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金属学报  2011 

电弧熔炼态Laves相Cr2Nb/Cr合金的微观组织演变

DOI: 10.3724/SP.J.1037.2010.00700, PP. 663-670

Keywords: 真空非自耗电弧熔炼,Laves相Cr2Nb,离异共晶,共晶领先相

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Abstract:

采用真空非自耗电弧熔炼法制备了Cr-12%Nb(原子分数,下同)和Cr-20%Nb2种成分合金的纽扣锭,利用XRD,OM,SEM和EDS对电弧熔炼态纽扣锭不同位置的组织及其竞争生长进行了研究.结果表明Cr-12%Nb合金纽扣锭底部为细小的离异共晶,中部和顶部则由粗大的初生Cr相和共晶组织(Cr2Nb+Cr)组成.而Cr-20%Nb纽扣锭底部出现的是胞状层片共晶组织,层片间距为0.3μm,随着距纽扣锭底部距离的增加,冷却速率逐渐降低,凝固组织中相继出现Cr2Nb板条枝晶和花瓣状Cr2Nb枝晶.同时,基于TMK快速凝固共晶模型和BCT枝晶生长模型,通过计算并比较共晶组织和Laves相Cr2Nb枝晶界面生长温度,借助最高界面生长温度判据,很好地解释了Cr-20%Nb合金凝固组织的演变及其形成原因.

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