摘要
IC10定向凝固高温合金具有典型的各向异性特征,在航空发动机及燃气轮机涡轮叶片选材应用时,需重点考虑其各向异性对其高温长时服役性能的影响。通过在IC10合金铸板上沿横向和纵向两个方向切取试样,结合涡轮叶片服役情况,选取典型温度(980℃)下的系列应力组合(110/140/160/180MPa)开展持久蠕变性能试验研究,对比横纵向取向差异对合金持久寿命和蠕变性能的影响,并结合断口形貌进行对比分析。试验结果表明,在980℃下,随着试验应力的升高,横纵取样的持久寿命均大幅降低,合金在该温度下对应力敏感;在同等应力条件下,纵向取样的蠕变寿命、稳态蠕变速率和以断裂应变为代表的蠕变塑性均要高于横向取样,显著体现了横纵取向持久蠕变性能的各向异性;横纵向取样试验后的断口形貌存在明显差异,具有不同的蠕变变形和破断机制。
IC10 directional solidification superalloy has typical anisotropic characteristics.It's necessary to focus on the influence of anisotropy on the high-temperature long-term service performance of IC10 alloy during the material selection for aircraft engines and gas turbine blades.Combing with the service conditions of turbine blades,a series of stress combinations(110/140/160/180MPa)were selected at a typical temperature(980℃)to conduct creep endurance performance tests by cutting samples in both the transverse and longitudinal directions on IC10 alloy plates.The effects of transverse and longitudinal orientation differences on the stress rupture life and creep performance of the alloy were compared,and the fracture morphology was analyzed and contrasted.The results shows that the stress rupture life of both transverse and longitudinal samples decreases significantly with the increase of test stress at 980℃,which indicating that the alloy is sensitive to stress at this temperature.The rupture life,steady-state creep rate and creep plasticity represented by fracture strain of longitudinal samples are higher than those of transverse samples,which reflect the significantly anisotropy of the creep performance in the transverse and longitudinal orientations.And there are significant differences in the fracture morphology after tests between the transverse and longitudinal samples,which owning different creep deformation and fracture mechanisms.
作者
董自超
马燕妮
王威
李莹
孟令琪
DONG Zi-chao;MA Yan-ni;WANG Wei;LI Ying;MENG Ling-qi(AECC Shenyang Engine Research Institute,Shenyang 110015,China;Army Artillery and Air Defense Academy Sergeant School,Shenyang 110000,China)
出处
《汽轮机技术》
北大核心
2025年第6期477-480,470,共5页
Turbine Technology
