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1
Content available Fatigue strength improvement of the AISI 316Ti austenitic stainless steel by shot peening
100%
Novy F. , Dundekova S. , Bokuvka O. , Trsko L.
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tom Vol. 4, No. 3
2--6
EN
Stainless steels are structural materials used for a wide range of applications. One of the fields of application of these highly corrosion resistant materials is for various medical applications. Different methods of mechanical property improvement have been studied in recent years to increase the durability of components manufactured from these materials. The main goal of this study was an analysis of fatigue strength improvement of the AISI 316Ti austenitic stainless steel by shot peening. A significant improvement of surface hardness, yield strength and fatigue limit by shot peening was observed in this study. This is despite increasing the surface roughness which usually degrades material’s fatigue strength.
2
Wpływ obróbki cieplno-chemicznej w zlożu fluidalnym na strukturę i wlasciwosci warstwy wierzchniej stali narzędziowej utwardzonej laserowo
100%
Jasiński J. , Ulewicz R. , Selejdak J. , Novy F.
Inżynieria Materiałowa
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2005
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tom Vol. 26, nr 5
357-359
PL
W pacy określono strukturę warstwy wierzchniej stali NC11L V po hartowaniu laserowym. Badaniu została poddana stal w stanie zmiękczonym oraz po fluidalnej obróbce cieplno chemicznej.
EN
This work presented the surface layer structure of steel NCI11L V after laser hardening process. The subject of experiment was steel NC11L V after soft annealing and thermo-chemical process in fluidized bed.
3
Content available Fractography analysis of Inconel 718 fatigued at 700°C
100%
Jambor M. , Belan J. , Bokuvka O. , Novy F.
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tom Vol. 13, No. 4
20--25
EN
This work deals with the fractography analysis of nickel-base superalloy Inconel 718 fatigued at 700°C in air atmosphere in the high cycle region. During cyclic loading of this alloy at high temperatures some different mechanisms compared to cyclic loading at ambient temperature take place. Cyclic plastic deformation at high temperatures causes some structural changes, which could have some influence.
4
Composite brake blocks in railway operation
100%
Hrinak J. , Reznicek R. , Novy F. , Kalincak D.
Logistyka
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2010
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tom nr 2
EN
This paper deals with description of operation behaviour and frictional properties composite brake blocks of railway brakes. Brief description of brake test bench at the University of Zilina is presented as well. There are presented results of the material analyses of chosen types of composite types of brake blocks with the aid of light microscope.
PL
Artykuł poświęcony jest opisowi własności eksploatacyjnych i właściwości ciernych kompozytowych klocków hamulcowych pojazdów szynowych. W pracy przedstawiono także skrótowy opis stanowiska do badań hamulców pojazdów szynowych funkcjonującego na Uniwersytecie w Żylinie (Słowacja). W pracy omówiono także wyniki badań materiałowych wybranych typów kompozytowych klocków hamulcowych, przeprowadzonych przy użyciu mikroskopu optycznego.
5
Content available Quality and fatigue characteristics relation
100%
Trsko L. , Bokuvka O. , Novy F. , Lago J.
Production Engineering Archives
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2016
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tom Vol. 10, No. 1
9--12
EN
This paper will explore the mutual correlation of fatigue characteristics ((Kath, σc, ac = f (Rm)) of five structural steels tested at high frequency loading based on tests (f ≈ 20 kHz, T = 20 ± 10 °C, R = -1). Different fatigue resistance parameters have different meanings and misunderstanding can lead to significant quality problems in component operation. Consequently, it is necessary to completely understand the relation between the two most important fatigue characteristics which are fatigue limit σc and the threshold value of the stress intensity factor amplitude Kath and how they act with changing of steel ultimate tensile strength.
6
Content available remote Influence of loading type on the shape of fatigue lifetime curve
100%
Bokuvka O. , Novy F. , Mintach R. , Cincala M.
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tom Vol. 15, no 2
321-328
EN
The paper is devoted to an experimental examination of the influence of loading type on the shape of fatigue lifetime curve of the high-carbon-chromium bearing steel (100Cr6). The push-pull and rotating bending loading tests (R=-1) were used with the aim to obtain experimental data in the region from [...] cycles to [...] cycles. The shape of fatigue lifetime curve of 100Cr6 bearing steel depends on the loading type. The S-N curve obtained using rotating bending consists of two parts corresponding to surface and subsurface fatigue crack initiation, resulting in a stepwise S-N curve. In this case, the typical stepwise S-N relationship clearly indicates that the mechanism of fatigue crack initiation transfers from the surface to subsurface with decreasing the applied stress level. On the other hand, the S-N curves obtained at push-pull loading revealed a continuous downward slope without any indication for a plateau region and subsurface fatigue crack initiation occurs in the whole range of amplitudes. This fact has to be taken in consideration while selecting a structural material.
7
Content available remote Effect of electrolytic plating and shot-peening on fatigue properties in the ultra-high cycle regime
100%
Ulewicz R. , Novy F. , Bojanowicz P.
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tom Vol. 15, no 2
563-570
EN
This work presents information about the influence of shot-peening, nickel and chromium galvanic metallization on the fatigue properties of S235JRG2 steel in the ultra-high-cycle region of loading […] obtained at high-frequency fatigue testing […]. Shot-peening is a technological process during which the surface layer is exposed to plastic deformation which is caused by high speed shooting using small metallic or ceramic particles. Galvanic metallization by nickel deposition is one of the most thorough processes of surface finish and has many applications, mostly decorative-protective and technical ones. Technical coatings are used in order to modify the proprieties of the surface that is being covered for protection against corrosion but also in order to increase the hardness and resistance to wear. The coatings produced by galvanic metallization increase corrosion resistance but in doing so, they introduce tensile stresses into the surface layer which act negatively on fatigue proprieties. Nickel is employed for the production of final coatings or it can be used for the production of inter-layers in chrome galvanic metallization.
8
Content available Phase Transformations in Nickel base Superalloy Inconel 718 during Cyclic Loading at High Temperature
88%
Jambor M. , Bokuvka O. , Novy F. , Trsko L. , Belan J.
Production Engineering Archives
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2017
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tom Vol. 15
15--18
EN
Nickel base superalloys are hi-tech materials intended for high temperature applications. This property owns a complex microstructure formed by matrix of Ni and variety of precipitates. The type, form and the amount of these phases significantly affect the resulting properties of these alloys. At sufficiently long exposure to high temperatures, the transformation phase can occur, which can lead to degradation of properties of these alloys. A cyclic plastic deformation can accelerate these changes, and they could occur at significantly lower temperatures or in shorter time of exposure. The aim of this study is to describe phase transformation, which can occur by a cyclic plastic deformation at high temperatures in nickel base superalloy Inconel 718.
9
Content available Influence of long-term heating on the fatigue properties of low-alloyed cast steel STN 42 2707
88%
Bokuvka O. , Jambor M. , Novy F. , Trsko L. , Lago J.
Production Engineering Archives
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2016
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tom Vol. 12, No. 3
30--33
EN
In this paper the authors publish own experimental results of examination of low-alloyed cast steel STN 42 2707 fatigue properties (near- threshold regime of fatigue crack propagation for rates from da/dN =5.6x10-9m.cycle-1 to da/dN =10-12 m.cycle-1 and Kath at da/dN =10-12 m.cycle-1) initial state and after long-term heating (T = 400 °C, t = 4000 hours ≈ 167 days) obtained at high-frequency loading (f ≈ 20 kHz, T= 20 ± 5 °C, R = -1). The long-term heating of material caused decrease of Kath and increase of fatigue crack growth rate in the near-threshold regime; then worse of low-alloyed cast steel STN 42 2707 fatigue properties.
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