Impact of Impulse Shot Peening Parameters on Properties of Stainless Steel Surface

• Authors: M. Wiertel , K. Zaleski , M. Gorgol , A. Skoczylas , R. Zaleski
• Languages of publication: EN

Abstracts

EN

Shot peening was applied to austenitic stainless steel 1.4541 (EN). The surface treatment was performed at various impact energies E, impact densities j and ball diameters D. This resulted in improved microhardness, which increases monotonically with the increase of E, j and 1/D. However, its changes with E and j achieve saturation at about 400 HV0.1. On the contrary, no saturation is observed in the investigated range for 1/D. In the un-shot peened 1.4541 (EN) steel, the lifetime component of low intensity was found with use of positron annihilation lifetime spectroscopy (PALS). It corresponds to positron annihilation from delocalized state of positrons in bulk. In the shot peened samples the bulk component is no longer observed. Instead, two types of defects can be identified: vacancy-like defects coupled with edge dislocations and vacancies or their small clusters (consisting 3÷5 vacancies). The results of PALS and hardness testing do not correspond very well, especially in the case of the samples shot peened with balls of varying diameters. The most probable reason for this are different depth profiles of both methods. It seems that the defects, which are responsible for the increase of static microhardness above 400 HV0.1 are located mostly below the surface layer penetrated by positrons.

Keywords

EN

81.65.-b; 81.20.Wk; 62.20.Qp; 61.72.-y; 78.70.Bj

Discipline

• 62.20.Qp: Friction, tribology, and hardness(see also 46.55.+d Tribology and mechanical contacts in continuum mechanics of solids; for materials treatment effects on friction related properties, see 81.40.Pq)
• 81.65.-b: Surface treatments(for surface preparation and lithography in microelectronics, see 85.40.-e)
• 61.72.-y: Defects and impurities in crystals; microstructure(for radiation induced defects, see 61.80.-x; for defects in surfaces, interfaces, and thin films, see 68.35.Dv and 68.55.Ln; see also 85.40.Ry Impurity doping, diffusion, and ion implantation technology; for effects of crystal defects and doping on superconducting transition temperature, see 74.62.Dh)
• 78.70.Bj: Positron annihilation(for positron states, see 71.60.+z in electronic structure of bulk materials; for positronium chemistry, see 82.30.Gg in physical chemistry and chemical physics)
• 81.20.Wk: Machining, milling

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 132
• Issue: 5
• Pages: 1611-1615

Dates

published

2017-11

Contributors

author

M. Wiertel

• Maria Curie-Skłodowska University, Institute of Physics, Department of Nuclear Methods, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

author

K. Zaleski

• Faculty of Mechanical Engineering, Lublin University of Technology, Nadbystrzycka 36, 20-618 Lublin, Poland

author

M. Gorgol

• Maria Curie-Skłodowska University, Institute of Physics, Department of Nuclear Methods, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

author

A. Skoczylas

• Faculty of Mechanical Engineering, Lublin University of Technology, Nadbystrzycka 36, 20-618 Lublin, Poland

author

R. Zaleski

• Maria Curie-Skłodowska University, Institute of Physics, Department of Nuclear Methods, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

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Identifiers

DOI

10.12693/APhysPolA.132.1611