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Abstract
This work presents information about the influence of Ni and ZnFe galvanic metallization on the fatigue properties of S235JRG2 steel and about the TiN physical vapour deposition and WC thermal spraying on the fatigue properties of S355J0 steel in the ultra-high-cycle region of loading (N 6106 - 1010 cycles) obtained at high-frequency fatigue testing (f 20 kHz, T 20 3 °C, R 1). Technical coatings are used in order to modify the properties of the surface that is being covered for protection against corrosion but also in order to increase the hardness and resistance to wear. The Ni coating produced by galvanic metallization favourably influences the corrosion resistance but it introduces tensile stresses into the surface layer which act negatively on fatigue properties. No evidence of improving fatigue lifetime was detected in the case of ZnFe, TiN and WC coatings. In all types of coating the fatigue cracks were initiated on the specimen surface e.g. on the coatings surfaces.
Highlights
Fatigue limit is one of the most important criteria determining the quality of components and structures
The aim of this study is to reveal the influence of Ni and ZnFe coatings deposited by galvanic metallization on the fatigue behaviour of S235JRG2 steel and influence of TiN coating deposited by Physical vapor deposition (PVD) process and WC coating deposited by Thermal Spraying (THSP) process on the fatigue behaviour of S355J0 steel
Three different types of coating fractures were observed in the case of steel with Ni coating
Summary
Fatigue limit is one of the most important criteria determining the quality of components and structures. The ultra-high-cycle region of loading (107 Ͻ Nf Ͻ 1010 cycles) has been investigated intensively by several research teams. The aim of these experimental studies is to increase the fatigue limit, safety and reliability of components and structures [3]. The fact that fatigue fractures occur after more than Nf Ͻ 107 cycles of loading motivates the researches to use experimental methods working with a high frequency cyclic loading (f Ϸ 20 kHz) [3, 4]
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