アルミニウム合金のシャルピー衝撃破断特性に及ぼす冷間加工の影響

概要

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The effect of cold rolling, which set 20% to 40% area reduction along the crack propagation direction, on the Charpy impact properties of a medium atrength aluminum alloy (5083) was established by utilizing instrumented Charpy impact tests at temperatures rangimg from 77K to 473K for four kinds of specimens which werew cut out from a rolled plate in the directions parallel and vertical to the rolling direction. A standard V-notch was formed on the rolled surface of two specimens and in the vertial direction on the remaining two specimens. In general, by cold rolling the absorbed energy decreased remarkably by about 30 to 60% as compared with that of the unrolled 5083-O specimen in the temperature range of 77K to 373K. It was found that the effect of cold rolling on the absorbed energy differed considerably depending upon the crack propagation direction. When the crack propagation directionwas vertical to the rolled surface, an extraordinary increase of absorbed energy up to about 120% appeared at 77K as compared with that of the unrolled specimen. On the other hand, when the crack propagation direction was parallel to the rolled surface, the increase of amsorbed energy was about 35 to 55% at 474K. It is assumed that this extraordinary increase of absorbed energy at 77K is due to the occurrence of laminated fracture which was promoted by cold rolling.
社団法人日本材料学会の論文
1985-07-15