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

Acta Metall Sin

2019, Vol. 55

Issue (11): 1417-1426 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 Li¹(

),HE Yufeng^1,²,SHEN Jian¹,ZHENG Wei¹,LOU Langhong¹,ZHANG Jian¹

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

Cite this article:

WANG Li,HE Yufeng,SHEN Jian,ZHENG Wei,LOU Langhong,ZHANG Jian. Effect of Secondary Orientation on Oxidation Anisotropy Around the Holes of Single Crystal Superalloy During Thermal Fatigue Tests. Acta Metall Sin, 2019, 55(11): 1417-1426.

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Abstract

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 μm for (110) specimens, while it is only 88 μm 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.

Key words: single crystal superalloy secondary orientation thermal fatigue oxidation anisotropy

Received: 10 April 2019

ZTFLH:

TG146.1

Fund: 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)

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	Li WANG
	Yufeng HE
	Jian SHEN
	Wei ZHENG
	Langhong LOU
	Jian ZHANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00109 OR https://www.ams.org.cn/EN/Y2019/V55/I11/1417

Fig.1 Schematics of thermal fatigue samples with different secondary orientations(a) (100) specimen (b) (110) specimen

Fig.2 Transverse microstructures of DD33 superalloy with different secondary orientations after full heat treatment(a, c) (100) specimen (b, d) (110) specimen

Fig.3 Morphology of a hole in (100) specimen (a) and detail view of the rectangular region in Fig.3a showing the recast layer around the hole (b) after electro-discharge machining

Fig.4 Microstructure evolutions around holes in (100) specimen (a, c, e, g) and (110) specimen (b, d, f, h) during room temperature to 1100 ℃ thermal fatigue tests(a, b) 1 cyc (c, d) 20 cyc (e, f) 220 cyc (g, h) 560 cyc

Fig.5 Oxidation layer around the holes in (110) specimen after 220 cyc thermal fatigue tests(a) secondary electron (SE) image (b) back scattered electron (BSE) image

Fig.6 SEM image (a), line scan spectra along AB (b) and element distributions of the area CDEF (c~k) of the oxidation layer around a hole in (100) specimen after 560 cyc thermal fatigue testColor online

Fig.7 Changes of oxidation distance relative to the hole center (a, b) and thickness of oxidation layer (c, d) of (100) specimen (a, c) and (110) specimen (b, d) during thermal fatigue tests

Fig.8 Schematics showing the thermal stress around the holes (a, d) and the oxidation layers around the holes during 220 cyc (b, e) and 560 cyc (c, f) thermal fatigue tests of (100) specimens (a~c) and (110) specimens (d~f)Color online

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