Chromium Concentration Near Grain Boundaries with Various Characters in Inconel Alloy 600

doi:10.11901/1005.3093.2019.509

Chinese Journal of Materials Research

2020, Vol. 34

Issue (7): 511-517 DOI: 10.11901/1005.3093.2019.509

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Chromium Concentration Near Grain Boundaries with Various Characters in Inconel Alloy 600

ZHENG Hefeng, SHI Mengjie, MAO Qiang, ZHANG Mengchao, LI Hui(

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Key Laboratory for Microstructures, Shanghai University, Shanghai 200444, China

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ZHENG Hefeng, SHI Mengjie, MAO Qiang, ZHANG Mengchao, LI Hui. Chromium Concentration Near Grain Boundaries with Various Characters in Inconel Alloy 600. Chinese Journal of Materials Research, 2020, 34(7): 511-517.

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Abstract

The structure and morphology of carbides and the concentration of Cr near various type of grain boundaries of Inconel alloy 600 after aging treatment at 715℃ for different time were investigated by means of TEM, EDS and EBSD. The results show that there are obvious differences in structure and morphology of carbides precipitated at grain boundaries. Few carbides precipitated at Σ3_c grain boundary, irregular shape M₂₃C₆ carbides precipitated at Σ3_i grain boundary, and lager M₂₃C₆ carbide particles precipitated at Σ9 grain boundary. The coarse M₇C₃ carbide particles precipitated randomly at Σ27 grain boundaries. The precipitation of Cr-rich carbides causes Cr-depletion near the grain boundaries. Under the same aging conditions, the Cr-depletion is more severe near the grain boundaries of higher Σ value. The width of Cr-depletion zone near the grain boundary increases with the increase of aging time. However, the depth of Cr-depletion zone near the grain boundary reaches the maximum value after aging for 15 h, and then decreases to different degrees after aging for 50 h. Based on the experimental results the effect of grain boundary character on the carbide precipitation and Cr-depletion is discussed.

Key words: metallic materials carbide chromium depletion grain boundary character grain boundary engineering Inconel alloy 600

Received: 04 November 2019

ZTFLH:

TG14

Fund: National Key Research and Development Program of China(2016YFB0700401)

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	Hefeng ZHENG
	Mengjie SHI
	Qiang MAO
	Mengchao ZHANG
	Hui LI

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.509 OR https://www.cjmr.org/EN/Y2020/V34/I7/511

Fig.1 OIM maps of Alloy 600 samples (a) solution treated at 1100℃ for 15 min, (b) and then is cold-rolled 5%, recrystallized at 1100℃ for 5 min, and (c) grain boundary character distribution statistics (Palumbo-Aust criterion^[13], length fraction) of solution treatment and GBE treated samples

Fig.2 Preparing of TEM samples using focus ion beam technology. (a) OIM map of sample, (b) the corresponding SEM image of the Σ27 grain boundary indicated by the black circle in figure a, (c) cutting the slice containing this grain boundary, (d) milling to prepare the thin foil TEM sample containing this grain boundary

Fig.3 TEM analysis of carbide precipitated at grain boundaries with various characters in the samples aging at 715℃ for 2 h (The dashed line highlights the position of grain boundary) (a, b) Σ3_c grain boundary, (c, d) Σ3_i grain boundary, (e, f) Σ9 grain boundary, (g, h) Σ27 grain boundary, (i, j) Random grain boundary

Fig.4 Evolution of depletion zone in the samples aged at 715℃ for different time. (a) STEM image showing the position of EDS line scan near the grain boundary of the samples, and the distribution of chromium concentration at different types of grain boundaries in the samples aged at 715℃ for (b) 2 h, (c) 15 h, (d) 50 h

Fig.5 Evolution of chromium depletion zone near grain boundaries with various characters in the samples aged at 715℃ for different time (a) the half high width and (b) the depth of chromium depletion zone

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