Effect of Secondary Orientation on Oxidation Anisotropy Around the Holes of Single Crystal Superalloy During Thermal Fatigue Tests

doi:10.11900/0412.1961.2019.00109

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	Effect of Secondary Orientation on Oxidation Anisotropy Around the Holes of Single Crystal Superalloy During Thermal Fatigue Tests
	Wang Li 1; He Yufeng 1,2; Shen Jian 1; Zheng Wei 1; Lou Langhong 1; Zhang Jian 1
刊名	ACTA METALLURGICA SINICA
	2019-11-11
卷号	55 期号:11 页码:1417-1426
关键词	single crystal superalloy secondary orientation thermal fatigue oxidation anisotropy
ISSN号	0412-1961
DOI	10.11900/0412.1961.2019.00109
通讯作者	Wang Li(wangli@imr.ac.cn)
英文摘要	With 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.
资助项目	National 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研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000492725000007
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/136913]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wang Li
作者单位	1.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
推荐引用方式 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.