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本文叙述了铝锌镁高强度铸造铝合金ZL24(S)的特点,它抗拉强度高,热处理后σ_b为27—35kg/mm~2,加工后表面光洁度高,另件在使用过程中尺寸稳定性好,合金对产生针孔的敏感性较小,合金不需要变质处理,熔炼工艺简单,铸件可在空气中淬火,因此比水淬变形小。合金的化学成分为:3.5—4.5％Zn,1.5—2.2％Mg,0.3—0.6,6Ma,0.2—0.3％Ti其余为铝,有害杂质铁明显降低机械性能,因此限制在0.5％以下,文章叙述了熔炼工艺,合金的热处理规范;T_5为540±5℃保温6小时,在空气中冷却,然后160℃保温16小时,铸态时效可采用180—190℃保温8小时,此外还谈到了热处理规范对另件尺寸稳定性的影响。
This paper describes the characteristics of Al-Zn-Mg high-strength cast aluminum alloy ZL24 (S), which has high tensile strength, σ b of 27-35kg / mm ~ 2 after heat treatment, high surface finish after processing and dimensional stability during use Good, the sensitivity of the alloy pinhole is small, the alloy does not require deterioration treatment, smelting process is simple, the casting can be quenched in the air, so smaller deformation than water quenching. The chemical composition of the alloy is: 3.5-4.5% Zn, 1.5-2.2% Mg, 0.3-0.6,6Ma, 0.2-0.3% Ti and the balance of aluminum, the harmful impurities of iron significantly reduce the mechanical properties, thus limiting to 0.5% or less, the article describes The smelting process, alloy heat treatment specifications; T_5 for 540 ± 5 ℃ heat 6 hours, cooled in air, and then incubated at 160 ℃ for 16 hours, the aging time can be cast 180-190 ℃ insulation 8 hours, also talked about the heat treatment specifications The other dimensional stability of the impact.