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Konyukhov A.D.,Railway Research Institute JSC | Drits A.M.,Alcoa | Shurtakov A.K.,Railway Research Institute JSC
Tsvetnye Metally | Year: 2014

There were defined the mechanical properties and corrosion resistance in fertilizers of welds, made of 1565ch M (1565?) aluminum alloy sheets of Al-Mg-system. There was established that the yield strength and ultimate resistance of 1565ch M alloy is higher than the yield strength and ultimate resistance of the commonly used AMg6 alloy at the equal elongation. The properties of 1565ch M alloy under static, shock and cyclic loading conditions were determined for the welds, produced in three ways (argon arc welding, plasma welding, TIG welding). A preferred technology for butt welds making is TIG welding, whereby the toughness of welds is 2-3 times higher than the toughness of welds, produced from the same alloy by fusion welding. Restricted endurance limit of welds was defined on the basis of 107 cycles. The restricted endurance limit is 70 MPa for weld, produced by argon arc welding without weld reinforcement removing. According to this, removing endurance strength was increased to 100 MPa after weld reinforcement. Restricted endurance limit at TIG welding is 128 MPa. It is shown that corrosion resistance of the alloy and its 1565ch welds in fertilizers are about 20 times higher than this characteristic of the 10KhNDP steel, used in the freight cars' plates. Body assembly technology, using TIG welding, can compete with freight cars' body assembly, using HUCK components (lockbold technology), adopted in North America. Use of aluminum alloys in the construction of the freight cars' bodies, combined with increased axial loading, can increase their capacity by 35-40 tons and reduce costs for corrosion protection of internal surface of car bodies during grain and fertilizers shipment. © Designed by: "Ore and Metals" Publishing House, journal "Tsvetnye Metally", 2013. Source


Kotova E.G.,Railway Research Institute JSC | Mironov A.E.,Railway Research Institute JSC | Gershman I.S.,Railway Research Institute JSC
Tsvetnye Metally | Year: 2013

The analysis of the microstructure and mechanical properties for experimental alloys of Al-Cu-Zn-Sn-Pb and Al-Si-Cu-Sn-Pb systems has been performed on the samples, which were obtained by casting in cast iron molds. The polythermal layers of Al-Sn-Cu, Al-Pb-Sn, and Al-Si-Sn-Pb-Cu diagrams have been built, analyzed and their phase composition were calculated using the software package Thermo-Calc. It was shown that for Al-7% Sn-Cu-alloys at room temperature Sn and ? (CuAl2) are in equilibrium with the solid solution of aluminum, in Al-Pb-Sn-alloys in the temperature range of 230-200 ?C and 1% Pb and up to 0,06% Sn content (Pb) is in equilibrium with (Al), with increase of the concentration of Sn from 0,06% to 0,17% (Al), (Sn) and (Pb) are in solid-state equilibrium, in the area of the concentration of tin more then 0,17% (Sn) is in equilibrium with (Al), Al-Si-Sn-Pb-Cu-alloys have a region of immiscibility in the liquid state. Metallographic analysis has been investigated with the aids of optical microscopy and scanning electron microscopy. According to the microstructural analysis in Al-Cu-Sn-Pb-alloys CuAl2, (Sn) and (Pb) are situated along the boundaries of the dendritic cells of the solid solution (Al); the main phase components of the experimental Al-Si-Cu-Sn-Pb-alloys are (Al), (Si), (Sn) and (Pb). The hot-tearing tendency of the experimental alloys has been evaluated by I. I. Novikov method. The tension tests have been realized at the room temperature. The Brinell-hardness and toughness have been determined. The experimental results have been analyzed and referred to the microstructural analysis. Based on this research, the most advanced alloys have been selected for further usage of them like antifriction alloys. Key words: aluminum alloys, antifriction alloys, tin, lead, copper, silicon, microstructure, phase composition, mechanical properties. Source

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