Fractal Analysis of the Effect of Grain Boundary Character on Te-Induced Brittle Cracking in GH3535 Alloy

doi:10.11900/0412.1961.2021.00584

Acta Metall Sin

2023, Vol. 59

Issue (2): 248-256 DOI: 10.11900/0412.1961.2021.00584

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Fractal Analysis of the Effect of Grain Boundary Character on Te-Induced Brittle Cracking in GH3535 Alloy

YANG Du¹, BAI Qin¹(

), HU Yue¹, ZHANG Yong¹, LI Zhijun², JIANG Li², XIA Shuang¹, ZHOU Bangxin¹

1.Institute of Materials, Shanghai University, Shanghai 200072, China
2.Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China

Cite this article:

YANG Du, BAI Qin, HU Yue, ZHANG Yong, LI Zhijun, JIANG Li, XIA Shuang, ZHOU Bangxin. Fractal Analysis of the Effect of Grain Boundary Character on Te-Induced Brittle Cracking in GH3535 Alloy. Acta Metall Sin, 2023, 59(2): 248-256.

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Abstract

GH3535 alloy has been used as the main structural material of molten salt reactor, which exhibits good high-temperature strength and excellent corrosion resistance to the molten salts. The intergranular cracking of GH3535 was detected after four years of operation of the molten salt reactor experiment, which was attributed to the inward diffusion of fission products Te. Grain boundary engineering (GBE) has been successfully applied to enhance the grain-boundary-related properties of the materials by increasing the frequency of low Σ coincidence site lattice grain boundaries and tailoring the grain boundary network. The in situ three-point bending test was used to assess the cracking properties of Non-GBE and GBE samples following Te infiltration at 700^oC for 500 h. Fractal analysis statistics of various types of grain boundaries and cracks following in situ three-point bending tests were used. The result shows that the fractal dimension of cracks is in accord with that of the random grain boundaries (RGBs). The stronger the fracture resistance of materials, the lower the value of the RGB fractal dimension. The GH3535 alloy GBE samples with a bigger average size and more uniformly distributed twin grain clusters will have greater cracking resistance.

Key words: GH3535 alloy grain boundary engineering three-point bending crack fractal dimension

Received: 27 December 2021

ZTFLH:

TG174.1

Fund: National Key Research and Development Program of China(2018YFE0122100);National Natural Science Foundation of China(51871144)

About author: BAI Qin, associate professor, Tel: 18019370515, E-mail: baiqin31@shu.edu.cn

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	Du YANG
	Qin BAI
	Yue HU
	Yong ZHANG
	Zhijun LI
	Li JIANG
	Shuang XIA
	Bangxin ZHOU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2021.00584 OR https://www.ams.org.cn/EN/Y2023/V59/I2/248

Fig.1 Schematic of the fractal dimension of the grain boundary by the box counting method (η—square box size)

Fig.2 Orientation image microscopy (OIM) maps of different types of grain boundaries in Non-GBE (NS) (a) and GBE (GS) (b) specimens (GBE—grain boundary engineering, RGB—random grain boundary)

Table 1 Grain boundary character distribution (GBCD), and statistics of mean dimensions of grains and grain-clusters of NS and GS specimens

Fig.3 OIM maps of different types of grain boundaries (a-e) and corresponding SEM images of cracks (f-j) of NS-1 (a, f), NS-2 (b, g), NS-3(c, h), NS-4 (d, i), and NS-5 (e, j) observation regions in NS specimen

Fig.4 OIM maps of different types of grain boundaries (a-e) and corresponding SEM images of cracks (f-j) of GS-1 (a, f), GS-2 (b, g), GS-3(c, h), GS-4 (d, i), and GS-5 (e, j) observation regions in GS specimen

Fig.5 Histogram of GBCD of obsearvation regions in NS (a) and GS (b) specimens

Fig.6 Histogram of the fractal dimension of different types of grain boundaries and cracks in NS (a) and GS (b) specimens

Fig.7 OIM map of different types of grain boundaries (a) and corresponding SEM image (b) of NS specimen

Fig.8 OIM map of different types of grain boundaries (a) and corresponding SEM image (b) of GS specimen

Fig.9 Maps of grain area distribution in NS (a) and GS (b) specimens

Fig.10 Histogram of the fractal dimension of twin grain cluster (GC) and non twin grain cluster (NGC) regions in NS (a) and GS (b) specimens

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