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金属学报  2011 

γ-TiAl基合金汽车排气阀吸铸充型过程水模拟

DOI: 10.3724/SP.J.1037.2011.00354, PP. 1408-1417

Keywords: &gamma,-TiAl基合金,汽车排气阀,吸铸,水模拟

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Abstract:

熔模吸铸是一种经济的γ-TiAl基合金汽车排气阀成型方法,但早期的吸铸气阀存在严重的气孔缺陷,这种缺陷的产生与吸铸充型过程的合金液流动密切相关.为了直接观察和测量γ-TiAl基合金汽车排气阀吸铸充型过程中合金液的形态和卷气现象,采用水模拟实验模拟了3种充型压力控制方式,两种壳型组合形式下气阀吸铸充型过程.模拟结果表明,利用壳型顶部通气孔粗略控制充型压力的普通吸铸过程存在严重的卷气现象;精确控制充型压力的“下进气法”和“上排气法”,充型流动平稳,充气流量<1.7m3/h或排气流量<1.5m3/h时,充型流动无卷气现象.进行了γ-TiAl基合金汽车排气阀吸铸实验,实验结果与水模拟结果吻合.应用吸铸充型运动学原理对上述现象进行了讨论.

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