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材料工程  2013 

复合熔盐净化剂优化对GH4169高温合金过冷的影响

DOI: 10.3969/j.issn.1001-4381.2013.08.002, PP. 11-15

Keywords: 高温合金,净化剂,保温时间,过热度,深过冷

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Abstract:

采用复合熔盐净化法对GH4169高温合金的深过冷进行研究,通过正交实验优化出GH4169高温合金深过冷的最优净化剂及工艺参数,从而使GH4169高温合金获得了250K的大过冷度,同时探讨了复合熔盐净化剂及工艺参数作用机理;通过对不同过冷度下凝固组织的观察发现,随着过冷度的增加,合金组织明显细化,并发生两次晶粒转变,由树枝晶向粒状晶转变。当过冷度超过250K后,晶粒平均尺寸达到5.5μm。

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