InconelX-750合金大型电渣锭重熔过程的模拟Simulation of remelting process of InconelX-750 alloy large electroslag ingot
陈琨,王立民
摘要(Abstract):
利用MeltFlow模拟软件对大型InconelX-750合金电渣锭铸态组织的一次、二次枝晶间距进行模拟计算,并对实际生产的电渣锭取样进行显微组织观察。模拟计算结果表明:不同合金元素对冷却速率和局部凝固时间的变化敏感程度不同,但是在整个电渣锭范围内分布均匀,无明显宏观偏析;由电渣锭头部向尾部、中心位置到边缘,一次、二次枝晶间距逐渐减小,在相同位置,电渣锭头部的枝晶间距大于尾部。实验结果表明:电渣锭由中心位置到边缘,随着凝固过程中过冷度的增加,枝晶组织尺寸和枝晶端部曲率半径逐渐减小,且中心位置的一次枝晶间距大约是边缘位置的1.9~2.4倍,中心位置二次枝晶间距大约是边缘位置的1.4~1.6倍。相同位置,电渣锭头部的枝晶组织尺寸和枝晶间距大于尾部;电渣锭头部试样枝晶间析出大量针状相,而尾部仅有少量的块状相弥散析出;枝晶间距模拟计算结果和实验测量结果基本一致,可以利用该模拟软件对电渣锭凝固之后的枝晶间距进行预测。
关键词(KeyWords): 大型InconelX-750电渣锭;电渣重熔模拟;枝晶间距;枝晶端部曲率半径
基金项目(Foundation):
作者(Author): 陈琨,王立民
DOI: 10.13289/j.issn.1009-6264.2020-0103
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