Investigation of residual stresses in steel plates after shot-impact treatment by high spatial resolution neutron diffraction

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Abstract

Using high-spatial-resolution (~0.2 mm) neutron diffraction, we examined the residual stresses in structural alloyed steel (Cr, Si, Mn) plates, 5 mm in thickness, following shot peening. The analysis revealed that residual stresses form not only near the treated surface but throughout the entire thickness of the plate. Compressive stress zones appear near both treated and untreated surfaces, while tensile stress zones emerge in the middle region. The intensity of the shot peening affects the width of these zones and the magnitude of the maximum stresses. Neutron experiments were conducted to measure stresses near the treated surface of the plates, employing the sin2ψ method. Results obtained via the sin2ψ neutron method were consistent with those from traditional three-component strain measurement techniques. The sin2ψ neutron method proves to be advantageous for measuring stresses near the surfaces of thick samples, since it lacks the limitations of traditional measurement techniques on the thickness of the sample.

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About the authors

I. D. Karpov

National Research Center “Kurchatov Institute”

Email: vtem9@mail.ru
Russian Federation, Moscow

V. T. Em

National Research Center “Kurchatov Institute”

Author for correspondence.
Email: vtem9@mail.ru
Russian Federation, Moscow

E. P. Nikolaeva

Irkutsk National Research Technical University

Email: vtem9@mail.ru
Russian Federation, Irkutsk

I. V. Sergeichev

Skolkovo Institute of Science and Technology, Center for Materials Technologies

Email: vtem9@mail.ru
Russian Federation, Moscow

B. S. Voloskov

Skolkovo Institute of Science and Technology, Center for Materials Technologies

Email: vtem9@mail.ru
Russian Federation, Moscow

P. Mikula

Nuclear Physics Institute CAS

Email: vtem9@mail.ru
Czech Republic, Řež

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Supplementary files

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2. Fig. 1. Position of the test volume (TV) for: (a) complete and (b) partial immersion in the sample material.

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3. Fig. 2. Sample diagram and main directions: X — longitudinal (Length), Y — transverse (Transverse), Z — normal (North). Dimensions are given in millimetres.

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4. Fig. 3. Scheme of a collimator with a 0.2 mm slit.

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5. Fig. 4. Strains and stresses at the measurement point (x, y, z) in the sample coordinate system (X, Y, Z): εxx, εyy, εzz are strains in the X, Y, Z directions; σxx, σyy, σzz are stresses in the X, Y, Z directions; φ, ѱ are direction angles; εφψ is strain in the direction specified by angles φ, ѱ; σφψ is stress in the direction specified by angles φ, ѱ; εφ is strain in the direction specified by angle φ at ѱ = 90°; σφ is stress in the direction specified by angle φ at ѱ = 90°; (0, 0, 0) is the origin of the coordinate system (X, Y, Z).

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6. Fig. 5. Dependence on depth for plates 1 and 2: position of the diffraction peak in the VSD (1a, 2a); intensity of the diffraction peak (1b, 2b); residual stresses (1c, 2c).

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7. Fig. 6. Results of determining the transverse component of stresses at a depth of 0.15–0.4 mm in Plate 2 using the sin2ψ method at seven (σ7) and eight (σ8) angles ψ (the eighth angle ψ = 90°) at a depth of 0.15 mm (a), 0.2 mm (b), 0.3 mm (c), 0.4 mm (d).

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8. Fig. 7. Results of determining the longitudinal component of stresses in Plate 2 using the sin2ψ method at seven (σ7) and eight (σ8) angles ψ (the eighth angle ψ8 = 90°) at a depth of 0.15 mm (a) and 0.2 mm (b).

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9. Fig. 8. Results of measuring the transverse component of stresses by the sin2ψ method at seven (σ7) angles ψ using slits 0.5 mm wide (PO = 0.5×0.5×17 mm3) at a depth of: 0.5 mm (a), 0.75 mm (b), 1 mm (c). σ3comp — stress values ​​obtained by measuring three strain components.

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