(西北工业大学 凝固技术国家重点实验室， 西安 710072)
摘 要: 介绍了高熔点大密度铁、 镍基合金的电磁约束成形定向凝固的两种先进技术。 在系统研究电磁场与温度场及其耦合作用的基础上， 利用特殊设计的双频双感应器成功地实现了多种截面形状的不锈钢及高温合金的无容器电磁约束成形。 借助于特制的磁结晶器获得了电磁软接触的高温合金近终形定向凝固叶片样件。
关键字: 电磁约束成形； 定向凝固； 高温合金； 叶片
（State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi′an 710072, China）
Abstract:Two advanced technologies of electromagnetic confinement to process the Fe- and Ni-base alloys for castings and ingots with shaped cross section were introduced. Based on systematically investigation on the distribution behavior of magnetic and temperature field and their coupling effect, the containerless electromagnetic shaping of stainless steel and superalloy test samples were successfully realized by means of an specially designed vacuum apparatus with dual induction coils and dual frequencies and by using of a tailor-made crystallizator, the near-shape superalloy turbine blade castings with directionally solidified microstructure by electromagnetic soft-contact confinement technology were also obtained. The dynamic stability and profile behavior of melt and temperature gradient during electromagnetic confinement were presented, the results by quasi-3D calculation simulating the electromagnetic shaping process in consistent with experiments were also given.
Key words: electromagnetic confinement; directional solidification; superalloys; turbine blade
