Study on casting structure (2nd Report):Relation between the casting structure and the recrystallized structure in 1S or 2S alloy containing 0.5% Mg
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概要
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The effects on the properties of 1S and 2S aluminium, which appear when 0.5% Mg is added to it, was studied through experiments.Findings are summed up as follows:(1) Hardness of cold-rolled or annealed sheets gets higher by addition of 0.5% Mg while the softening time becames longer.(2) Corrosion resistance against NaCl 6%+H2O2 0.3% aqueous solution is improved.(3) Producing velocity of oxide film by anodic oxidation process is promoted and the film thus produced is thicker than that produced on 1S or 2S under same conditions. This gives the alloy good corrosion and erosion resistances.(4) Through preheating at 420°C of slab ingot, the casting structure gets finer and the compounds are precipitated. This phenomenon takes place more remarkably in supercooled ingot.(5) When preheated, the recrystallized grains become coarser, the hardness after annealing becomes lower and the velocity of softening becomes faster.(6) In rapidly cooled ingot, the recrystallized grains becomes finer and the softening velocity becomes faster. In continuously cast slab ingot, the grains in the part of granular structure become finer than those in the part of columnar structure. This phenomenon is also concerned to the condition of casting structure.
- 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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