تأثير پارامترهاي سرعت چرخش و دماي پيشگيرم قالب روي خواص مكانيكي آلياژ A413 توليد شده به روش ريخته گري گريز از مركز عمودي

Effects of the Rotation Velocity and Mold Pre-Heating Temperature on the Mechanical Properties of A413 Alloy Produced Via Vertical Centrifugal Casting

In this study, the effect of the casting conditions such as; pre-heating temperature and rotation velocity on the mechanical properties and micro structure of the as-centrifugal cast sample were investigated and then compared with gravity cast samples. Low weight small Si blades with small dimensions move to the inside of the sample because of segregation during casting. On the other hand, a few number of bigger Si blades with larger weight come to the surface of the sample that lead to the increasing of hardness from the outside to the inside of the sample. The segregation decreases with increasing of the rotation velocity and leads to the homogeneity of microstructure. The higher pre-heating temperature and lower rotation speed lead to the increasing of Si amount in the matrix of the samples. The aluminum concentration in the matrix of all samples is approximately equal, but it decreases in the Si blades and precipitated particles from outside to the inside of them. Fe concentration in the precipitation grains is more than other areas. Owing to segregation, precipitations with higher Fe concentration move to the outside of sample. Fe amount of the as-centrifuged sample in the near- surface is larger than that of the as-gravity cast samples.