Abstract
Oxidation of the molten 85-5-5-5 red brass which is a correlative problem with the dissolution of reducing gases has been studied by means of the fracture test of chill-blocks, centrifuging, electron-microscopy and X-ray diffraction.
The process of oxidation of the melt includes following three steps; i) oxidation of the reducing gases in the metal, at this step the cast-block has the extended columnar and blue-grey patterns on its fracture: ii) preference oxidation of an alloying constituent such as zinc, where, further shortened columnar and blue-grey patterns are formed on the fracture of cast-block: and finally, iii) formation of Cu2O simultaneously with oxidation of zinc, at this step the cast-block has markedly reduced size of the equiaxial grains. The nucleating cuprous oxide is also identified.
