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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >Prevention of Macrodefects in Squeeze Casting of an Al-7 Wt Pct Si Alloy
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Prevention of Macrodefects in Squeeze Casting of an Al-7 Wt Pct Si Alloy

机译：防止Al-7 Wt Pct Si合金挤压铸造中的宏观缺陷

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The squeeze casting of an Al-7 wt pct Si alloywas carried out in order to investigate the conditions for theformation and the prevention of macrosegregation. The effectsof process parameters such as applied pressure, die temperature,pouring temperature, delay time, degassing, and inoculation onthe formation of macrosegregation were investigated, incorrelation with the evolution of macrostructure and shrinkagedefects. Three critical applied pressures were defined, based onthe experimental results for the squeeze-cast Al-7 wt pct Si. Thefirst is the critical applied pressure under which shrinkagedefects form (P_(SC)). The second is the critical appliedpressure above which macrosegregates form (P_(MS)). Thethird is the critical applied pressure above which and underwhich minor segregation forms. (P_m and P_(MS),respectively). With the concept of these three critical pressures,an experimental diagram describing the optimum processconditions was proposed for obtaining sound squeeze castings.It was concluded that sound castings without macrosegregationand shrinkage defects can only be obtained when the appliedpressure is in the range where P_(SC)
机译：为了研究形成条件和防止宏观偏析的条件，进行了Al-7wt pct Si合金的挤压铸造。研究了施加压力，模具温度，浇注温度，延迟时间，脱气和接种等工艺参数对宏观偏析形成的影响，这些参数与宏观结构的演变和收缩缺陷有关。基于挤压铸造的Al-7 wt pct Si的实验结果，定义了三个临界施加压力。首先是临界施加压力，在该压力下会形成收缩缺陷（P_（SC））。第二个是临界施加压力，在该压力之上会形成宏观偏析（P_（MS））。第三是临界施加压力，在该临界压力之上和之下形成较小的隔离。 （分别为P_m和P_（MS））。根据这三个临界压力的概念，提出了描述获得压挤铸件最佳工艺条件的实验图。结论是，只有当施加压力在P_（SC）范围内时，才能获得没有宏观偏析和收缩缺陷的铸件。

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