航空材料学报2025，Vol.45Issue(5)：93-101,9.DOI:10.11868/j.issn.1005-5053.2025.000119
温度梯度对Ni3Al基单晶高温合金蠕变行为的影响
Creep behavior of a Ni3Al single crystal superalloy under thermal gradient conditions
张曾凯 1孙家正 1尚勇 1裴延玲 1宫声凯1
作者信息
- 1. 北京航空航天大学材料科学与工程学院,北京 100191
- 折叠
摘要
Abstract
Traditionally,the creep performance of superalloys are characterized under isothermal and constant-stress conditions.However,in the service environments of aero-engines,internal cooling introduces notable through-thickness temperature gradients within turbine blade materials.Consequently,examining the creep behavior of single-crystal alloys under such temperature gradients holds considerable engineering significance.This study conducts a series of temperature-gradient creep experiments based on a Ni3Al-based superalloy.Temperature gradients of 105 K/m and 5×104 K/m are imposed.The results indicate that temperature gradients exert a substantial influence on specimens creep rupture life.Specifically,compared to isothermal creep,the application of a 105 K/m gradient leads to an almost 46%extension in creep life,whereas a 5×104 K/m gradient results in about 30%improvement.Fractographic and microstructural analyses reveal enhanced anisotropy on the fracture surface under temperature gradients.Furthermore,the oxidation behavior varies markedly across different temperature zones:the high-temperature region exhibits a denser,thinner oxide layer,whereas the low-temperature region displays a porous,thicker oxide layer.In the 105 K/m gradient specimen,the low-temperature area exhibits a rafted γ′ structure,while the high-temperature area shows a de-rafted morphology,suggesting differing strain rates between these regions.关键词
温度梯度/单晶高温合金/镍基高温合金/蠕变Key words
thermal gradient/single crystal superalloy/nickel-based superalloy/creep分类
航空航天引用本文复制引用
张曾凯,孙家正,尚勇,裴延玲,宫声凯..温度梯度对Ni3Al基单晶高温合金蠕变行为的影响[J].航空材料学报,2025,45(5):93-101,9.
