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1
Content available Influence of Shot Peening on the Wear Behaviour of Medium Carbon Steel
Vicen Martin, Bokůvka Otakar, Trško Libor, Drbul Mário, Nikolić Ružica, Nový František
Production Engineering Archives
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2022
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Vol. 28, Iss. 3
241--245
EN
Influence of shot peening on the wear behaviour of medium carbon, C55 steel was experimentally verified. Experimental work included determination of the chemical composition, heat treatment, microstructure evaluation, mechanical properties measurement, shot peening treatment, the magnitude of the compressive residual stresses was evaluated, roughness profiles measurement and finally the friction tests. The results evidence the significant role played by the applied shot peening on wear behaviour of medium carbon steel. An important effect of surface roughness has been demonstrated. The coefficient of friction after shot peening compared to ground surface increased, 1.44 – 1.85 times.
2
Content available Selection of the optimal paper-forming sieve obtained by the plasma welding
Bojić Nada, Nikolić Ružica, Hadzima Branislav
Quality Production Improvement - QPI
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2020
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Vol. 2, Iss. 1
221--228
EN
The paper-forming sieve is the most important part of the paper production machine. Reliability of the machine as a whole depends on the sieve's quality. An analysis of the two constructions of the paper forming sieves, which were obtained by the plasma welding of the sieve's wires, is presented in this paper. The mechanical characteristics of the two sieves, made of wires of diameters 0.15 mm and 0.20 mm, were tested, namely the tensile strength and elongation. The tests have shown that the sieve made of the wire of the smaller diameter has the better mechanical properties. This sieve is also better from the aspect of the water removal in the press section of the paper machine.
3
Content available Tribological behavior of low-alloyed steel after nitriding
Vicen Martin, Bokůvka Otakar, Nikolić Ružica, Bronček Jozef
Production Engineering Archives
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2020
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Vol. 26, Iss. 3
78--83
EN
The tribological properties of the nitride layer applied to the low-alloyed steel were investigated in this research. Experimental work included determination if the chemical composition, wear resistance, Rockwell, Vickers and nano-indentation tests, both of the substrate material – the low-alloyed steel and the deposited nitride layer. From the results obtained in those experiments authors concluded that applying the nitride layer does not significantly improve the tribological properties of the tested lowalloyed steel samples, thus this process is not recommended for achieving that purpose.
4
Content available Influence of the welding joint type on safety properties of the armor steel ARMOX 500t
Lazić Vukić, Arsić Dušan, Nikolić Ružica, Uhričik Milan, Hadzima Branislav
System Safety : Human - Technical Facility - Environment
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2019
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Vol. 1, nr 1
753--759
EN
Steels of the ARMOX class belong into a group of the fine-grained, increased strength steels, which are manufactured by the quenching and low tempering procedure, with intensive thermo-mechanical treatment at high temperatures. Combination of the heat and mechanical treatments provides for the fine grains and exceptionally good properties of these steels, while the low-tempering enables relatively high hardness and good ballistic properties. This is why the welding of these steels can negatively affect the material properties in individual zones of the welded joint, what could lead to worsening of the material's ballistic properties, as well. The model plates were welded with the specially prescribed technology; the joints were the but-joint, corner joint and the joint with the shielding plate. In this paper are presented results obtained from the ballistic tests of the plates welded by the prescribed technology; tests consisted of shooting with three types of live ammunition at different types of the welded joints.
5
Content available Conformity of finished forming sieves for paper industry
Nada Bojić, Nikolić Ružica, Manojlović Goran
Production Engineering Archives
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2019
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Vol. 24
29--32
EN
The sieves' manufacturers that want to be competitive at the market must have the implemented quality control system. Different methods, based on taking the sample, which is a representative of the total quantity of the forming sieves production, are applied for evaluation of the sieve's conformity. The basic characteristics of this type of the quality function are control, measuring and testing of the forming sieves' properties at the end of the manufacturing process. The objective is to detect and separate the products that deviate from the set criteria, to remain in the factory, then to be repaired if possible or discarded in the opposite case and thus to prevent delivery of the defective sieves to the paper manufacturers.
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