铸造技术2026，Vol.47Issue(8)：879-887,9.DOI:10.16410/j.issn1000-8365.2026.5278
热暴露对DD10单晶高温合金组织稳定性的影响
Effect of Thermal Exposure on the Microstructure Stability of DD10 Single-crystal Superalloy
摘要
Abstract
In critical components such as aircraft engines,the performance and stability of high-temperature alloys directly impact component safety and efficiency.Through long-term thermal exposure experiments conducted at 700 and 1 100℃on fully heat-treated DD10 single-crystal superalloys,this study systematically investigated the volume fraction,morphological characteristics,and evolution mechanisms of the γ'strengthening phase(size,morphology,distribution)and topologically close-packed(TCP)phases under different aging temperatures and durations.The results indicate that during 700℃ thermal exposure,only slight coarsening of the γ'phase occurs along the dendrite trunks and interdendritic regions,with no TCP phase precipitation detected.As the thermal exposure temperature increases to 1 100℃,the morphology of the γ'phase in the alloy significantly changes.After 200 h of thermal exposure at 1 100℃,the γ'phase morphology transforms from a regular cubic configuration to an irregular form,resulting in the formation of a rafted structure.With prolonged thermal exposure time,the rafted structure gradually coarsens.Additionally,with increasing temperature,the segregation of refractory elements induces the precipitation of the p phase.During thermal exposure at 700 and 1 100℃,the difference in the lattice constant between the γ and γ'phases decreases with increasing temperature,and the absolute value of the degree of misfit between the two phases also diminishes accordingly.After 200 h of thermal exposure at 700℃,the degree of misfit is slightly greater than that in the as-heat-treated state,and the cubicity of the γ'phase reaches its maximum at this point.关键词
镍基单晶高温合金/热暴露/γ'相/TCP相Key words
nickel-based single-crystal superalloy/thermal exposure/γ'phase/TCP phase分类
矿业与冶金引用本文复制引用
马秀林,黄太文,许佳圣,刘丽君,曹腊梅,苏海军,刘林..热暴露对DD10单晶高温合金组织稳定性的影响[J].铸造技术,2026,47(8):879-887,9.基金项目
重点新材料研发及应用国家科技重大专项(2025ZD0608601) （2025ZD0608601）
国家科技重大专项(J2019-Ⅶ-0013-0153,2019-Ⅵ-0020-0135) （J2019-Ⅶ-0013-0153,2019-Ⅵ-0020-0135）
航空发动机及燃气轮机基础科学中心项目(P2021-A-Ⅳ-001-001) （P2021-A-Ⅳ-001-001）
陕西省科技计划项目(2021TD-17) （2021TD-17）
