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Hot corrosion behavior and mechanical properties degradation of a Ni–Cr–W-based superalloy

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Abstract

The effect of molten salts on the mechanical properties of a Ni–20Cr–18W (wt%)-based superalloy was investigated in this work. The hot corrosion characteristics and the microstructural evolution during the hot corrosion process were analyzed. The corrosion scale forms on the surface of the substrate, and its thickness increases gradually during the process. The element of S invades the substrate. The corrosion products mainly include NiO, Ni3S2 and Cr2O3. The hot corrosion in molten salt makes the specimens rough and flawed. The serration grain boundaries are observed in the hot corroded specimens. The tensile strength and elongation of the original alloy are ~1023 MPa and ~15 %, respectively. After corroded for 5 h, the tensile strength and elongation of the specimen decrease to ~771 MPa and ~7 % and diminish to ~814 MPa and ~9 % for the specimen corroded for 10 h. The hot corrosion process deteriorates the mechanical properties of the alloys. And the tensile strength and elongation of the specimen corroded for 20 h sharply decrease to ~539 MPa and ~3 %, respectively. The nonmonotonic variation of the mechanical properties of the specimen occurs for the specimens corroded for 10 h, which is related to the competition between the depredation of the molten salts and the strengthening process by carbides and the serrated grain boundaries.

Graphical Abstract

The corrosion characteristics and microstructural evolution of a Ni–20Cr–18W-based superalloy were investigated during the hot corrosion process. It is found that the attack of molten salts makes the tensile strength of the specimens deteriorate significantly. The nonmonotonic variation of mechanical properties is related to the competition between the destruction of molten salts and the strengthening process during the hot corrosion process.

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Acknowledgments

This study was financially supported by the National Natural Science Foundation of China (No. 51171150) and the Program of the Ministry of Education of China for Introducing Talents of Discipline to Universities (No. B08040).

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, **’an, 710072, China

    Rui-Feng Dong, Tie-Bang Zhang, Rui Hu, Hong-Chao Kou & **-Shan Li

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  1. Rui-Feng Dong
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  2. Tie-Bang Zhang
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  4. Hong-Chao Kou
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  5. **-Shan Li
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Correspondence to Tie-Bang Zhang.

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Dong, RF., Zhang, TB., Hu, R. et al. Hot corrosion behavior and mechanical properties degradation of a Ni–Cr–W-based superalloy. Rare Met. 36, 23–31 (2017). https://doi.org/10.1007/s12598-016-0751-2

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  • DOI: https://doi.org/10.1007/s12598-016-0751-2

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