铸造2025，Vol.74Issue(7)：939-949,11.
Ta对一种镍基单晶高温合金组织和持久性能的影响
Effects of Ta Element on Microstructure and Stress Rupture Property of a Ni-Based Single Crystal Superalloy
摘要
Abstract
Based on a Ni-based single crystal superalloy,two kinds of 0Ta and 3.5Ta alloys were designed.By using optical microscopy(OM)and scanning electron microscopy(SEM),the effects of Ta element on the as-cast and heat-treated microstructures were investigated,and appropriate heat treatment regime was confirmed according to the microstructures.Finally,the effects of Ta on the stress rupture properties were analyzed.The results indicate that,compared with the 0Ta alloy,the primary dendrite spacing grows by 36.5 μm,the γ/γ'eutectic content is increased by 3 times,and the solution heat treatment window is narrowed greatly for the as-cast 3.5Ta alloy.After raising temperature slowly from 1 280 ℃ to 1 325 ℃ and 1 330 ℃,respectively,and holding for 4 h for the two alloys,the dendritic segregations are not obvious,the eutectics are completely eliminated,and no incipient melting occurs.However,there are more micropores formed during solution treatment at 1 330 ℃ for the 3.5Ta alloy.The final heat treatment process is determined as follows ℃ 1 280 ℃ 0.1℃/min→1 325 ℃/4 h,air cooling(AC)→1 150 ℃/4 h,AC→870 ℃/24 h,AC.After heat treatment,the stress rupture life of 3.5Ta alloy tested under 760 ℃/810 MPa is about 2 times of that of 0Ta alloy,but the elongation after fracture is lower than that of 0Ta alloy.关键词
单晶高温合金/Ta/热处理/显微组织/持久性能Key words
single crystal superalloy/Ta/heat treatment/microstructure/stress rupture property分类
矿业与冶金引用本文复制引用
李亚微,葛志成,谢光,黄亚奇,卢玉章..Ta对一种镍基单晶高温合金组织和持久性能的影响[J].铸造,2025,74(7):939-949,11.基金项目
航空发动机及燃气轮机基础科学中心项目(P2022-C-Ⅳ-001-001) （P2022-C-Ⅳ-001-001）
国家自然科学基金项目(52271042、U2141206和U2241283) （52271042、U2141206和U2241283）
中国科学院依托重大科技基础设施的建制化科研项目(JZHKYPT-2021-01). （JZHKYPT-2021-01）
