SURFACE RESIDUAL-STRESSES GENERATED IN TH E 5083-ALUMINUM-ALLOY PLATES BY ONE-PASS COLD-ROLLING

Effects of one-pass rolling on the surface residual stresses generated in the 5083 aluminum alloy plates were investigated. Generation behav ior of the residual stresses was examined in terms of plate thickness, reduction per pass and working roll diameter. Measurement of the surf ace residual stresses in the rolling direction was made by an X-ray an alysis method. Distributions of the surface residual stresses in the p late contact area of the working rolls were also measured. Generation mechanisms of the surface residual stresses were discussed. The major results are summarized as follows: Tensile residual stresses for vario us initial thickness specimens initially increase with increasing in p late thickness and then show peak values at a specific plate thickness . The specimens rolled by small working rolls show higher tensile resi dual stresses than the specimens rolled by large working rolls. Inhomo geneities of the plastic deformation in a range of X-ray penetration d epths have a great influence on the generation of surface residual str esses.