The effects of ultrasonic nanocrystal surface modification temperature on the mechanical properties and fretting wear resistance of Inconel 690 alloy

Amanov, Auezhan; Umarov, Rakhmatjon

doi:10.1016/j.apsusc.2018.01.293

Cited by 88 publications

(26 citation statements)

References 52 publications

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“…In addition, there are many rings in the corresponding selected area electron diffraction pattern ( Fig. 7(b)), indicating the presence of nano-grains [13,22]. Furthermore, the lamellar grains consisted of nanostrctured subgrains, as presented in the enlarged image of grains ( Fig.…”

Section: Resultsmentioning

confidence: 90%

“…Surface enhancement treatments combined with ultrasonic technology have been developed in recent decades. Ultrasonic nanocrystal surface modification has been applied to the plasma-nitrited S45C steel [10], quenching and tempering S45C steel [11], 40Cr steel [12], Inconel 690 alloy [13], as well as normal and heat-treated 60kgK rail steel [14]. During the ultrasonic nanocrystal surface modification processes, the material surface is struck as force was applied by a hard ball up to tens of thousands of times per second, leading to a severe plastic deformation in the surface and subsurface of materials.…”

Section: Introductionmentioning

confidence: 99%

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The influence of ultrasonic surface rolling on the fatigue and wear properties of 23-8N engine valve steel

Lai

Lewis

et al. 2019

International Journal of Fatigue

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Section: Resultsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

The influence of ultrasonic surface rolling on the fatigue and wear properties of 23-8N engine valve steel

Lai

Lewis

et al. 2019

International Journal of Fatigue

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“…At HT, the specimens were heated up with a halogen-based high-temperature heating system, where the actual temperature was measured using a portable pyrometer. More detailed information about the UNSM technique, including high-temperature heating setting of LHT, can be found in our previous publications [ 26 , 27 ]. Following the UNSM treatment, both of the disk specimens were mounted in bakelite and were polished with sand papers down to 2400 grit, and then a colloidal solution was used with a powder of 1 µm in diameter to achieve a mirror-like surface.…”

Section: Methodsmentioning

confidence: 99%

“…However, the hardness can be continuously increased with temperature, where a softening may occur as well. For example, a softening occurred in Ni-based superalloy (Inconel 690 alloy) when the high-temperature UNSM treatment was performed at 700 °C [ 27 ]. Moreover, the highest hardness of α-Ta treated by high-temperature UNSM treatment was found at 800 °C [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Gradient Nanostructured Tantalum by Thermal-Mechanical Ultrasonic Impact Energy

2018

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Microstructural evolution and wear performance of Tantalum (Ta) treated by ultrasonic nanocrystalline surface modification (UNSM) at 25 and 1000 °C were reported. The UNSM treatment modified a surface along with subsurface layer with a thickness in the range of 20 to 150 µm, which depends on the UNSM treatment temperature, via the surface severe plastic deformation (S2PD) method. The cross-sectional microstructure of the specimens was observed by electron backscattered diffraction (EBSD) in order to confirm the microstructural alteration in terms of effective depth and refined grain size. The surface hardness measurement results, including depth profile, revealed that the hardness of the UNSM-treated specimens at both temperatures was increased in comparison with those of the untreated ones. The increase in UNSM treatment temperature led to a further increase in hardness. Moreover, both the UNSM-treated specimens with an increased hardness resulted in a higher resistance to wear in comparison with those of the untreated ones under dry conditions. The increase in hardness and induced compressive residual stress that depend on the formation of severe plastically deformed layer with the refined nano-grains are responsible for the enhancement in wear resistance. The findings of this study may be implemented in response to various industries that are related to strength improvement and wear enhancement issues of Ta.

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“…6,7 Not surprisingly, most results indicate that wear coefficient presents to be disperse, which not only affected by the material itself but also the service conditions. [8][9][10] Another challenge with wear depth evaluation is that it is hard to compute the work rate that depends on dynamic characteristics of SG tubes under multiphase fluid. 11 Therefore, it is difficult to evaluate the accurate wear depth on wear mechanism during the operation of nuclear power plants.…”

Section: Introductionmentioning

confidence: 99%

Markov stochastic process modeling for evolution of wear depth in steam generator tubes

Wei

et al. 2019

Advances in Mechanical Engineering

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Reliability of steam generator is a serious concern in the operation of nuclear power plants, especially for steam generator tubes that experience a variety of degradation mechanisms including wear damage. It is necessary to develop a model to accurately predict wear depth of tubes for the assessment and management of steam generator aging. In this article, a non-homogeneous Markov process model of wear is proposed to assess the evaluation of wear depth in steam generator tubes. Based on the analytical solutions of the system of Kolmogorov's forward equations, the transition probability functions are computed to estimate the future wear depth distribution. The parameters are estimated under the assumption that the mean wear depths in the proposed Markov stochastic model are equal to the average of measured depths. The time evolution of wear depth distribution can be predicted. The proposed Markov stochastic model was tested with the in-service inspection records from steam generator tube inspection report, and the results showed a good agreement with future wear depth distribution.

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The effects of ultrasonic nanocrystal surface modification temperature on the mechanical properties and fretting wear resistance of Inconel 690 alloy

Cited by 88 publications

References 52 publications

The influence of ultrasonic surface rolling on the fatigue and wear properties of 23-8N engine valve steel

The influence of ultrasonic surface rolling on the fatigue and wear properties of 23-8N engine valve steel

Gradient Nanostructured Tantalum by Thermal-Mechanical Ultrasonic Impact Energy

Markov stochastic process modeling for evolution of wear depth in steam generator tubes

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