单晶高温合金对接铸件内缩松缺陷的数值模拟  

Numerical Simulation of Shrinkage Porosity Defects in Rejoined Casting of Single Crystal Superalloy

作　　者：霍苗 李思晨 张鹏 赵惠 白欣鑫 HUO Miao;LI Sichen;ZHANG Peng;ZHAO Hui;BAI Xinxin(School of Materials Science and Engineering,Xi'an Shiyou University,Xi'an 710065,China;Shaanxi Yulin Energy Group Co.,Ltd.,Yulin 719000,China)

机构地区：[1]西安石油大学材料科学与工程学院,陕西西安710065 [2]陕西榆林能源集团有限公司,陕西榆林719000

出　　处：《热加工工艺》2023年第17期59-62,共4页Hot Working Technology

基　　金：陕西省自然科学基础研究计划项目(2021JQ-604,2021JM-403);陕西省教育厅科研计划项目(21JC027);西安市科技计划项目(2020KJ RC0100);西安石油大学大学生创新创业训练计划资助项目(S202010705121)。

摘　　要：采用ProCAST有限元模拟软件对镍基单晶高温合金对接结构铸件内缩松缺陷的形成进行了数值模拟研究。结果表明,铸件内缩松缺陷主要出现在对接平台的最后凝固区,其形成主要受两方面因素影响:一是铸件几何结构的影响,狭窄的对接平台不利于金属液补缩,在平台位置处,已凝固金属会堵塞后续凝固合金的补缩通道;二是抽拉速率的影响,随着抽拉速率的增大,凝固界面的“下凹”程度增加,金属液补缩难度增大,缩松缺陷的范围和数量均增加。By using finite element simulation software ProCAST,the formation of shrinkage porosity in the rejoined castings of Ni-based single crystal superalloy was investigated.The results show that the shrinkage porosity defects mainly appear in the last solidification zone of the rejoined platforms.Their formation are mainly affected by two factors.The one is the geometric structure of the casting,and the narrow rejoined platforms are not conducive to the liquid metal feeding.The early solidification metal will block the feeding channel of the subsequent solidification alloy at the platform.The other factor is the withdrawal rate.With the withdrawal rates increasing,the concave degree of solidification interface increases,the feeding is more difficult,and the formation range and number of shrinkage porosity increase simultaneously.

关 键 词：镍基单晶高温合金 PROCAST软件 缩松 

分 类 号：TG245[金属学及工艺—铸造]