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首页> 外文会议>63rd World Foundry Congress Sep 12-18, 1998 Budapest, Hungary >PREVENTION OF MACRODEFECTS IN SQUEEZE CASTING OF AL ALLOYS
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PREVENTION OF MACRODEFECTS IN SQUEEZE CASTING OF AL ALLOYS

机译：铝合金挤压铸造中的宏观缺陷的预防

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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：通过挤压铸造Al-4.5wt％Cu和Al-7wt％Si合金来研究形成和防止宏观偏析的条件。研究了工艺参数，施加压力，模具温度，浇注温度和延迟时间对宏观偏析形成的影响，并与宏观结构和收缩缺陷的发展相关。定义了两个临界施加压力：一个是临界施加压力P_（SC），在该压力下会形成收缩缺陷，另一个是临界施加压力P_（MS），在此之上会在挤压铸件中形成宏观偏析。提出了描述最佳工艺条件的定量图，以获得最佳挤压铸件。发现浇注温度，模具温度和延迟时间与两种临界施加压力P_（SC）和P_（MS）密切相关，方式不同。结论是，只有在Al-4.5wt％Cu和Al-7wt％Si合金中施加的压力在P_（SC）

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