摘要
本文探究了Inconel 718镍基高温合金激光定向能量沉积过程静磁场对微观组织演变的影响。结果显示,枝晶间距随磁场强度增加而增加。EBSD结果表明,随着磁场强度的增加,组织内晶粒尺寸逐渐增大,并导致多熔道间出现外延生长的现象。本文从磁场对熔体对流的影响方面讨论这些现象形成机理,并提出应用静磁场可有效限制马兰戈尼对流。
The influence of a static magnetic field on microstructure evolution of inconel 718 alloys during laser direct energy deposition was studied. Results show that dendrite spacing increases with increasing magnetic field flux density.Moreover, EBSD results reveal that the epitaxial growth is preferred with increasing magnetic field flux density. We discuss these findings in terms of the influence of magnetic field on melt convection and propose that the application of static magnetic field can effectively limit Marangoni convection.
作者
杜大帆
何林
董安平
陈彪
孙宝德
DU Dafan;HE Lin;DONG Anping;CHEN Biao;SUN Baode(Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming,Shanghai Jiao Tong University,Shanghai 200240,China;State Key Lab of Metal Matrix Composites,Shanghai Jiao Tong University,Shanghai 200240,China;State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China)
出处
《铸造技术》
CAS
2022年第9期725-732,I0026,共9页
Foundry Technology
基金
国家自然科学基金(51901135,52071205,52101089,51821001)
凝固技术国家重点实验室开放课题(SKLSP202214)
上海交通大学“深蓝计划”基金(SL2020MS019)。
