With the increasing application of aluminum foundry alloys for automotive and aerospace components, the aluminum industry must pay close attention to component quality and dependability. This article focuses on the interpretation of the relative density and porosity of Al foundry casting and rheocasting alloys AlSi7Mg. The most popular Al-Si alloy grain refinement utilized in the casting and rheocasting processes is AlSi7Mg. The limitations are using comparable density findings to determine the quality of a component of casting or rheocasting state. Two approaches are employed to attain this goal, first the theoretical analysis using the JMatPro software, which offers density distribution results depending on the chemical composition of the aluminum alloy. Second,the experimental Archimedes method, which provides density data on actual aluminum castings alloy. This study advances substantial research on microstructure, grain sizes, form shape factors, theoretical and practical density, shrinkage porosity, casting and rheocasting application samples alloy, and potential industrial applications of AlSi7Mg. The results show that the average grain size is significantly more uniform in the rheocasting comparing to casting average grain size results. In addition, the results from the metallographic image analysis of casting and rheocasting application shows five different zones from the bottom to the top of the sample. Finally, the study observed that the shrinkage porosity in the casting application sample is higher than those of rheocasting application sample.

ABSTRCT: This study deals with the effect of annealing temperature on the mechanical properties of SG 255 steel. Furthermore it aims to experimentally obtain better mechanical properties in particular ductility with lower annealing temperature and to minimize the cost of the manufacturing. The SG 255 steel is used in manufacturing of domestic LPG cylinder at Halala Company located in Sulaimanyah/Iraq. A number of samples were made according to ISO 6892, and then heat treated with different annealing temperature (850, 900 and 950 ºC). Moreover, the mentioned samples were broken by tensile machine to obtain the required mechanical properties, and to be compared with that of Halala factory. It was shown that higher elongation percentage 34.18%El with lower annealing temperature 900 ºC can be achieved and this leads to decrease the cost of manufacturing without degrading of cylinder's quality.

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