Accession Number : AD0830256

Title :   FLOW FIGURES ON METAL SURFACES: THEIR CAUSE AND PREVENTION,

Corporate Author : GENERAL DYNAMICS/ASTRONAUTICS SAN DIEGO CA

Personal Author(s) : Ergang, R.

Report Date : 24 DEC 1958

Pagination or Media Count : 8

Abstract : Characteristic, usually striated surface depressions, which can be readily perceived by the eye appear in areas of low deformation on pressing or deep drawing of steel plates. Since the differences in the depth of these striations lie between 4 and 10 microns, these rough areas are very disturbing, especially where deformed plates are used without surface treatment. This phenomenon has been observed for a long time, but recently it was noted also with numerous other metals, e.g. with aluminum and several of its alloys as well as with German silver and brass. Therefore, it appears to be of general interest to explain the formation of flow figures from their common origin and to indicate methods of preventing them during the fabrication. (Author)

Descriptors :   (*METALS, SURFACE PROPERTIES), (*DRAWING(FORMING), DEFECTS(MATERIALS)), MANUFACTURING, METAL PLATES, STEEL, ALUMINUM ALLOYS, SILVER ALLOYS, NICKEL ALLOYS, ELASTIC PROPERTIES, STABILITY, DEFORMATION, WEST GERMANY.

Subject Categories : Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE