Effect of process condition in the centrifugal casting on the mechanical behavior of Cr heat resisting steel

In the present study, the effects of forging or ring-mill processing on the tensile properties of B7B4 were investigated. Tensile specimens were fabricated including centrifugal casting (Case 1), centrifugal casting + forging (Case 2), and centrifugal casting + ring-mill (Case 3). Tensile tests were performed at room temperature. An optical microscope and a scanning electron microscope (SEM) were used to examine the changes in the microstructures of the specimens prepared by the three processes. The results showed that the moduli of elasticity and yield stresses of B7B4 prepared by the three processes had no much difference. The elongations of Case 2 and Case 3 were 30% higher than that of Case 1. SEM images revealed that the orientation and fine structure were affected by the forging and ring-mill processes.