摘要
为减少大型铁镍基合金锭电渣重熔过程产生的铸锭头尾Al和Ti元素分布不均现象。基于分子-离子共存理论建立了GH4706合金电渣重熔过程中Al和Ti元素烧损的热力学模型。根据理论计算分析,使用Wagner公式中一阶活度相互作用系数可以计算铁镍基合金熔液中Al和Ti元素活度。将Fe和Ni视为基体,不考虑Ni元素对合金中其他组元活度相互作用系数的影响可得到较为准确的计算结果。在五元渣系CaO-MgO-Al_(2)O_(3)-TiO_(2)-CaF_(2)中,控制渣中TiO_(2)质量分数在2%~6%范围内可有效抑制合金中铝、钛元素的烧损。采用计算所得渣系成分,工业试验成功冶炼出直径为1 100 mm的GH4706电渣锭,且Al和Ti烧损量小于10%。
In order to reduce the nonuniform distribution of Al and Ti elements in the large Fe-Ni-based alloy ingot during the electroslag remelting(ESR) process, the thermodynamic model for the burning loss of Al and Ti in the GH4706 alloy was established based on the ion and molecule coexistence theory(IMCT). The activity of Al and Ti in Fe-Ni-based alloy can be calculated by using the first-order activity interaction coefficient in the Wagner formula. Taking Fe and Ni as the matrix and ignoring the influence of Ni element on the activity interaction coefficient for other elements in the alloy, a more accurate calculation result can be obtained. In the CaO-MgO-Al_(2)O_(3)-TiO_(2)-CaF_(2) slags system, the burning loss of Al and Ti elements can be effectively inhibited by controlling the content of TiO_(2) between 2%-6% in the slags system. GH4706 electroslag ingot with ? 1 100 mm was successfully smelted by using the calculated results for the slags composition, and the content of burning loss of Al and Ti elements was less than 10%.
作者
沈中敏
郭靖
段生朝
郭汉杰
段然
李连鹏
SHEN Zhongmin;GUO Jing;DUAN Shengchao;GUO Hanjie;DUAN Ran;LI Lianpeng(School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing Key Laboratory of Special Melting and Preparation of HighEnd Metal Materials,University of Science and Technology Beijing,Beijing 100083,China;Beijing Gaona Aero Material Co.,Ltd.,Beijing 100081,China;Fushun Special Steel Co.,Ltd.,Fushun 113001,Liaoning,China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2021年第9期901-910,共10页
Journal of Iron and Steel Research
基金
国家青年科学基金资助项目(51704021)
国家自然科学基金资助项目(U1560203)
中央大学基础研究基金资助项目(FRF-TP-20-004A3,FRF-TP-19-030A2,FRF-TP-16-079A1)。
关键词
镍基高温合金
电渣重熔
烧损
nickel-base high temperature alloy
electroslag remelting
burning loss
