AN X-RAY STUDY OF PIANO WIRES

Abstract

he relation between the crystalline structure and the degree of cold working was investigated with the imported piano wires of excellent quality and those furnished by a Japanese factory. The size, the degree of fibrous arrangement and the internal strain of grains in the specimens plastically deformed in various grades were measured by means of X-rays. Then the density of specimens which had been cold worked differently was measured precisely and their heat treatment was examined. From the result of the measurement, a comparison between the excellent imported wires and those furnished by Japanese factory was made.