Estudo do comportamento da liga A332 sob condição semisólida com a variação do teor de estrôncio

Abstract

This work aimed to analyze the semi-solid behavior of the A332 alloy by adding chemical grain refiner and also different strontium contents as a modifying agent of the eutectic phase. For this, 5 groups of samples were analyzed, in which the commercially available A332 alloy was analyzed in the first group. From the second group a 94wt% Al-5wt% TI-1% B refining alloy was added in all groups and from the third onwards different strontium contents ranging from 200,400 to 600 ppm of Mr were added. To evaluate the microstructural changes in the samples, metallographic analyzes were performed. Afterwards the samples were submitted to the globularization treatment at a temperature of 567ºC with retention times of 0 seconds, 30 seconds and 90 seconds with the purpose of analyzing the morphological evolution. The results show a more efficient globularization for the samples containing the higher content of holding. Finally, to analyze the thixotropic behavior, a hot compression test was performed on the samples after the globularization treatment. It was possible to observe an improvement in rheological behavior for larger retention times in the samples.