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1
Content available Obtaining of biomorphic composites based on carbon materials
Lisiecka B., Bokůvka O., Tański T., Krzemiński Ł., Jambor M.
Production Engineering Archives
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2018
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Vol. 19
22--25
EN
Aim of this paper is to present the properties of carbon preforms for the production of biomorphic composites. Carbon samples were obtained through pyrolysis of paulownia wood, replicating the microstructure of the cellulosic precursor. Many characterization methods such as Raman Spectroscopy, light microscopy, hardness tests and pore size analyzer detection were used to investigate the microstructure of the product as well as the pore size of carbon samples. Obtained results showed that the parts of early or late wood template play an important role in the pore size, specific surface area and pore volume of the product. This review aims to be a comprehensive description of the development of carbon chars: from wood templates and their microstructure to potential applications of biomorphic materials.
2
Content available Fatigue lifetime of 20MnV6 steel with holes manufactured by various methods
Bokůvka O., Jambor M., Trško L., Nový F., Lisiecka B.
Production Engineering Archives
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2018
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Vol. 19
3--5
EN
In this paper, the authors publish their own experimental results of the examination of the different holes (milled, drilled and drilled + shot peened) on the fatigue lifetime of 20MnV6 steel. The experiments were carried out at low-frequency loading (f = 10 Hz, pulsating tension loading) in the region from N = 2×105 up to N = 2×106 cycles. The best fatigue properties were obtained in the parts with drilled + shot peened holes.
3
Content available Phase Transformations in Nickel base Superalloy Inconel 718 during Cyclic Loading at High Temperature
Jambor M., Bokuvka O., Novy F., Trsko L., Belan J.
Production Engineering Archives
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2017
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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.
4
Content available Influence of long-term heating on the fatigue properties of low-alloyed cast steel STN 42 2707
Bokuvka O., Jambor M., Novy F., Trsko L., Lago J
Production Engineering Archives
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2016
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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.
5
Content available Fractography analysis of Inconel 718 fatigued at 700°C
Jambor M., Belan J., Bokuvka O., Novy F.
Production Engineering Archives
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2016
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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.
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