Wyniki wyszukiwania - BazTech

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Computer modelling of the ablation casting process and prediction of the strength properties of AC-42000 castings

Małysza Marcin, Puzio Sabina, Major-Gabryś Katarzyna, Głowacki Mirosław, Wilk-Kołodziejczyk Dorota, Kamińska Jadwiga

Computer Methods in Materials Science

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2022

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Vol. 22, No. 2

79--88

EN

The demand for castings with superior properties has compelled the development and optimization of manufacturing technologies. By further developing already known techniques, we are able to contribute to the introduction of new research possibilities. The article presents the methodology of conducting simulation tests of the gravity casting process into sand moulds with the use of ablation. The ablation technique consists in spraying water through evenly spaced nozzles onto a mould into which the liquid casting alloy has been poured. The conducted research focuses on an alloy from the group of Al-Si alloys. In order to compare the effects of different techniques, additional tests were carried out for gravity casting into sand and metal die moulds. At the same time, virtual experiments were conducted to develop a simulation methodology for ablation casting technology, taking into account mould degradation. Additionally, the possibility of predicting the final mechanical properties of various manufacturing technologies was tested. Destructive tests were carried out to determine the mechanical properties in the cast samples, as well as microstructure tests and secondary dendrite spacing. The results of the mechanical tests are compared with the predicted simulation properties.

2

Grain refinement and heat treatment of gravity die cast A356

Lim Y. P.

Archives of Foundry Engineering

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2010

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Vol. 10, iss. 4

103--108

EN

The purpose of this investigation is to evaluate the effects of grain refiner TiCal315 (3%Ti, 0.15% C) and Al-5Ti-1B on the metallurgical properties of as-cast A356 gravity die castings as well as the improvement brought about by T6 heat treatment. The TiCal315 and Al-5Ti- 1B grain refiners were added separately into the A356 melt in different weight percentages of 0.25, 0.5, 0.75 and 1.0 to produce the gravity die casting samples. The geometry of the casting is designed to be cylindrical shape according to JIS H5202. The results show that TiCal315 is relatively more effective than Al-5Ti-1B to improve the tensile strength, hardness and elongation of A356 alloy by 10~20%. T6 heat treatment is confirmed to have more significantly improved the mechanical properties of A356 alloy compared to grain refinement. An Olympus imaging software was used to measure the average grain size of α-Al phase and the results do not show significant difference between TiCal315 and Al-5Ti-1B to grain-refine the A356 dendritic structures. The morphology of T6 heat treated A356 was changed where the irregular eutectic was converted into spherodized Si particles due to the solution treatment. This results in significant improvement in mechanical properties.

3

Improvement of quality of a gravity die casting made from aluminum bronze be application of numerical simulation

Fajkiel A., Dudek P., Walczak W., Zawadzki P.

Archives of Foundry Engineering

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2007

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Vol. 7, iss. 2

11-14

EN

The paper describes the possibility of improving the quality of gravity die cast connectors for overhead power transmission lines. The castings were made from aluminum bronze, grade CuAl9Fe1Ni1. A MAGMAsoft computer programme was used for simulation of the process of die filling and casting solidification to avoid defects, like shrinkage depression and gas porosities. The results of the simulation have finally led to redesigning of the metal feeding and cooling system and to reduced level of defects in castings.