Oxidation Behavior in Air-steam Mixed Atmosphere at 1000oC of Four Typical High-temperature Alloys for Gas Turbine

doi:10.11902/1005.4537.2023.105

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (2): 355-364 DOI: 10.11902/1005.4537.2023.105

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Oxidation Behavior in Air-steam Mixed Atmosphere at 1000^oC of Four Typical High-temperature Alloys for Gas Turbine

LIANG Zhiyuan¹(

), ZHANG Chao², QU Jinyu², HE Jianyuan², GUO Tingshan¹, XU Yiming¹

^1.School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
^2.National Engineering Research Center for Ship and Marine Special Equipment and Power Systems, No. 703 Research Institute of CSSC, Harbin 150078, China

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LIANG Zhiyuan, ZHANG Chao, QU Jinyu, HE Jianyuan, GUO Tingshan, XU Yiming. Oxidation Behavior in Air-steam Mixed Atmosphere at 1000^oC of Four Typical High-temperature Alloys for Gas Turbine. Journal of Chinese Society for Corrosion and protection, 2024, 44(2): 355-364.

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Abstract

The use of doped hydrogen or pure hydrogen as fuel poses a severe test to the key structural components of gas turbines, especially the resistance of materials to steam oxidation. The high-temperature steam oxidation behavior of 4 typical high temperature alloys, namely DD5, K447A, GH3230 and GH3536 for gas turbine in a mixed flow of air with 10% steam at 1000^oC was studied by means of mass change measurement and thermodynamic theoretical calculation. It follows that the GH3230 and K447A alloys showed an oxidation mass gain and followed a parabolic law, while the alloys DD5 and GH3536 showed oxidation mass loss on the contrary. The oxidation products formed on K447A and GH3230 alloy were mainly layered Cr₂O₃ and Al₂O₃ scales. The spallation of Al₂O₃ oxide scales occurred on the surface of DD5 alloy, while oxide volatilization was found on GH3536 alloy. In sum, the steam oxidation resistance of the four alloys may be ranked as following: K447 > GH3230 > DD5 > GH3536.

Key words: superalloys steam oxidation combustion condition gas turbine

Received: 11 April 2023 32134.14.1005.4537.2023.105

ZTFLH:

TG174

Fund: Innovative engineering(211-XXXX-N106-01-04);Independent Science and Technology Research and Development Special Project(202206Z);Major National Science and Technology Project(J2019-III-0012-0055)

Corresponding Authors: LIANG Zhiyuan, E-mail: liangzy@xjtu.edu.cn

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	LIANG Zhiyuan
	ZHANG Chao
	QU Jinyu
	HE Jianyuan
	GUO Tingshan
	XU Yiming

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.105 OR https://www.jcscp.org/EN/Y2024/V44/I2/355

Fig.1 Schematic diagram of high-temperature steam oxidation experimental system

Table 1 Chemical compositions of four experimental superalloys (mass fraction / %)

Fig.2 Mass changes of four superalloys during oxidation at 1000^oC in air + 10%H₂O

Fig.3 XRD patterns of DD5 (a), K447A (b), GH3230 (c) and GH3536 (d) superalloys after oxidation for 100, 200 and 300 h

Fig.4 Low (a-c) and high (d) magnification SEM images of DD5 supper alloy after oxidation for 100 h (a), 200 h (b) and 300 h (c, d)

Table 2 EDS results of the points marked in Fig.4 for DD5 supper alloy after 100, 200 and 300 h oxidation (mass fraction / %)

Fig.5 Low (a-c) and high (d) magnification SEM images of K447A supper alloy after oxidation for 100 h (a), 200 h (b) and 300 h (c, d)

Table 3 EDS results of the points marked in Fig.5 for K447A supperalloy after 100, 200 and 300 h oxidation (mass fraction / %)

Fig.6 Low (a-c) and high (d) magnification SEM images of GH3230 supper alloy after oxidation for 100 h (a), 200 h (b) and 300 h (c, d)

Table 4 EDS results of the points marked in Fig.6 for GH3230 supperalloy after 100, 200 and 300 h oxidation (mass fraction / %)

Fig.7 Low (a-c) and high (d) magnification SEM images of GH3536 alloy after oxidation for 100 h (a), 200 h (b) and 300 h(c, d)

Table 5 EDS results of the points marked in Fig.7 for GH3536 supperalloy after 100, 200 and 300 h oxidation (mass fraction / %)

Fig.8 Cross-sectional morphology (a) and EDS element distributions (b) of DD5 supperalloy oxidized for 300 h

Fig.9 Cross-sectional morphology (a) and EDS element distributions (b) of K447A supperalloy oxidized for 300 h

Fig.10 Cross-sectional morphologies (a, c) and EDS element distributions (b, d) of K447A superalloy oxidized for 100 h (a, b) and 300 h (c, d)

Fig.11 Cross-sectional morphology (a) and EDS element distributions (b) of GH3536 superalloy oxidized for 300 h

Table 6 Gibbs free energy changes of the reactions of main alloying elements with H₂O at 1000^oC

No.	Chemical reaction equation	$P O 2$ / MPa
1	2Ni+O₂ (g)=2NiO	4.54 × 10^-12
2	2Mn+O₂(g)=2MnO	2.49 × 10^-23
3	4/3Cr+O₂ (g)=2/3Cr₂O₃	1.36 × 10^-23
4	4/3Al+O₂ (g)=2/3Al₂O₃	1.73 × 10^-36

Table 7 Equilibrium oxygen partial pressures for the oxidation reactions of Ni, Mn, Cr and Al at 1000 °C

Fig.12 Thermodynamic phase diagrams of Ni-Cr-Mn-H-O (a) and Ni-Cr-Al-H-O (b) systems at 1000^oC

Fig.13 Schematic illustrations of oxidation mechanism of three supper alloys at 1000^oC in air + H₂O environment: (a) DD5 alloy, (b) K447A alloy, (c) GH3536 alloy

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