TEM evaluation of steel nanocrystalline surfaces obtained by severe shot peening

Peral, L.B.; Quintero, A.; Vielma, A.T.; Barbés, María Florentina; Fernández-Pariente, I.

doi:10.1016/j.surfcoat.2021.127238

Cited by 21 publications

(5 citation statements)

References 40 publications

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“…Although magnetic Barkhausen noise is affected by grain size, this factor can be considered less relevant in this research than the effect of microstructural and residual stresses changes. Both materials had similar grain sizes in the initial condition and the parameters used in the present shot peening treatment were of low intensity, which reduced the effect of grain refinement and, consequently, the relevance of this variable in the analysis 38 .…”

Section: Resultsmentioning

confidence: 99%

Effect of Shot Peening Treatment on Residual Stress and Magnetic Barkhausen Noise of AISI 201LN and AISI 304L Stainless Steels

et al. 2022

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This work evaluates microstructural changes and residual stresses on surface samples of AISI 201LN and 304L subjected to shot peening. The residual stresses were measured by Xray diffraction and magnetic Barkhausen noise (MBN) in different shot-peened conditions. The results showed that the 201LN steel presented more martensite than the 304L steel in the initial condition, but with lower δferrite contents. These ferromagnetic phases were present in a low amount with high tensile residual stresses due to brush cleaning and light coldrolling in the final stage of the fabrication process. The shot peening process promoted compressive residual stresses mainly in the δferrite. However, some "fresh" martensite exhibited tensile residual stress represented by higher and thinner peaks, which together with the low-intensity amplitude in the neighborhood, represented all formed martensite. Thus, small microstructural changes provoked high residual stresses behavior, which can be detected in ferromagnetic phases by MBN.

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Section: Resultsmentioning

confidence: 99%

Effect of Shot Peening Treatment on Residual Stress and Magnetic Barkhausen Noise of AISI 201LN and AISI 304L Stainless Steels

et al. 2022

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“…The high distortion deformation of ferrite promoted the nanocarbides precipitation. [ 32 ] Tsuchiya et al [ 33 ] revealed that nanocrystallization might occur at the highest strain level induced in successive stages. The introduction of EST can effectively reduce the stress level of parts, repair the material's micro defects, and promote the precipitation process of nanocarbides.…”

Section: Discussionmentioning

confidence: 99%

Microstructure Evolution and Wear Resistance Improvement of Ultrasonic Peened M50 Steel via Electromagnetic Shocking

Qian

Wang

Dong

et al. 2023

steel research int.

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Herein, the effect of electromagnetic shocking treatment (EST) on microstructure evolution and wear resistance of M50 steel treated by ultrasonic shot peening (USP) is investigated. The microstructure observation indicates that the EST promotes the precipitation of nanoscale carbides. The average grain size decreases slightly and the submicron grain layer increases after EST. The low‐angle grain boundaries generated by USP will transform into high‐angle grain boundaries, thereby refining the grains on the surface during EST. In addition, the surface hardness of USP‐M50 steel decreases slightly, accompanied by the reduction of surface residual stress after EST. The wear resistance results indicate that the wear loss of the EST specimens decreases by 15.7% comparedwith the specimens after USP. The improvement of wear resistance induced by EST is attributed to the increased fine precipitations. These precipitations hinder the grinding of abrasive particles into the matrix and connect with wear debris and oxide particles to form well consolidated self‐lubricating films to prevent wear losses. The refinement of surface structure is another important reason for the improvement of wear resistance.

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“…Moreover, with the continuous proceeding of the shot peening process, defects such as dislocation, twin stacking fault and shear band appear within the surface plastic deformation layer. Under the interaction of these defects, they are continuously annihilated and reorganized, and finally evolve into micro-nano scale cellular structures, subgrains and grains [74][75][76]. The formation process of microstructure refinement is shown in Figure 12.…”

Section: Microstructurementioning

confidence: 99%

Effects of the Shot Peening Process on Corrosion Resistance of Aluminum Alloy: A Review

et al. 2022

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The high humidity of marine atmosphere and the existence of corrosive chloride ions lead to the premature corrosion failure of aluminum alloy components. The development of surface-strengthening technology provides an opportunity to prolong their service life spans. As a mature surface-strengthening technology, the shot peening process is widely used, owing to its advantages over other strengthening technologies, including its easy operation and high production rate. The shot-peened surface integrity depends on shot peening variables that introduces the thermomechanical effect to the deformed surface layer. When the inappropriate shot peening parameters are adopted, the shot-peened surface integrity could be deteriorated, which further weakens the corrosion performance of the surface. Therefore, it is essential to optimize shot peening process variables with the consideration of the material and its application. In this paper, the strengthening mechanism of the shot peening process was firstly elaborated, and then the effects of process parameters on the surface integrity of aluminum alloy were reviewed. The relationship between the surface integrity and corrosion resistance was also revealed. Two directions, including the application of the surface temperature rise during the shot peening process and the shot-peened surface roughening, are proposed.

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TEM evaluation of steel nanocrystalline surfaces obtained by severe shot peening

Cited by 21 publications

References 40 publications

Effect of Shot Peening Treatment on Residual Stress and Magnetic Barkhausen Noise of AISI 201LN and AISI 304L Stainless Steels

Effect of Shot Peening Treatment on Residual Stress and Magnetic Barkhausen Noise of AISI 201LN and AISI 304L Stainless Steels

Microstructure Evolution and Wear Resistance Improvement of Ultrasonic Peened M50 Steel via Electromagnetic Shocking

Effects of the Shot Peening Process on Corrosion Resistance of Aluminum Alloy: A Review

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