本文评述了二元系统一次枝晶间距模型的发展及特点,并验证了在多元合金系统中的适用性,结果表明,在DD8单晶高温合金中,λ_1-G 关系符合二元系统模型,但λ_1-V 关系和二元系统模型有较大的偏离,λ_1为一次枝晶间距,G 为温度梯度,V为凝固速率。在本文凝固条件下,DD8合金的λ_1-G,V关系式为:λ_1=1141.5G~(-0.52)V~(-0.12),其中λ_1单位为μm,G 为K/mm,V为μm/s。
Several models of primary dendrite spacing for binary alloy were reviewed.A comparison ofthe models with experimental data in a SC multicomponent superalloy was carried out for examining thecompatibility of the models.Results indicate an obvious deviation
参考文献
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| [5] | Hunt J D,Solidification and Casting of Metals,The Metals Society,London,1979 |
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