坩埚冷却系统改造对中间合金熔炼的影响  

Effect of Cooling Method on Melting Process of Zirconium Alloy

作　　者：王旭峰 李中奎[1,2] 张建军 周军 田锋 王文生 石明华 

机构地区：[1]西部新锆核材料科技有限公司,陕西西安710016 [2]西北有色金属研究院,陕西西安710016

出　　处：《钛工业进展》2013年第4期40-43,共4页Titanium Industry Progress

摘　　要：以Zr-Sn-Fe-Cr-Ni合金为研究对象,通过2次非自耗真空电弧熔炼制备出中间合金,对熔炼中间合金时所采用的坩埚的冷却系统进行了改造,对比了改造前后中间合金的熔炼过程,并采用OM、EDS研究了中间合金的组织及化学成分,再以添加中间合金扣方式压制电极,利用真空自耗电极熔炼方式制备出吨级锆合金铸锭,并对成品铸锭的成分进行跟踪。结果表明:在坩埚中加入导流槽后,中间合金的熔炼效率得到了提高,熔炼时难脱模现象大大缓解;采用加导流槽后的坩埚经过2次熔炼可以制备出成分均匀的中间合金,合金组织由柱状晶和树枝晶组成,与未加导流槽时所熔炼的合金相比,组织及成分更加均匀;采用冷却系统改造后的坩埚熔炼的中间合金可以制备出成分均匀的工业规模级锆合金铸锭。Some of the Zr-Sn-Fe-Cr-Ni intermediate alloy samples were made by two non-consumable vacuum arc melting method, and the melting process was studied before and after the crucible structural transformation, the microstructure and the chemical composition of the alloy were investigated by 0M/EDS. Then a ton zirconium alloy ingot was made by vacuum consumable electrode melting method by adding intermediate alloy. The results shows that the melting efficiency can be improved and the melting difficult stripping phenomenon can be reduced greatly by adding diversion channel, and the intermediate alloy can reach a uniform composition by two melting times. The microstructure of the intermediate alloy which is melted by the transformed crucible consists of columnar and branch crystals, and the micro- structure and composition are both more uniform than the intermediate alloy which is melted by the untransformed crucible. Besides, an industrial scale grade zirconium alloy ingot with uniform composition can be prepared by adding intermediate alloy melted by the modified crucible.

关 键 词：锆合金 熔炼 微观组织 成分 

分 类 号：TF841.4[冶金工程—有色金属冶金]