RESEARCH ON THE CARBIDE PRECIPITATION AND CHROMIUM DEPLETION IN THE GRAIN BOUNDARY OF ALLOY 690 CONTAINING DIFFERENT CONTENTS OF NITROGEN

doi:10.11900/0412.1961.2015.00636

Acta Metall Sin

2016, Vol. 52

Issue (8): 980-986 DOI: 10.11900/0412.1961.2015.00636

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RESEARCH ON THE CARBIDE PRECIPITATION AND CHROMIUM DEPLETION IN THE GRAIN BOUNDARY OF ALLOY 690 CONTAINING DIFFERENT CONTENTS OF NITROGEN

Yingche MA(

),Shuo LI,Xianchao HAO,Xiangdong ZHA,Ming GAO,Kui LIU

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

Cite this article:

Yingche MA,Shuo LI,Xianchao HAO,Xiangdong ZHA,Ming GAO,Kui LIU. RESEARCH ON THE CARBIDE PRECIPITATION AND CHROMIUM DEPLETION IN THE GRAIN BOUNDARY OF ALLOY 690 CONTAINING DIFFERENT CONTENTS OF NITROGEN. Acta Metall Sin, 2016, 52(8): 980-986.

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Abstract

Nickel-based alloy Inconel 690 (hereinafter called alloy 690) is currently replacing alloy 600 as steam generator tubes in pressurized water nuclear reactors, owing to its excellent resistance to intergranular stress corrosion cracking (IGSCC) and good mechanical properties. The carbide precipitation is a major microstructural characteristic during heat treatment of stainless steels and nickel-based alloys. The carbide precipitation and chromium depletion in the grain boundary of alloy 690 were investigated. The grain size and carbide of alloy 690 with 0.001% and 0.03% (mass fraction) nitrogen contents were observed and analyzed. The extent of chromium depletion in the vicinity of grain boundaries was quantitatively determined as a function of thermal treatment time. The solution treatment of the samples was at 1080 ℃ for 10 min, and then the samples were thermally treated at 715 ℃ for 1~25 h. The results show that the nitrogen addition decreases the intergranular carbide density and the average carbide length but increases its distance. The level of chromium in the depleted regions in alloy 690 with 0.03%N is higher than that with 0.001%N. This is attributed to the beneficial role of nitrogen addition against grain growth and sensitization.

Key words: alloy 690 N carbide precipitation chromium depletion

Received: 09 December 2015

Fund: Supported by Chinese Academy of Scicences Innovation Foundation (No;CXJJ-14-M44)

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	Yingche MA
	Shuo LI
	Xianchao HAO
	Xiangdong ZHA
	Ming GAO
	Kui LIU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00636 OR https://www.ams.org.cn/EN/Y2016/V52/I8/980

Table 1 Chemical compositions of the alloy 690(mass fraction / %)

Fig.1 SEM images of carbides in hot-rolled 10N (a) and 300N (b) alloys where intergranular carbides are indicated with arrows

Fig.2 OM images of 10N (a) and 300N (b) alloys solution treated at 1080 ℃ for 10 min (SA)

Fig.3 TEM image of carbides in the 10N alloy after SA and thermally treated at 715 ℃ (TT) for 1 h (a), electron diffraction pattern (b) and corresponding index result (c) of γ matrix and M₂₃C₆

Fig.4 TEM images of carbides (M₂₃C₆) precipitated at grain boundaries of 10N alloy after SA and TT for 1 h (a), 5 h (b), 15 h (c) and 25 h (d)

Table 2 Quantitative analysis of precipitate characteristics

Fig.5 TEM images of carbides (M₂₃C₆) precipitated at grain boundaries of 300N alloy after SA and TT for 1 h (a), 5 h (b), 15 h (c) and 25 h (d)

Fig.6 Cr concentration curves of 10N and 300N alloys after SA and TT for 1 h (a), 5 h (b), 15 h (c) and 25 h (d)

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