Bending fatigue life enhancement of NiTi alloy by pre-strain warm surface mechanical attrition treatment

Ren, Fuzeng; Hua, Peng; Xia, Minglu; Yan, Kai; Lin, Hongyang; Yi, Shenghui; Lü, Jian; Ren, Fuzeng; Sun, Qingping

doi:10.1016/j.actamat.2022.118269

Cited by 22 publications

(8 citation statements)

References 59 publications

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“…Besides, the maximum value is approximately 368 MPa for SP, which is 530 MPa for SR, a 44% increase compared to SP. In view that the compressive stress will course an inhibitory impact on fatigue failure, 38,39 the SR process can better improve the fatigue performance than the SP.…”

Section: Resultsmentioning

confidence: 99%

A study of shot peening and spinning rolling on fatigue of Al 7075 alloy samples

Guan,

Zhang,

Gong

et al. 2024

Fatigue Fract Eng Mat Struct

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Surface mechanical strengthening is an effective way to improve the fatigue performance, among which surface rolling has been vastly utilized for its significant enhancement in fatigue strength. However, traditional rolling process is only suitable for components with rotational symmetry, limiting its application. Herein, a newly developed technology named “spinning rolling (SR)” was developed to strengthen the surfaces of platy components. A common Al alloy, 7075, was selected for verifying the effect. It is found that compared with the most popular technology, shot peening (SP), SR can provide deeper and higher residual stress, lower surface roughness, and comparable hardening layer, and consequently, significantly higher fatigue lives. Accordingly, there is a transition in the fatigue crack source from point‐like to line‐like, confirming a strong crack propagation resistance along depth direction. This study indicates the advantages of the SR technology, providing a greater resistance against fatigue damage of platy components.

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Section: Resultsmentioning

confidence: 99%

A study of shot peening and spinning rolling on fatigue of Al 7075 alloy samples

Guan,

Zhang,

Gong

et al. 2024

Fatigue Fract Eng Mat Struct

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“…Past studies have proven that surface nanocrystallization (SNC) is the most effective and promising method, which induces severe plastic deformation (SPD) on the surface of metallic materials [6,7],providing a very effective potential approach for achieving microstructure refinement and enhancing the overall properties of TC4 titanium alloy. Currently, surface nanocrystallization techniques such as laser shock peening (LSP) [8][9][10], surface mechanical attrition treatment (SMAT) [11][12][13], surface mechanical rolling treatment (SMRT) [14][15][16], equal-channel angular pressing (ECAP) [17][18][19] and ultrasonic shot peening (USP) [20] are widely used to achieve grain refinement and the surface integrity enhancement of materials, aiming to improve the fatigue resistance and wear resistance of titanium alloys during service. Li et al [21] investigated the strengthening effect of ultrasonic surface rolling at low temperatures, and demonstrated a significant enhancement of residual stress and wear properties at 120 • C. Liu et al [22] obtained an extremely strong surface nanocrystalline layer for Ti64 after laser-assisted ultrasonic nanocrystal surface modification (LA-UNSM), showing a 75.2% increase in hardness.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution and Numerical Modeling of TC4 Titanium Alloy during Ultrasonic Shot Peening Process

Yi,

Yin,

Zhai

et al. 2024

Metals

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Ultrasonic shot peening (USP) is a surface treatment technology used in the mechanical properties strengthening of the engineering material and components during manufacturing. TC4 titanium alloy is a commonly used engineering material in the aerospace industry. In this study, a gradient nanostructured surface layer was successfully fabricated on the TC4 titanium alloy via USP technology at room temperature. The microstructure evolution of TC4 titanium alloy during USP was investigated. The surface microhardness was elevated from 330 HV to 438 HV with a penetrating depth of around 900 μm after USP with the duration of 8 min. EBSD characterization results confirmed the presence of high-density grain boundaries within the gradient structure in the region of 0–200 μm, accompanied by proliferation of dislocation density. TEM characterization indicated a substantial amount of nanograin with an average size of 74.58 nm. Furthermore, the USP process was also investigated by the finite element method to evaluate the surface-strengthening effect. The calculated maximum residual stress reached 973 MPa after multi-ball impact. The impact behavior of the shots during the USP process was studied. The effect of the parameters on the USP strengthening intensity was explored based on the validated model. This work provided a clearer understanding of the USP strengthening process of TC4 titanium alloy through an effective method of evaluating the process parameters.

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“…In the processing of metal materials, the generation of residual stress is unavoidable, and concurrently, such stress can impair the operational efficiency of the material [23,24]. Therefore, it is of utmost significance to manage the residual stress within metal materials [25].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Electropulsing Treatment Technology for Flow Stress of Metal Material: A Review

Lu,

Tang,

et al. 2024

Alloys

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Residual stress is caused by non–uniform deformation caused by non–uniform force, heat and composition, which is of great significance in engineering applications. It is assumed that the residual stress is always the upper limit of the elastic limit, so the reduction of the flow stress will reduce the residual elastic stress. It is particularly important to control the flow stress in metal materials. Compared with traditional methods, the use of electropulsing treatment (EPT) technology stands out due to its energy–efficient, highly effective, straightforward and pollution–free characteristics. However, there are different opinions about the mechanism of reducing flow stress through EPT due to the conflation of the effects from pulsed currents. Herein, a clear correlation is identified between induced stress levels and the application of pulsed electrical current. It was found that the decrease in flow stress is positively correlated with the current density and the duration of electrical contact and current action time. We first systematically and comprehensively summarize the influence mechanisms of EPT on dislocations, phase, textures and recrystallization. An analysis of Joule heating, electron wind effect, and thermal–induced stress within metal frameworks under the influence of pulsed currents was conducted. And the distribution of electric, thermal and stress fields under EPT are discussed in detail based on a finite element simulation (FES). Finally, some new insights into the issues and challenges of flow stress drops caused by EPT are proposed, which is critically important for advancing related mechanism research and the revision of theories and models.

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Bending fatigue life enhancement of NiTi alloy by pre-strain warm surface mechanical attrition treatment

Cited by 22 publications

References 59 publications

A study of shot peening and spinning rolling on fatigue of Al 7075 alloy samples

A study of shot peening and spinning rolling on fatigue of Al 7075 alloy samples

Microstructure Evolution and Numerical Modeling of TC4 Titanium Alloy during Ultrasonic Shot Peening Process

Mechanism of Electropulsing Treatment Technology for Flow Stress of Metal Material: A Review

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