Oxidation Behavior of GH984G Alloy in Steam at 700 ℃

doi:10.11900/0412.1961.2018.00440

Acta Metall Sin

2019, Vol. 55

Issue (7): 893-901 DOI: 10.11900/0412.1961.2018.00440

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Oxidation Behavior of GH984G Alloy in Steam at 700 ℃

Changshuai WANG¹(

),Lili GUO¹,Liying TANG²,Rongcan ZHOU²,Jianting GUO¹,Lanzhang ZHOU¹

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. Xi’an Thermal Power Research Institute Co. , Ltd. , Xi’an 710032, China

Cite this article:

Changshuai WANG,Lili GUO,Liying TANG,Rongcan ZHOU,Jianting GUO,Lanzhang ZHOU. Oxidation Behavior of GH984G Alloy in Steam at 700 ℃. Acta Metall Sin, 2019, 55(7): 893-901.

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Abstract

To produce abundant and cheap electricity in a cleaner way, the next generation of advanced ultra-supercritical (A-USC) coal-fired power plants with higher thermal efficiency will operate at service temperatures at 700 ℃ and steam pressures up to 35 MPa. However, the temperature capacity of the currently used ferritic or austenitic steels in USC plants at 600 ℃ cannot meet the requirements. GH984G is a newly developed Ni-Fe-Cr base alloy designed for A-USC, but its oxidation behavior in steam at 700 ℃ is unclear. In this work, the oxidation kinetics of GH984G alloy in steam at 700 ℃ was investigated by weighting specimens at intervals. Morphology, composition and phase constituent of the steam oxide scale were characterized using SEM, EDS and XRD. The results show that the oxidation of GH984G alloy follows a parabolic law with a rate constant of 0.00521 mg/(cm²·h^1/2) and steady weight gain rate of 8×10^-4 g/(m²·h). The oxide scale mainly consists of Cr₂O₃ and Al₂O₃. Meanwhile, a small amount of TiO₂ was observed. The oxide scale of Cr₂O₃ forms on the alloy surface and then the internal oxidation of Al to be Al₂O₃ occurs along the grain boundaries of the matrix alloy and TiO₂ forms at the surface of the external oxide scale. The morphology of Cr₂O₃ at the surface of the oxide scale is needle-like at the initial oxidation stage and then the agglomeration of Cr₂O₃ was observed and the cellular shape forms. Finally, the coalescence of the cellular Cr₂O₃ appears and the flat surface of the external oxide scale forms. The excellent oxidation resistant of GH984G alloy in steam at 700 ℃ can be attributed to the compact external oxide scale of Cr₂O₃ and the root-like internal oxide scale of Al₂O₃.

Key words: GH984G alloy Ni-Fe-Cr base alloy steam oxidation 700 ℃ ultra-supercritical coal-fired power plant

Received: 14 September 2018

ZTFLH:

TG111.8

Fund: National Key Research and Development Program of China(No.2017YFB0305204);National High Technology Research and Development Program of China(No.2012AA03A501);National Natural Science Foundation of China(No.51301171);National Energy Administration Program of China(No.NY20150102);Science and Technology Program of Sichuan Province(No.2016JZ0036)

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	Changshuai WANG
	Lili GUO
	Liying TANG
	Rongcan ZHOU
	Jianting GUO
	Lanzhang ZHOU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00440 OR https://www.ams.org.cn/EN/Y2019/V55/I7/893

Fig.1 Oxidation kinetics curves of GH984G alloy in steam at 700 ℃ (Δw—mass gain, t—oxidation time)(a, b) Δw versus t (c) relationship between Δw and t^1/2

Fig.2 XRD spectra of GH984G alloy oxidized at 700 ℃ for different time in steam

Fig.3 Low (a, c, e, g, i) and high (b, d, f, h, j) magnified surface SEM images of scales formed on GH984G alloy oxidized at 700 ℃ for 100 h (a, b), 300 h (c, d), 500 h (e, f), 1000 h (g, h) and 2000 h (i, j)

Table 1 EDS analyses of chemical compositions of the surface oxidation of GH984G alloy after oxidation at 700 ℃ for different time

Fig.4 Cross-section SEM images of GH984G alloy oxidized at 700 ℃ for 100 h (a), 1000 h (b) and 2000 h (c)

Fig.5 Cross-section SEM image and element distributions of GH984G alloy oxidized in steam at 700 ℃ for 2000 h

Fig.6 Cross-section image and line scans of GH984G alloy after oxidiation in steam at 700 ℃ for 2000 h

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