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Effect of Secondary Orientation on Oxidation Anisotropy Around the Holes of Single Crystal Superalloy During Thermal Fatigue Tests
Wang Li1; He Yufeng1,2; Shen Jian1; Zheng Wei1; Lou Langhong1; Zhang Jian1
Corresponding AuthorWang Li(wangli@imr.ac.cn)
2019-11-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume55Issue:11Pages:1417-1426
AbstractWith the increase of inlet temperatures of the aeroengines, high generation single crystal superalloys were used widely, and more and more complicated structures were employed. Thermal fatigue cracks around the cooling holes were reported to be one of the most important failure mechanisms. In this work, the thermal fatigue behaviors of a third generation single crystal superalloy with different secondary orientations were studied and the effect of secondary orientation on oxidation behaviors around the cooling holes during thermal fatigue tests of samples was investigated by OM, SEM and EDS. The results showed that no cracks was found around the holes even after 560 cyc thermal fatigue tests for both (100) and (110) specimens. But the oxidation behaviors around the holes were different for samples with different secondary orientations, and oxidation layers with different thicknesses were observed around each hole. After 1 cyc thermal fatigue test, the average thickness of oxidation layer around the (110) specimens was almost the same as that of the (100) specimens. After 20 cyc thermal fatigue test, thicker oxidation layers were detected in (110) specimens than that in (100) specimens. Larger difference was observed with the ongoing of the thermal fatigue tests. After 560 cyc, the average oxidation thickness is round 137 mu m for (110) specimens, while it is only 88 mu m for (100) specimens. Furthermore, the oxidation layer shows different thickness at the different positions of a hole. For (100) specimens, the thickness of oxidation layer decreases in the sequences of [010], [011] and [001] direction, while for (110) specimens it decreases in the sequences of [110], [112] and [001] direction. It was discussed based on the combined effect of thermal stress anisotropy of the sample and local thermal stress anisotropy around the holes, which were caused by crystal anisotropy of single crystals, and the different microstructures around the holes.
Keywordsingle crystal superalloy secondary orientation thermal fatigue oxidation anisotropy
Funding OrganizationNational Natural Science Foundation of China
DOI10.11900/0412.1961.2019.00109
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51671196] ; National Natural Science Foundation of China[51871210] ; National Natural Science Foundation of China[51631008] ; National Natural Science Foundation of China[91860201]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000492725000007
PublisherSCIENCE PRESS
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/136914
Collection中国科学院金属研究所
Corresponding AuthorWang Li
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Liaoning, Peoples R China
Recommended Citation
GB/T 7714
Wang Li,He Yufeng,Shen Jian,et al. Effect of Secondary Orientation on Oxidation Anisotropy Around the Holes of Single Crystal Superalloy During Thermal Fatigue Tests[J]. ACTA METALLURGICA SINICA,2019,55(11):1417-1426.
APA Wang Li,He Yufeng,Shen Jian,Zheng Wei,Lou Langhong,&Zhang Jian.(2019).Effect of Secondary Orientation on Oxidation Anisotropy Around the Holes of Single Crystal Superalloy During Thermal Fatigue Tests.ACTA METALLURGICA SINICA,55(11),1417-1426.
MLA Wang Li,et al."Effect of Secondary Orientation on Oxidation Anisotropy Around the Holes of Single Crystal Superalloy During Thermal Fatigue Tests".ACTA METALLURGICA SINICA 55.11(2019):1417-1426.
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