航空材料学报2025，Vol.45Issue(5)：102-111,10.DOI:10.11868/j.issn.1005-5053.2024.000084
DD10单晶合金高温持久断裂损伤特征及薄壁效应
High-temperature stress rupture damage characteristics and thin-wall effect of DD10 single crystal alloy
摘要
Abstract
Stress rupture tests are conducted on DD10 alloy specimens with two distinct wall thicknesses at conditions of 1000℃/200 MPa and 1100℃/100 MPa.The stress damage characteristics of these specimens and the reasons for the thin-wall effect are analysisd.The findings reveal that,under both test conditions,the stress rupture life of thinner specimens is markedly shorter compared to thicker ones,indicating a pronounced thin-wall effect in DD10 alloy.Although the reduction in effective bearing area due to oxidation does expedite the creep process to some extent,the variation in effective stress increase across different wall thicknesses is minimal,within a range of just 6%.This suggests that the augmentation in effective stress stemming from oxidation is not the primary catalyst behind the thin-wall effect.Microstructural observations of the surface and longitudinal sections of the fracture reveal that,under both test conditions,the cavities and cracks in thinner specimens are smaller in size than those in thicker specimens.Furthermore,the relationship between the stress intensity factor(K)and crack length(l)indicates that,for cracks of equivalent size in specimens with varying wall thicknesses,thinner specimens exhibit a higher stress intensity factor at the crack tip,rendering the crack more prone to propagation.Consequently,thinner specimens have a shorter critical size for crack instability expansion.The disparity in this critical size among specimens with different wall thicknesses is pinpointed as a crucial factor contributing to the thin-wall effect.关键词
镍基单晶高温合金/持久断裂/损伤/薄壁效应Key words
nickel-based single crystal superalloy/stress rupture/damage/thin-wall debit分类
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吴佳慧,曹铁山,许巍,陈家万,曹腊梅,张悦,程从前,赵杰..DD10单晶合金高温持久断裂损伤特征及薄壁效应[J].航空材料学报,2025,45(5):102-111,10.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）
