摘要
研究了W、Mo对MX246系列Ni3Al基合金凝固过程中枝晶偏析以及低熔点相形成的影响。研究发现,随着W和Mo的增加,Al和Ti由在枝晶干偏聚转向在枝晶间偏聚。不含W、Mo的合金中,Zr在枝晶间强烈偏聚,其含量约为枝晶干的103倍,有Ni Zr低熔点相形成。添加了2wt%W和4wt%Mo后,Zr和Hf在枝晶间的偏析显著变小,其含量为枝晶干的3倍左右,无低熔点相形成。
The influence of addition of W and Mo in Ni3Al-based alloys on dendritic segregation and formation of low-melting phase were studied in this article. The results show that with the increase of W and Mo, Al and Ti are segregated from dendritic to interdendritic. Zr is strongly segregated in interdendritic areas in the Ni3Al-based alloys without W and Mo. The amount of Zr in interdendritic areas is 103 times to dendritic areas and low-melting phase is formed. The degree of segregation of Zr and Hf are decreased obviously with the addition of 2% W and 4% Mo(mass fraction). The amount of Zr and Hf in interdendritic areas are about 3 times to dendritic areas and no low-melting phase is formed.
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2011年第S2期549-552,共4页
Journal of Iron and Steel Research
关键词
NI3AL基合金
枝晶偏析
合金元素
低熔点相
Ni3Al-based alloys
dendritic segregation
alloying element
low-melting phase
