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The Production of Material with Ultrafine Grain Structure in Al-Zn Alloy in the Process of Rapid Solidification

Szymanek M., Augustyn B., Kapinos D., Boczkal S., Nowak J.

Archives of Foundry Engineering

2014

Vol. 14, iss. 2

57--62

In the aluminium alloy family, Al-Zn materials with non-standard chemical composition containing Mg and Cu are a new group of alloys, mainly owing to their high strength properties. Proper choice of alloying elements, and of the method of molten metal treatment and casting enable further shaping of the properties. One of the modern methods to produce materials with submicron structure is a method of Rapid Solidification. The ribbon cast in a melt spinning device is an intermediate product for further plastic working. Using the technique of Rapid Solidification it is not possible to directly produce a solid structural material of the required shape and length. Therefore, the ribbon of an ultrafine grain or nanometric structure must be subjected to the operations of fragmentation, compaction, consolidation and hot extrusion. In this article the authors focussed their attention on the technological aspect of the above mentioned process and described successive stages of the fabrication of an AlZn9Mg2.5Cu1.8 alloy of ultrafinegra in structure designated for further plastic working, which enables making extruded rods or elements shaped by the die forging technology. Studies described in the article were performed under variable parameters determined experimentally in the course of the alloy manufacturing process, including casting by RS and subsequnt fragmentation.

Chromium and copper influence on the nodular cast iron with carbides microstructure

Gumienny G.

Archives of Foundry Engineering

2010

Vol. 10, iss. 4

47--54

In this paper chromium to 1,00% and copper to 1,50% influence at constant molybdenum content of about 1,50% on the nodular cast iron with carbides microstructure has been presented. It was found, that as a result of synergic addition of above-mentioned elements there is the possibility obtaining an ausferrite in nodular cast iron with carbides castings. Conditions have been given, when in nodular cast iron with carbides at cooling at first in the form, then air-cooling austenite transformation to upper bainite, its mixture with lower bainite, martensite or ausferrite takes place. Transformations proceed during cooling and the crystallization of cast iron have been determined and the casting hardness has been presented.

Ability of the CuSn10 and CuSn5Zn5Pb5 brasses fulfillment of plaster mould cavity during underpressure casting

Pawlak M.

Archives of Foundry Engineering

2010

Vol. 10, iss. 4

163--168

Results of research on ability of a plaster mould cavity to be filled up on casting with alloy CuSn10 and CuSn5Zn5Pb5 are presented in this paper. The cylindrical plaster mould ø110x290 was casting using underpressure in the Vacuum Pressure Casting Machine VC500D of Indutherm. The size of mould cavity was ø15x200 mm and gauge: 2,0; 1,0; 0,8 and 0,6 mm, the temperature of pouring alloy was 1120, 1140, 1160, 1180 and 1200°C, temperature of plaster mould in the casting moment was 400, 500 and 600°C. The effectiveness of a mould cavity to be filled up on the difference distance from the centre of the mould was assesmented too used to mould cavity 10x200 mm and gauge: 2,0; 1,0; 0,8 and 0,6 mm. On the base of the results of the investigation its possible to reach a conclusion, that the best temperature of casting and temperature of the plaster mould tf=500÷600°C. The distance of mould cavity from the mould centre doesn’t have a practical meaning for its ability to be filled up.