of low-alloy steels by resurfacing using multifunction cavitation in water

Ijiri, Masataka; Yoshimura, Toshihiko

doi:10.1088/1757-899x/307/1/012040

Cited by 11 publications

(16 citation statements)

References 3 publications

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“…We therefore considered that the C content gradually increased at the outermost surface without decarburization. An increase in water temperature during WJP processing has been reported previously [ 10 , 12 , 13 ], whereas an increase in surface temperature has not.…”

Section: Resultsmentioning

confidence: 67%

“…This product was considered to be rust in a previous report [ 11 ]. With respect to the occurrence of rust, it is considered have speculated that extensive rust is generated due to dissolved oxygen [ 10 , 12 , 14 ] generated during processing attaching to the surface. In addition, compared with the rust generation rate on the surface processed with MFC, that on the surface processed with WJP is lower.…”

Section: Resultsmentioning

confidence: 99%

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High-temperature corrosion behavior of high-temperature and high-pressure cavitation processed Cr–Mo steel surface

Ijiri

Ogi

Yoshimura

2020

Heliyon

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In this paper, long-term high-temperature corrosion at 500 °C and high-temperature corrosion at the melting temperature of a corrosive ash mixture were examined because the use of high-temperature equipment such as boilers and gas turbines increases year over year. To investigate the optimum cavitation processing conditions for the specimens used in high-temperature corrosion tests, the surface properties of each processed specimen were examined. In specimens processed using multifunction cavitation (MFC), the compressive residual stress was high when the processing time was 10 min and the Cr content on the surface was greater than on the surface of an unprocessed specimen. On the other hands, in specimens subjected to water-jet peening (WJP), the compressive residual stress was high when the processing time was 10 min. In the present study, the processing time was selected to be 10 min and all high-temperature corrosion tests were conducted by the coating method. In the case of long-term high-temperature corrosion at 500 °C, the corrosion loss of the MFC-processed and WJP-processed specimens was small, whereas the corrosion loss of the unprocessed specimen was large.

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Section: Resultsmentioning

confidence: 67%

Section: Resultsmentioning

confidence: 99%

High-temperature corrosion behavior of high-temperature and high-pressure cavitation processed Cr–Mo steel surface

Ijiri

Ogi

Yoshimura

2020

Heliyon

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“…The sound pressure was measured The oxide film formed on the specimen surface after each MFC process was measured using KFM to confirm the increase of the specimen surface temperature, as shown in Table 3. KFM detects the displacement of a cantilever due to an electrostatic attractive force on the specimen surface; therefore, it is possible to obtain the work function difference (contact potential difference) between the an oxide film is likely to be formed on the specimen surface [10].…”

Section: Methodsmentioning

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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“…MFC can be used like WJP to reform a material surface. Improvements in residual stress, strength, and corrosion resistance have been reported for Ni-Cr-Mo steel [8], Cr-Mo steel [9,10], and Al alloy [11] processed using MFC. It has been shown that the corrosion resistance of the surface of Cr-Mo steel and the improvement in residual stress are affected by the period [12] and ultrasonic wave output [13] for specimens processed with MFC.…”

Section: Introductionmentioning

confidence: 99%

Thermal Stress Relaxation and High-Temperature Corrosion of Cr-Mo Steel Processed Using Multifunction Cavitation

et al. 2018

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This research investigated high-temperature corrosion (500 °C) of Cr-Mo steel processed using water jet peening or multifunction cavitation (MFC), and the suitability of such steel for high-temperature boilers and reaction vessels. High-temperature corrosion was induced using an embedment test and a coating test using sulfide-type K2SO4-Na2SO4 powder. To measure the relaxation of the residual stress due to the decrease in work hardening caused by an increase in specimen temperature and the difference in thermal shrinkage between the surface and interior of the specimen, a thermal cycling test was conducted. For the MFC-processed specimen, the oxide film that formed on the surface suppressed mass loss, prevented crack formation, and reduced the compressive residual stress caused by high-temperature corrosion. MFC-processed Cr-Mo steel is thus suitable for a high-temperature corrosion environment.

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Improvement of corrosion resistance of low-alloy steels by resurfacing using multifunction cavitation in water

Cited by 11 publications

References 3 publications

High-temperature corrosion behavior of high-temperature and high-pressure cavitation processed Cr–Mo steel surface

High-temperature corrosion behavior of high-temperature and high-pressure cavitation processed Cr–Mo steel surface

Effect of Ultrasonic Irradiation Conditions on Metal Surface during Multifunction Cavitation

Thermal Stress Relaxation and High-Temperature Corrosion of Cr-Mo Steel Processed Using Multifunction Cavitation

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