Positron Annihilation in Steel Burnished by Vibratory Shot Peening

Zaleski, R.; Zaleski, Kazimierz

doi:10.12693/aphyspola.110.739

Cited by 9 publications

(10 citation statements)

References 13 publications

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“…Its sensitivity to the size and concentration of defects predispose PALS for the study of shot-peened materials. It is confirmed by the results of our previous investigation that PALS is suitable to study the modifications of the steel surface layer [11,12].…”

Section: Introductionsupporting

confidence: 82%

Positron annihilation study of aluminum, titanium, and iron alloys surface after shot peening

Zaleski

Gorgol

et al. 2015

Appl. Phys. A

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Shot peening influence on alloys based on iron, aluminum, and titanium was studied using positron annihilation lifetime spectroscopy (PALS) and residual stress measurements. The PALS spectra were analyzed assuming two lifetime components. While the residual stresses change in a similar way in all the samples, the PALS results show an opposite tendency of a component relative intensities change with the time of shot peening for the Ti alloy as compared to steel or the Al alloy. A comparison between the depth profiles of positron implantation and the residual stress distribution reveals that the positron range covers a whole depth where residual stress is observed only in the Ti alloy. Based on this observation, the evolution of the defect concentration is presumed, consisting in migration of large defects away from the surface, while only smaller ones remain close to the surface. Furthermore, the positron lifetime distribution in the Al alloy was determined using the MELT program. The results showed that the initial single, wide distribution of lifetime splits into two narrower ones with increasing shot peening time.

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Section: Introductionsupporting

confidence: 82%

Positron annihilation study of aluminum, titanium, and iron alloys surface after shot peening

Zaleski

Gorgol

et al. 2015

Appl. Phys. A

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“…PAS can be used for identification and tracking of changes of crystal lattice defects, i.e., their generation during deformation or their annealing. These techniques have been successfully used for non-destructive evaluation of fatigue damage in SSs [31][32][33] and detection of the subsurface zone defects created by sliding, cutting [34,35], or shot peening [36]. PAS was applied to determine vacancy migration energy in SS [37,38].…”

Section: Introductionmentioning

confidence: 99%

Reverse transformation of deformation-induced martensite in austenitic stainless steel studied by positron annihilation

2014

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The reversion of deformation-induced a 0 -martensite in tension-deformed 1.4301 (EN) stainless steel was investigated using positron annihilation spectroscopy. The Doppler broadening of the annihilation line and positron lifetime spectroscopy were applied to study defect structure and its annealing behavior in samples with a similar deformation level but varying in a 0 -martensite amount. The difference in a 0 -martensite was obtained by applying different deformation temperatures, i.e., liquid nitrogen temperature, room temperature, and 200°C. The cumulative annealing of the tension-deformed samples and measurement of the positron annihilation characteristics show the gradual annealing of defects in the temperature range between 200 and 400°C due to the recovery and recrystallization. However, in the temperature range between 450 and 650°C, the generation of vacancy clusters which trap positrons is revealed. This temperature range coincides with the temperature range of a 0 -martensite reversion which is confirmed by microhardness and magnetization measurements. The detected large vacancy clusters consisting of 6-9 vacancies can occur at the interface between austenite and a 0 -martensite phases due to the volume contraction accompanying bcc/fcc change.

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“…The deformation is also accompanied by the continuation of compressive stresses in the surface layer, the value of which depends on the technological parameters of shot peening, such as the size and weight of the peening elements used, the frequency of the reciprocal progressive movement of the machining chamber, the amplitude of chamber vibrations and the time of shot peening of the machined parts [16,18]. Studies with the positron annihilation method confirmed that the increase of compressive residual stress is associated with an increase in vacancy clusters, as shown in [19]. The metal bearing beads are used as peening elements in the vibratory treatment, usually with the diameters from 2 to 10 mm.…”

Section: Introductionmentioning

confidence: 80%

The Numerical FEM Model of the Kinematics of the Vibratory Shot Peening Process

Bławucki

Zaleski

2017

Adv. Sci. Technol. Res. J.

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ABSTRACT:The paper presents the results of numerical calculations, with the finite element method in the ABAQUS program environment, of the vibratory shot peening process with loose peening elements. The behaviour of shot peening elements was analysed in the kinematic aspect. The impact of the initial deployment of vibratory shot peening elements on their behaviour during processing was investigated, including the displacement, velocity, acceleration and the number of collisions. The way of determining the effectiveness of the processing with the vibratory shot peening was illustrated.

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Positron Annihilation in Steel Burnished by Vibratory Shot Peening

Cited by 9 publications

References 13 publications

Positron annihilation study of aluminum, titanium, and iron alloys surface after shot peening

Positron annihilation study of aluminum, titanium, and iron alloys surface after shot peening

Reverse transformation of deformation-induced martensite in austenitic stainless steel studied by positron annihilation

The Numerical FEM Model of the Kinematics of the Vibratory Shot Peening Process

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