Formation and Evolution of Low Angle Grain Boundary in Large-Scale Single Crystal Superalloy Blade

doi:10.11900/0412.1961.2019.00090

Acta Metall Sin

2019, Vol. 55

Issue (12): 1527-1536 DOI: 10.11900/0412.1961.2019.00090

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Formation and Evolution of Low Angle Grain Boundary in Large-Scale Single Crystal Superalloy Blade

XIE Guang(

),ZHANG Shaohua,ZHENG Wei,ZHANG Gong,SHEN Jian,LU Yuzhang,HAO Hongquan,WANG Li,LOU Langhong,ZHANG Jian

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

XIE Guang, ZHANG Shaohua, ZHENG Wei, ZHANG Gong, SHEN Jian, LU Yuzhang, HAO Hongquan, WANG Li, LOU Langhong, ZHANG Jian. Formation and Evolution of Low Angle Grain Boundary in Large-Scale Single Crystal Superalloy Blade. Acta Metall Sin, 2019, 55(12): 1527-1536.

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Abstract

Ni-based single crystal (SX) superalloys are widely used for production of blades in gas turbines and aircraft engines for their superior mechanical performance at high temperatures. In this work, the formation and evolution of low angle grain boundary (LAGB) of a SX blade during directionally solified (DS) process were investigated by EBSD and XCT. It indicated that the alignment of dendrites was deteriorated with the increasing of the height along the growth direction during the DS process of SX blade. LAGBs were found in the SX blade. The misorientation angle and the frequency of LAGB were obviously enhanced with the increasing of the distance away from the initiated location of LAGB. Crystal orientation measurements showed that the orientation distribution of dendrites in the extended zone was concentrated, while the dispersion of dendrite orientation in the blade body increased, but it was still around that of the extended zone. The reason for the formation of LAGB may be related to the shell hindering the melt shrinkage which resulted in the production of the force and then led to the rotation of secondary dendrites. Larger size voids on the surface would be beneficial to the formation of LAGB. In addition, it was found that dendrites with the orientation approching [001] eliminated the stray grains between them and impinged to form LAGB.

Key words: large-scale single crystal superalloy blade low angle grain boundary dendrite orientation XCT

Received: 01 April 2019

ZTFLH:

TG156.1

Fund: National Natural Science Foundation of China(Nos.51771204);National Natural Science Foundation of China(U1732131);National Natural Science Foundation of China(51911530154);National Natural Science Foundation of China(51671196);National Natural Science Foundation of China(91860201);National Natural Science Foundation of China(51631008);National Science and Technology Major Project(No.2017-VII-0008-0101)

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	Articles by authors
	XIE Guang
	ZHANG Shaohua
	ZHENG Wei
	ZHANG Gong
	SHEN Jian
	LU Yuzhang
	HAO Hongquan
	WANG Li
	LOU Langhong
	ZHANG Jian

URL:

https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00090 OR https://www.ams.org.cn/EN/Y2019/V55/I12/1527

Fig.1 Schematic of samples cutting in the large scale single crystal superalloy blade (unit: mm)

Fig.2 Microstructures in the extended region of single crystal superalloy blade(a) transversal section (b) magnification of transversal section (c) longitudinal section

Fig.3 Microstructures in the tenon region of single crystal superalloy blade(a) transversal section (b) magnification of transversal section (c) longitudinal section

Fig.4 Microstructures in the blade body of single crystal superalloy blade (The arrows in Fig.4b show the relative rotation of dendrites)(a) transversal section (b) magnification of transversal section (c) longitudinal section

Fig.5 Distribution of orientation in the extended region and the blade body (Black and gray points are the orientations of the extended region and the blade body, respectively)

Fig.6 Distributions of low angle grain boundary along the transversal direction in the middle of the extended region (a) and near the shell (b) of the single crystal superalloy blade

Fig.7 Distribution of low angle grain boundary along the transversal direction in the blade body

Fig.8 Frequency of occurrence of low angle grain boundary in the extended region and blade body

Fig.9 Distribution of voids (a) and morphology of dendrites in the longitudinal section of the sample (b) (Inset in Fig.9b shows the schematic of dendrites in the circle; θ is the angle between the original dendrite and misaligned dendrite; the circles indicate the same regions with the morphology of voids in Fig.9a and dendrites in Fig.9b)

Fig.10 Morphologies of dendrites in the sections of 0 μm (a), 50 μm (b), 120 μm (c) and 1370 μm (d) away from the initial site of sample, respectively (The black and the white crosses indicate the orientation of original dendrites and misaligned dendrites)

Fig.11 Distribution of orientation at the site which is about 5 mm from the initial site of low angle grain boundary along the upward growth direction

Fig.12 Morphology of grain growth in the starter block (a) and marks of grains (grain boundary) (b)

Fig.13 Distribution of grains in Fig.12 (I, II and III are grain I, grain II and stray grain III in Fig.12, respectively)

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