电磁搅拌和二冷区冷却强度对Incoloy800H高温合金连铸坯的内部质量影响  

Effect of electromagnetic stirring and second cooling condition on the inner quality of Incoloy800H superalloy billet

作　　者：王菲[1,2] 王韬[1,3] 张兴武[1,3] 邓安元[1,3] 王恩刚[1,3] 

机构地区：[1]东北大学材料电磁过程教育部重点实验室,辽宁沈阳110004 [2]东北大学材料科学与工程学院,辽宁沈阳110004 [3]东北大学冶金学院,辽宁沈阳110004

出　　处：《连铸》2016年第3期53-58,共6页Continuous Casting

基　　金：国家自然科学基金重点资助项目(50834009);教育部科学技术研究重大项目资助项目(311014);中央高校基本科研业务费专项资金资助(N090609001);高等学校学科创新引智计划资助项目(B07015)

摘　　要：研究了不同方式的二冷区电磁搅拌和冷却强度对Incoloy800H高温合金连铸坯凝固组织和内部裂纹的影响。研究结果表明:施加电磁搅拌后的连铸坯内部等轴晶组织比例增加,晶粒细化。单向连续电磁搅拌增加等轴晶比例和细化晶粒的作用效果优于正反交替电磁搅拌。当二冷区冷却水流量由3.0 m^3/h增加至7.1 m^3/h时,等轴晶比例减小,晶粒粗化;电磁搅拌对连铸坯内部裂纹有抑制作用,且单向连续电磁搅拌效果最好。当二冷区冷却强度增加时,铸坯内部熔体的温度梯度增加从而增大热应力,同时由于电磁搅拌的作用时间的减少,使铸坯内部质量恶化,产生严重的内部裂纹。The experiments were conducted to research the effect of EMS（electromagnetic stirring） and different secondary cooling conditions on the solidification structure and internal cracks of Incoloy800 H superalloy billets. The results showed that applying EMS increased the ratio of equiaxed grain and decreased the average grain size. The effect of the continuous electromagnetic stirring was better than that of the alternative electromagnetic stirring. With the secondary cooling intensity increasing from 3.0 m^3/h to 7.1 m^3/h,the ratio of equiaxed grain could be decreased and the average grain size was increased. The application of EMS inhibited the formation of internal crack of Incoloy800 H superalloy billet,and the effect of the continuous electromagnetic stirring was better than that of the alternative electromagnetic stirring.The increasing of the secondary cooling intensity caused more serious internal crack of Incoloy800 H superalloy billet.

关 键 词：Incoloy800H高温合金 电磁搅拌 连铸 内部裂纹 

分 类 号：TG132.3[一般工业技术—材料科学与工程] TG249.7[金属学及工艺—合金]