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Journal of Chinese Society for Corrosion and protection  2024, Vol. 44 Issue (6): 1625-1632    DOI: 10.11902/1005.4537.2024.027
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Hot Corrosion Behavior of a Nickel Based Single Crystal High Temperature Alloy Subjected to Different Heat Treatments
ZHANG Jinlong1, FU Guangyan1(), NING Likui2, LIU Enze2, TAN Zheng2, TONG Jian2, ZHENG Zhi2
1. School of Mechanical and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Cite this article: 

ZHANG Jinlong, FU Guangyan, NING Likui, LIU Enze, TAN Zheng, TONG Jian, ZHENG Zhi. Hot Corrosion Behavior of a Nickel Based Single Crystal High Temperature Alloy Subjected to Different Heat Treatments. Journal of Chinese Society for Corrosion and protection, 2024, 44(6): 1625-1632.

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Abstract  

A nickel based single crystal high-temperature alloy was subjected to two different heat- treatments, namely complete heat treatment (CH) and long-term aging after complete heat treatment (CH-LA).Then their hot corrosion behavior beneath a 75%Na2SO4 + 25%NaCl mixed salt film in air at 900℃ was studied by means of metallographic microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD) methods, in terms of the surface morphology, phase composition, and element distribution of the alloy after 100 h corrosion. The results indicate that fine γ-particles with good cubic degree are uniformly distributed on the matrix γ' phase for the CH alloy. While the γ'-phase was deformed coarsened, and rafted, meanwhile spherical, needle like, and short rod like TCP phases did precipitated for the CH-LA alloy. The corrosion kinetics curves of the two different heat-treated alloys are similar to parabolas or segmented parabolas. The corrosion rate of CH alloy is relatively small, while a continuous Al2O3 outer oxide scale is formed on the surface, and Al internal oxidation and Cr, Ni internal sulfidation occur in the inner layer, and slight spallation of the corrosion product scale was observed. The CH-LA alloy shows a relatively high corrosion rate with significant spallation of the formed surface corrosion products, which is a thick composite oxide scale with an extremely thin Al2O3 scale on the surface, beneath that, there is a zone of internal oxidation of Al and internal sulfidation of Cr and Ni.
Key words:  nickel based single crystal alloy      long term timeliness      hot corrosion      TCP phase     
Received:  17 January 2024      32134.14.1005.4537.2024.027
ZTFLH:  TG178  
Fund: National Key R&D Program of China(2022YFB3705004)
Corresponding Authors:  FU Guangyan, E-mail: Fu_guangyan@126.com
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ZHANG Jinlong
FU Guangyan
NING Likui
LIU Enze
TAN Zheng
TONG Jian
ZHENG Zhi

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.027     OR     https://www.jcscp.org/EN/Y2024/V44/I6/1625

Heat treatment

CH Sample

(completely heat treated)

CH-LA Sample

(complete heat treatment + long-term aging)

Solution1270oC/1 h + 1280oC/1 h + 1290oC/2 h + 1300oC/3 h + 1310oC/30 h, AC

1270oC/1 h + 1280oC/1 h + 1290oC/2 h +

1300oC/3 h + 1310oC/30 h, AC

Primary aging1100oC/4 h, AC1100oC/4 h, AC
Secondary aging870oC/32 h, AC870oC/32 h, AC
Long-term aging-1000oC/600 h, AC
Table 1  Heat treatment schemes of the alloy
Fig.1  Microscopic structures of CH sample (a) and CH-LA sample (b)
Fig.2  Mass gain curves of CH and CH-LA alloy samples during hot corrosion in 75%Na2SO4 + 25%NaCl molten salt at 900oC for 100 h
Fig.3  Corrosion depth curves of CH and CH-LA alloy samples after hot corrosion in 75%Na2SO4 + 25%NaCl molten salt at 900℃ for 100 h
Fig.4  XRD patterns of CH and CH-LA alloy samples
Fig.5  XRD patterns of the surfaces of CH and CH-LA alloy samples after hot corrosion in 75%Na2SO4 + 25%NaCl molten salt at 900oC for 100 h
Fig.6  Macro morphologies of CH (a-e) and CH-LA (f-j) alloy samples after hot corrosion in mixed molten salt at 900oC for 20 h (a, f), 40 h (b, g), 60 h (c, h), 80 h (d, i) and 100 h (e, j)
Fig.7  SEM morphology of CH sample after hot corrosion at 900oC for 100 h (a), and corresponding EDS mappings of Al (b), O (c), Cr (d), Ni (e), Co (f), Re (g) and S (h)
Fig.8  Cross-sectional morphologies of CH (a) and CH-LA (b) alloy samples after hot corrosion at 900oC for 100 h
Fig.9  SEM cross section of CH-LA sample after hot corrosion at 900oC for 100 h (a), and corresponding EDS mappings of Al (b), O (c), Cr (d), Ni (e), Co (f), Re (g) and S (h)
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