Effect of combined shot peening and ultrasonic nanocrystal surface modification processes on the fatigue performance of AISI 304

Amanov, Auezhan; Karimbaev, Ruslan; Maleki, Erfan; Ünal, Okan; Pyun, Young Sik; Amanov, Tileubay

doi:10.1016/j.surfcoat.2018.11.100

Cited by 101 publications

(32 citation statements)

References 48 publications

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“…Numerous studies have been performed using limited conditions among UNSM process. The reported effects of UNSM on the mechanical properties and microstructure can be summarized as follows [22,23,24,25,26]: (i) The microstructure of the surface and under surface is converted to a nanograined microstructure which enhanced yield strength, tensile strength, and hardness as a result of the Hall–Pitch strengthening mechanism. (ii) Very high levels of compressive residual stresses were formed (about (1–2 GPa).…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Static Load in the UNSM Process on the Corrosion Properties of Alloy 600

Kim

2019

Materials

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To suppress stress corrosion-cracking, compressive residual stresses, such as shot peening, laser peening, water jet peening, ultrasonic peening, and ultrasonic nanocrystal surface modification (UNSM) are utilized. However, among the numerous techniques, there is little research about the corrosion effect of detailed conditions, such as static load or amplitude in UNSM. A study on UNSM among various techniques of adding compressive residual stress to Alloy 600 was conducted. The focus of this study was on the effect of the static load in UNSM on the corrosion properties of Alloy 600. Microstructure analysis was conducted using an optical microscope (OM), a scanning electron microscope (SEM), and electron backscattering diffraction (EBSD), while compressive residual stress was measured using a nano-indentation technique. A cyclic polarization test and the AC (Alternating Current)-impedance measurement were both used to analyze the corrosion properties. An increase in static load under critical static load enhanced the grain boundary diffusion, consequently strengthened the passive film, and facilitated the surface diffusion, thereby improving the passivation of Alloy 600. However, higher static loads over the critical value can lead to an increase in the friction between the striking tip and the surface, thereby creating an overlapped wave, which reduces the corrosion properties.

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Section: Introductionmentioning

confidence: 99%

The Effect of the Static Load in the UNSM Process on the Corrosion Properties of Alloy 600

Kim

2019

Materials

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“…It is demonstrated that the parameter combinations without static load are enough to generate nanograins in the surface of the TLM titanium alloy. It is introduced that the dynamic load of ultrasonic strikes is about two times that of static load [23], severe plastic deformation layers are usually shown with rheological trend. However, the legible strain flow was not observed because static load was not introduced here.…”

Section: Observation Of the Severe Plastic Deformation Layermentioning

confidence: 99%

“…It is reported that the tensile stress of 316 L stainless steel is increased by about 13%, while the yield strength increases from 280 MPa to 550 MPa after SMAT. The reason is the phase transformation of martensite [23]. Elastic modulus E is a parameter which concerns the cohesion of atoms.…”

Section: Fatigue Characteristicsmentioning

confidence: 99%

Effect of Ultrasonic Surface Impact on the Fatigue Properties of Ti3Zr2Sn3Mo25Nb

Cheng

Cao

et al. 2020

Materials

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The effect of nano grain surface layer generated by ultrasonic impact on the fatigue behaviors of a titanium alloy Ti3Zr2Sn3Mo25Nb (TLM) was investigated. Three vibration strike-numbers of 24,000 times, 36,000 times and 48,000 times per unit are chosen to treat the surface of TLM specimens. Nanocrystals with an average size of 30 nm are generated. The dislocation motion plays an important role in the transformation of nanograins. Ultrasonic surface impact improves the mechanical properties of TLM, such as hardness, surface residual stress, tensile strength and fatigue strength. More vibration strike numbers will cause a higher enhancement. With a vibration strike number of 48,000 times per square millimeter the rotating-bending fatigue strength of TLM at 107 cycles is improved by 23.7%. All the fatigue cracks initiate from the surface of untreated specimens, while inner cracks appear after the fatigue life of 106 cycles with the ultrasonic surface impact. The crystal slip in the crack initiation zone is the main way of growth for microcracks. Crack cores are usually formed at the junction of crystals. The stress intensity factor of TLM titanium alloy is approximately 7.0 MPa·m1/2.

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“…Both the single and double layers were first polished and then subsequently treated by UNSM treatment. Details of UNSM treatment can be found in our previous studies [23,24].…”

Section: Unsm Treatmentmentioning

confidence: 99%

Mechanical and Tribological Characteristics of Cladded AISI 1045 Carbon Steel

et al. 2020

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This study introduces a newly developed cladding device, through printing AISI 1045 carbon steel as single and double layers onto American Society for Testing and Materials (ASTM) H13 tool steel plate. In this study, the mechanical and tribological characteristics of single and double layers were experimentally investigated. Both layers were polished first and then subjected to ultrasonic nanocrystal surface modification (UNSM) treatment to improve the mechanical and tribological characteristics. Surface roughness, surface hardness and depth profile measurements, and X-ray diffraction (XRD) analysis of the polished and UNSM-treated layers were carried out. After tribological tests, the wear tracks of both layers were characterized by scanning electron microscopy (SEM) along with energy-dispersive X-ray spectroscopy (EDX). The surface roughness (Ra and Rz) of the single and double UNSM-treated layers was reduced 74.6% and 85.9% compared to those of both the as-received layers, respectively. In addition, the surface hardness of the single and double layers was dramatically increased, by approximately 23.6% and 23.4% after UNSM treatment, respectively. There was no significant reduction in friction coefficient of both the UNSM-treated layers, but the wear resistance of the single and double UNSM-treated layers was enhanced by approximately 9.4% and 19.3% compared to the single and double polished layers, respectively. It can be concluded that UNSM treatment was capable of improving the mechanical and tribological characteristics of both layers. The newly developed cladding device can be used as an alternative additive manufacturing (AM) method, but efforts and upgrades need to progress in order to increase the productivity of the device and also improve the quality of the layers.

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Effect of combined shot peening and ultrasonic nanocrystal surface modification processes on the fatigue performance of AISI 304

Cited by 101 publications

References 48 publications

The Effect of the Static Load in the UNSM Process on the Corrosion Properties of Alloy 600

The Effect of the Static Load in the UNSM Process on the Corrosion Properties of Alloy 600

Effect of Ultrasonic Surface Impact on the Fatigue Properties of Ti3Zr2Sn3Mo25Nb

Mechanical and Tribological Characteristics of Cladded AISI 1045 Carbon Steel

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