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铸造工艺参数对半连续铸造A390合金管坯宏微观组织的影响

DOI: 10.3969/j.issn.1005-3026.2015.10.013, PP. 1426-1430

Keywords: A390合金,初生Si,管坯,铸造温度,铸造速度

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Abstract:

采用半连续铸造方法制备了A390合金管坯.研究了铸造速度和铸造温度对A390合金管坯宏微观组织的影响.结果表明:随着铸造速度由90mm/min提升至120mm/min、铸造温度由800℃增加至850℃,管坯中初生Si宏观分布趋于均匀,初生Si颗粒的平均尺寸逐渐减小.截面尺寸为164mm/60mm的半连续铸造A390合金管坯的最佳铸造工艺参数为:铸造速度110mm/min、铸造温度850℃,可以获得初生Si宏观分布均匀、初生Si颗粒平均尺寸不超过26μm的管坯,管坯内侧的抗拉强度为264MPa,延伸率为0.5%.

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