铸造2025，Vol.74Issue(7)：950-959,10.
V与Hf对一种镍基高温合金组织及性能影响
Effect of V and Hf on Microstructure and Properties of DD26 Nickel-Based Superalloy
摘要
Abstract
The effects of V and Hf elements on the microstructure and properties of the first generation nickel-based single crystal superalloy(DD26)were studied by optical microscope,scanning electron microscope,thermal analyzer and electronic material testing machine.The Nv values of DD26Hf and DD26V are 2.10 and 2.38,respectively.As-cast structure of DD26V alloy has slightly larger primary dendrite spacing and slightly higher carbide and eutectic content.The eutectic in solid solution DD26Hf basically disappears,but there is still a whiteboard eutectic in DD26V,and a large number of needle-like phases are precipitated.The size of γ'phase in heat-treated DD26Hf is smaller.At room temperature,the fracture type is quasi-cleavage fracture.Carbide is the crack source of both alloys,but in DD26V alloy,the crack propagates along or through the acicular phase,forming the fracture morphology of many cleavage steps.In DD26Hf,it cracks along carbide,forming fishbone-like morphology.The precipitation of needle phase leads to that the yield strength of DD26V alloy is less than that of DD26Hf alloy,but the tensile strength is slightly higher.Adding excessive V element to form acicular phase and residual eutectic leads to that the medium-temperature and high-temperature durability of DD26V alloy is less than that of DD26Hf alloy.关键词
单晶高温合金DD26/显微组织/力学性能/持久性能/针状相Key words
single crystal superalloy DD26/microstructure/mechanical properties/durable performance/needle phase分类
矿业与冶金引用本文复制引用
李红海,申健,卢玉章,郑伟,张振波,武颖娜,黄亚奇..V与Hf对一种镍基高温合金组织及性能影响[J].铸造,2025,74(7):950-959,10.基金项目
重点研发计划(2022YFB3705000) （2022YFB3705000）
中国科学院金属研究所创新基金(2024-PY04) （2024-PY04）
辽宁省科学技术计划(2022JH2/101300226) （2022JH2/101300226）
国家自然科学基金项目(52271042、U2141206和U2241283). （52271042、U2141206和U2241283）
