|Marta Homa, Zenon Pirowski, Patrycja Turalska, Adam Bitka, Krzysztof Jaśkowiec
This paper presents the results of complex investigations into the thermophysical properties of 30MCDB64-M and 30NSCDV86-M cast steel, including temperature conductivity, thermal conductivity, specific heat, thermal expansion and the change of density in the function of temperature. Measurements of temperature conductivity were performed using Laser Flash Analysis (LFA) in the temperature range 25-1000°C. Calorimetric investigations at temperatures from 25°C to 1300°C were performed by Differential Scanning Calorimetry (DSC), while changes in thermal expansion, thermal expansion coefficient and the measurement of density change in the temperature function were determined by the dilatometric method (DIL) in the temperature range from 25°C to 900°C. Changes in thermal conductivity in the temperature function were determined using mathematical algorithms of the Netzsch LFA Analysis 4.8.5 software.
Keywords: cast steel resistant to abrasion, thermophysical properties, transformation temperatures, melting heat, thermal expansion, thermal expansion coefficient, thermal conductivity,
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Ewa Jankowska, Kamil Frączek, Karol Kopciuch
This paper presents the results of an examination of cast-on-strap joints of lead acid batteries with different discharge capacities. The galvanic joints of lugs of selected cells in lead acid batteries were analyzed. The study showed some defects that may occur in these joints. Examples of the defects that can affect battery lifespan were presented.
Keywords: lead acid cell, electric parameters, capacities, cast-on-strap, joints,
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Viktoriya Boyko, Edward Czekaj, Małgorzata Warmuzek, Kostiantyn Mykhalenkov
The designing of new light-weight alloys for continuous replacement of cast iron and steel parts is now the mainstream regarding energy saving and improvement of fuel consumption in the transportation sector. Parallel with the remarkable advances in aluminium wrought alloys, the search for novel efficient casting alloys still attracts the attention of researchers and manufacturers of aluminium casting. The last decades have shown a growing interest in Al-Mg-Si-Mn casting alloys. Despite their active implementation into foundry practice, there is a lack of research regarding their structural formation after additional alloying by Cu, Zn, Sc, Zr, Ti, Li, and especially the effect of ‘natural hardening’ when an alloy undergoes aging from as-cast condition. In this paper the authors have summarised the existing information on the Al-Mg-Si-Mn casting alloys, including their structure and the effects of Mn, Cu, Zn, Sc, Sc+Zr and Li additions on the properties, along with their own results concerning this group of casting materials.
Keywords: aluminium alloys, casting, Al-Mg-Si system, alloying addition, precipitation,
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