Effect of shot peening time on δ/γ residual stress profiles of AISI 304 weld

Lai, Hsuan-Han; Cheng, Hao-Chung; Lee, Chen‐Yu; Lin, Chi-Ming; Wu, Weite

doi:10.1016/j.jmatprotec.2020.116747

Cited by 17 publications

(6 citation statements)

References 30 publications

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“…However, the significant differences in CRS were SCRS related to the plastic deformation of peened surface, the MCRS, the MCRSD and the CRSLD (Figure 5(c,d)). In general, the increase in shots velocity or the extension of peening time are conducive to improving the plastic deformation [36,37], thereby promoting the rise of the SCRS. Therefore, the CSP treatment resulted in more pronounced SCRS due to higher shot velocity.…”

Section: Resultsmentioning

confidence: 99%

Residual stress and microhardness evolution induced by conventional and ultrasonic shot peening

Zhang

et al. 2022

Materials Science and Technology

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Very limited comparative research has been conducted on microstructure evolution induced by different peening methods. Herein, the 2024T351 aluminium alloy was subjected to conventional shot peening (CSP) and ultrasonic shot peening (USP) under the identical Almen height to investigate the differences in surface roughness, residual stress and microhardness. The results demonstrated that under the same Almen height, the CSP treatment resulted in a rougher surface with higher surface roughness and more surface defects, and higher surface and maximum compressive residual stress (CRS) than the USP treatment. In contrast, the CRS depth was relatively lower for the CSP treated samples. In addition, the USP treatment produced more significant microhardness and hardened layer than the CSP treatment.

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Section: Resultsmentioning

confidence: 99%

Residual stress and microhardness evolution induced by conventional and ultrasonic shot peening

Zhang

et al. 2022

Materials Science and Technology

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“…The FWHM is defined as the amplitude of the peak at the average height of its intensity, and its measurement is given in degrees 55 . A change of the FWHM could be used to predict the surface coverage of the SP process 36 . In the same way, a decrease in peak intensity is associated with an increase in residual compressive stresses on the surface 36 .…”

Section: Discussionmentioning

confidence: 99%

“…A change of the FWHM could be used to predict the surface coverage of the SP process 36 . In the same way, a decrease in peak intensity is associated with an increase in residual compressive stresses on the surface 36 . The aforementioned coincides with that observed in the XRD graph of the present study, where an increase in FWHM is observed in the sample submitted to SP.…”

Section: Discussionmentioning

confidence: 99%

Shot peening increases resistance to cyclic fatigue fracture of endodontic files

Nino-Barrera

Sanchez-Aleman

Acosta-Humánez

et al. 2021

Sci Rep

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The objective of this study was to assess the resistance to fatigue fracture of conventional nickel–titanium files after undergoing shot peening. Forty NITIFLEX endodontic files, number 30, were divided into two groups; one was submitted to shot peening treatment and the other was not. All instruments were tested for fatigue fracture in simulated canals with a TRI-AUTO ZX endodontic motor. One file of each group was subjected to a residual stress analysis by XRD. Finally, the fractured surface was observed and elemental analysis performed by means of SEM and EDX. Roughness analysis was made by focal variation microscope. The shot peening group showed greater resistance to fatigue fracture; there was no difference in the length of the fractured fragments. XRD results showed the presence of residual compression stresses in the file submitted to shot peening, a decrease in the interplanar spacing, and an increase in the full-width-at-half-maximum and the microstrains. SEM and EDX showed a ductile fracture with zones of fatigue and an equiatomic ratio between the nickel and titanium. Surface roughness increased after the file was subjected to the shot peening procedure. In conclusion, shot peening increases the resistance to fatigue fracture due to the presence of residual compression stresses in files manufactured from a conventional nickel–titanium alloy.

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“…Therefore, the MCRS of USPed samples were less than that of the SPed sample. Among the USPed samples, the larger MCRS of the USP2 specimen was ascribed to more plastic deformation induced by the longer processing duration [20,43]. Generally speaking, the increase of the balls will cause a more significant plastic deformation zone, which corresponds to deeper CRSL.…”

Section: Residual Stressmentioning

confidence: 95%

Microstructure change and corrosion resistance of selective laser melted Ti-6Al-4V alloy subjected to pneumatic shot peening and ultrasonic shot peening

Zhang

Wang³

et al. 2022

Surf. Topogr.: Metrol. Prop.

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Titanium alloys fabricated by selective laser melting (SLM) are typically subjected to post-treatments, such as shot peening, to improve the mechanical properties. However, the same Almen intensity may correspond to various combinations of peening parameters, which will generate different microstructures and comprehensive properties. Herein, the SLMed Ti64 alloy was treated by pneumatic shot peening (SP) and ultrasonic shot peening (USP) under the same Almen intensity of 0.2 mmA, investigating the changes of the microstructure and corrosion resistance. The average surface roughness (Ra) of the SPed sample was 1.806 μm，which was significantly higher than those of the USPed samples (0.942 μm and 0.999 μm). The USP and SP treatments led to the surface plastic deformation and grain refinement, while the SP produced a smaller crystallite size. The SP treatment led to the biggest surface and max compressive residual stress, which were -654.0 MPa and -805.5 MPa, but the USP resulted in thicker compressive residual stress layers. The USPed sample reached the highest microhardness (443.2 HV0.025) and the thickest hardened layer (247.8 μm). The USP and SP samples offered superior corrosion resistance, but the USPed samples showed higher corrosion potentials and lower corrosion current densities.

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Effect of shot peening time on δ/γ residual stress profiles of AISI 304 weld

Cited by 17 publications

References 30 publications

Residual stress and microhardness evolution induced by conventional and ultrasonic shot peening

Residual stress and microhardness evolution induced by conventional and ultrasonic shot peening

Shot peening increases resistance to cyclic fatigue fracture of endodontic files

Microstructure change and corrosion resistance of selective laser melted Ti-6Al-4V alloy subjected to pneumatic shot peening and ultrasonic shot peening

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