摘要
利用ProCAST有限元分析软件对大高径比K417镍基高温合金铸锭充型及凝固过程进行数值模拟,模拟研究了合金锭在凝固过程中其二次缩孔缺陷形成位置、数量和成因,及浇注温度和浇注速度对二次缩孔缺陷的影响,并进行了试验验证。结果表明:数值模拟得到的合金缩孔缺陷分布与实际生产的合金锭缺陷分布趋势一致,证明了数值模拟结果的准确性。提高浇注温度、降低浇注速度能在一定程度上抑制合金锭二次缩孔缺陷的形成,但无法完全消除缺陷,在1 530℃、浇注速度1.40 kg·s条件下,合金锭的缩孔缺陷最少。
ProCAST finite element analysis software was used to numerically simulate the filling and solidification process of K417 nickel-based superalloy ingot with large height-diameter ratio. The location, quantity and cause of the formation of secondary shrinkage defects in the solidification process of the alloy ingot, and the influence of pouring temperature and pouring speed on secondary shrinkage defects was simulated and studied, and were verified by experiments. The results show that the shrinkage defect distribution of alloy ingot obtained by numerical simulation was consistent with that of onsite casting ingot, indicating the accuracy of numerical simulation. The secondary shrinkage defects could be mitigated by increasing the pouring temperature and decreasing the pouring speed to some extent.However,the defects could not be completely eliminated.Under the condition of 1 530 ℃and 1.40 kg·spouring speed,the alloy ingots had the fewest shrinkage defects.
作者
谭庆彪
王博
董鸿志
汪东红
祝国梁
TAN Qingbiao;WANG Bo;DONG Hongzhi;WANG Donghong;ZHU Guoliang(Shanghai Key Lab of Advanced High-Temperature Materials and Precision Forming,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Longda Superalloy Aviation Materials Co.,Ltd.,Wuxi 214104,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2022年第9期64-69,共6页
Materials For Mechanical Engineering
基金
航空发动机及燃气轮机重大专项基础研究项目(2017-Ⅵ-0013-0085)
国家自然科学基金资助项目(51821001)。
关键词
铸造镍基高温合金
浇注工艺
大高径比
二次缩孔缺陷
数值模拟
cast nickel-base superalloy
pouring process
large height to diameter ratio
secondary shrinkage cavity
numerical simulation
