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首页> 外文会议>World foundry congress on fonderie sans frontieres casting without borders giessen ohne grenzen >PREVENTION OF MACRODEFECTS IN SQUEEZE CASTING OF AL ALLOYS
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PREVENTION OF MACRODEFECTS IN SQUEEZE CASTING OF AL ALLOYS

机译：预防挤压挤压的宏观铸造

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摘要

The squeeze casting of Al-4.5wt%Cu and Al-7wt%Si alloys was carried out to investigate the conditions for the formation and the prevention of macrosegregation. The effects of the process parameters, applied pressure, die temperature, pouring temperature, and delay time on the formation of macrosegregation were investigated in correlation with the evolution of macrostructure and shrinkage defects. Two critical applied pressures were defined: one is the critical applied pressure, P_(SC), under which shrinkage defects form, and the other is the critical applied pressure, P_(MS), above which macrosegregates form in the squeeze castings. Quantitative diagrams describing the optimum process conditions were proposed for obtaining sound squeeze castings. It was found that the pouring temperature, the die temperature, and the delay time are closely related to the two critical applied pressures P_(SC) and P_(MS), in different manners. It was concluded that sound castings without macrosegregation and shrinkage defects can only be obtained when the applied pressure is in the range of P_(SC) < P < P_(MS) in both Al-4.5wt%Cu and Al-7wt%Si alloys.
机译：进行Al-4.5wt％Cu和Al-7wt％Si合金的挤压铸件，以研究形成和预防宏指令的条件。研究了工艺参数，施加压力，芯片温度，浇注温度和延迟时间对形成宏观聚糖的形成的效果，与宏观结构和收缩缺陷的演变相关。定义了两个关键施加的压力：一个是临界施加压力，P_（SC），在该缺陷形式的收缩缺陷形式，另一个是临界施加的压力P_（MS），上述挤压铸件中的宏观测定形成的宏观施加压力。提出了描述最佳过程条件的定量图，用于获得声音挤压铸件。发现浇注温度，模具温度和延迟时间与不同方式的两个关键施加的压力P_（SC）和P_（MS）密切相关。得出结论，当施加的压力在Al-4.5wt％Cu和Al-7wt％Si合金中的P_（SC）

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