为了揭示铸件性能对热处理过程淬火冷却条件的敏感性,研究了淬火介质及淬水转移时间对A357合金析出相与力学性能的影响.结果表明,热处理T6态合金的强度和硬度随着淬火冷却速率的增加而增大,而相对延伸率呈减小的趋势.强度和硬度随淬水转移时间的延长而减小,而相对延伸率先增大后减小.差示扫描量热仪(Differential Scanning Calorimetry,DSC)实验表明,不同淬火冷却条件下析出β'-Mg2Si亚稳相的量和Si相的形态是合金力学性能变化的主要原因.
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