Microstructure of Centrifugal Cast Pipes Fabricated using α or β Brass Machining Chips

Abstract

  In our previous study, high strength brass pipes were fabricated by the centrifugal casting with machining chips. It was found that the obtained centrifugal casts have smaller microstructures. This study was carried out to discuss the origin of the refined microstructure. For this purpose, α and β brass machining chips and molten α brass where primary crystal was α phase and α+β brass where primary crystal was β phase were used, and systematical casting experiments were carried out. It was found that the grain sizes of α and β matrix casts with α and β brass machining chips, respectively, were smaller than those of α and β matrix casts with β and α brass machining chips, respectively. These results can be explained by disregistry value between machining chip phase and primary crystal phase.