Abstract
The structure changes by cold-rolling and low-temperature annealing of 70/30 brass were investigated by a microscope and X-ray photography. The difference in ready-to-finish grain size affects the development degree of the rolling structure. A coarse-grained material tends to delay the development, compared with a fine-grained one. The tendency is thought to be connected with the hardness change by low-temperature annealing as previously reported. No remarkable change of structure is observed by annealing at 150°, while a kind of polygonization is recognized at 250°. Though the nuclation by recrystallization develops preferentially at the regions strained severely,grain growth was observed along the slip lines at 350°. The difference in grain size affects the recrystallization process in its velocity.
