低频脉冲磁场对60Si2CrVA弹簧钢凝固组织的影响  

Effect of Low Frequency Pulsed Magnetic Field on the Solidification Structure of 60Si2CrVA Spring Steel

作　　者：朱成 李应举[1] 罗天骄[1] 郑策 冯小辉[1] 杨院生[1] ZHU Cheng;LI Ying-ju;LUO Tian-jiao;ZHENG Ce;FENG Xiao-hui;YANG Yuan-sheng(Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,Liaoning,China)

机构地区：[1]中国科学院金属研究所,辽宁沈阳110016

出　　处：《铸造》2024年第10期1374-1377,共4页Foundry

基　　金：国家重点研发计划(2018YFA0702900);国家科技重大专项(J2019-VII-0002-0142);国家自然科学基金(51831007)。

摘　　要：研究了浇注前与浇注后施加脉冲磁场对60Si2CrVA弹簧钢凝固组织的影响。结果表明,浇注前与浇注后施加脉冲磁场对铸锭边部柱状晶生长均有明显的抑制作用,对铸锭心部晶粒有明显的细化作用,但二者之间差别不大。与常规浇注铸锭相比,浇注40 s后施加脉冲磁场柱状晶区仅为(4.9±0.3)mm,降低了53.7%,心部晶粒尺寸细化至(407±30)μm,降低了47%。脉冲磁场引入的强制对流可使中心熔体的平均冷却速率由常规时的1.45℃/s提高至2.36℃/s左右。脉冲磁场调控凝固组织的作用机制主要是促进了晶核增殖和漂移,对柱状晶生长的阻碍效果更明显。Effect of applying a pulse magnetic field before and after pouring on the solidification structure of 60Si2CrVA spring steel was studied.The results show that both the application of pulsed magnetic field before and after pouring significantly inhibits the growth of columnar crystals at the edge of the ingot and refines the grains in the center of the ingot.However,there is little difference between the two cases.Compared to conventionally casting,the application of pulsed magnetic field after 40 seconds of pouring results in a reduction of the columnar grain zone to(4.9±0.3)mm,a decrease of 53.7%,and a refinement of the grain size in the center to(407±30)μm,representing a 47%reduction.In addition,the application of low voltage pulsed magnetic field increased the average cooling rate at the center region of the melt from 1.45℃/s(without applying the magnetic field)to 2.36℃/s.The mechanism of pulsed magnetic field regulating solidification microstructure primarily lies in promoting the proliferation and drifting of crystal nuclei,with a more pronounced inhibiting effect on the growth of columnar crystals.

关 键 词：脉冲磁场 弹簧钢 凝固组织 晶粒细化 

分 类 号：TG261[金属学及工艺—铸造]