高γ′含量高温合金整体细晶叶盘铸造凝固行为和组织特征模拟研究  

Simulation of Casting Solidification Behavior and Microstructure Characteristics of High γ′ Content Superalloy Fine Grain Blisk

作　　者：马祎炜 姚志浩[1] 李大禹 刘梦飞 董建新[1] 盖其东[2] Ma Yiwei;Yao Zhihao;Li Dayu;Liu Mengfei;Dong Jianxin;Gai Qidong(School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China;Key Laboratory of Advanced High Temperature Structural Materials,Beijing Institute of Aeronautical Materials,Beijing 100095,China)

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]北京航空材料研究院先进高温结构材料重点实验室,北京100095

出　　处：《稀有金属材料与工程》2022年第12期4519-4526,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51771017)。

摘　　要：使用ProCAST软件模拟热控法细晶整体叶盘的铸造,将传统的Udimet720Li变形高温合金作为整体叶盘铸造材料,模拟整体叶盘的凝固过程、孔隙率分布、应力分布和晶粒生长情况,研究该高γ′含量高温合金用于细晶整体叶盘铸造的凝固行为和组织特征。整体叶盘的凝固始于叶片尖端,结束于冒口中心位置。整体叶盘的主体区域孔隙率为1.5%~3%,凝固过程中由于缩松偏聚,部分区域会形成孔隙率相对较大的区域。确立评估该材料整体叶盘铸件孔隙缺陷的安全阈值为13 (K·s)^(1/2)/cm,用于评估铸造工艺参数的可行性。整体叶盘各位置的最大切应力、有效塑性应变和热裂指数均为0,但在叶片尖端和边缘棱角区域存在有效应力大于1200 MPa的应力集中现象。整体叶盘平均晶粒尺寸为0.88 mm,满足热控法应达到的水平,但热控法不易控制晶粒度的均匀性,更应该结合动力学方法,提高晶粒度的均匀性。ProCAST software was used to simulate the casting of fine grain blisk by thermal controlled. Traditional Udimet720Li deformed superalloy was used as the casting material of blisk to simulate the solidification process, porosity distribution, stress distribution and grain growth of blisk. The solidification behavior and microstructure characteristics of the high γ’ superalloy used in fine grain blisk casting were studied. The results show that the solidification of the blisk begins at the blade tip and ends at the center of riser.The porosity of the main area of the blisk is 1.5%~3%. In the solidification process, due to the shrinkage and segregation, some areas will form relatively large porosity areas. A safety threshold of 13(K·s)^(1/2)/cm was established to evaluate the feasibility of casting process parameters. The maximum shear stress, effective plastic strain and hot crack index at each position of the blisk are 0, but the effective stress is more than 1200 MPa in the blade tip and edge corner area. The average grain diameter of the blisk is 0.88 mm, which meets the requirement of thermal control method. However, thermal control method is not easy to control the uniformity of grain size, so it should be combined with kinetic method to improve the uniformity of grain size.

关 键 词：PROCAST 热控法 整体细晶叶盘 Udimet720Li 

分 类 号：TG132.33[一般工业技术—材料科学与工程]