高速双ロールキャスタにより作製した６０２２アルミニウム合金板の内部割れと鋳造条件
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Influence of casting conditions on the occurrence of internal cracks for 6022 aluminum alloy fabricated by high-speed twin roll-caster was investigated. The caster used in the study was equipped with a pair of water-cooled, pure copper rolls, and a cooling slope upstream of the rolls. The strips exhibited a common microstructural feature. Columnar grains grew from both surfaces of the strip, and they were gradually replaced by equiaxed grains. In the mid-central region, a band of fine grains was observed. Such fine grains seemed to originate from the crystallized α-Al dendrites on the cooling slope or the roll surfaces. Internal cracks were observed in the 6022 aluminum alloy strip that was subjected to the highest cooling rate. The cracks were located between equiaxed grains and fine grains at the mid-central region. It was thought that the crack was caused by a lack of liquid supply at the mid-central region where the solidified shells meet together. The cracks were reduced without using cooling slope, with decreasing casting load and lowering metal head. A slight reduction in the cooling rate and reduction of α-Al generation were effective for obtaining sound 6022 aluminum alloy strips.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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