航空材料学报2025，Vol.45Issue(2)：45-52,8.DOI:10.11868/j.issn.1005-5053.2024.000128
高温循环载荷对DZ411合金γ'相演变行为的影响
Effect of high temperature cyclic loading on γ' phase evolution behavior of DZ411 alloy
摘要
Abstract
Optical microscopy(OM)and scanning electron microscopy(SEM)methods are employed to investigate the effect of various load conditions—including a constant load of 200 MPa,an average stress of 200 MPa with a stress amplitude of 130 MPa,and an average stress of 150 MPa with a stress amplitude of 130 MPa—on the microstructural evolution of DZ411 alloy.The experimental findings reveal that the dendrite structure remains relatively unchanged under high temperatures and stress conditions.When compared to a constant load,DZ411 alloy subjected to cyclic loading exhibits a reduced number of interdendritic pores,which are also smaller in size.In the absence of loading,the γ' phase undergoes rafting to form a sheet-like structure.Notably,cyclic loading exhibits a more pronounced promotion effect on the rafting growth process of the γ'phase than directional constant loading.Additionally,cyclic loading facilitates the merging and growth of small γ'phase particles,leading to the formation of longer sheet structures as more γ'phases become interconnected.Furthermore,under cyclic loading,the size and morphological differences among γ'phase particles become more pronounced.关键词
DZ411定向凝固高温合金/循环加载/γ'相/断裂Key words
DZ411 directional solidification superalloy/cyclic loading/γ'phase/fracture分类
航空航天引用本文复制引用
郑五岳,智一恒,周彤彤,曹铁山,程从前,赵杰..高温循环载荷对DZ411合金γ'相演变行为的影响[J].航空材料学报,2025,45(2):45-52,8.基金项目
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）
船用燃气轮机基础研究项目(MGT2023001) （MGT2023001）
国家自然科学基金项目(51901035) （51901035）
