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Effects of the Treating Time on Microstructure and Erosion Corrosion Behavior of Salt-Bath-Nitrided 17-4PH Stainless Steel

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Abstract

The effects of salt-bath nitriding time on the microstructure, microhardness, and erosion-corrosion behavior of nitrided 17-4PH stainless steel at 703 K (430 °C) were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and erosion-corrosion testing. The experimental results revealed that the microstructure and phase constituents of the nitrided surface alloy are highly process condition dependent. When 17-4PH stainless steel was subjected to complex salt-bathing nitriding, the main phase of the nitrided layer was expanded martensite (α`), expanded austenite (S), CrN, Fe4N, and Fe2N. The thickness of nitrided layers increased with the treating time. The salt-bath nitriding improves effectively the surface hardness. The maximum values measured from the treated surface are observed to be 1100 HV0.1 for 40 hours approximately, which is about 3.5 times as hard as the untreated material (309 HV0.1). Low-temperature nitriding can improve the erosion-corrosion resistance against two-phase flow. The sample nitrided for 4 hours has the best corrosion resistance.

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Acknowledgments

The authors are very grateful to the National Natural Science Foundation of China (Grant No. 50901047) for financial support of this research work. The author (J.W) would like to thank Prof. Luo Defu of Xihua University, China for valuable discussions during the course of the research.

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Authors and Affiliations

  1. School of Manufacturing Science and Engineering, Sichuan University, Chengdu, 610065, P.R. China

    Jun Wang (Associate Professor), Mingxing Li (Master Degree Candidate), Hongyuan Fan (Professor) & Ji Xiong (Professor)

  2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, 610500, P.R. China

    Yuanhua Lin (Professor) & Dezhi Zeng (Associate Professor)

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  1. Jun Wang
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  2. Yuanhua Lin
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  3. Mingxing Li
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  4. Hongyuan Fan
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  5. Dezhi Zeng
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  6. Ji Xiong
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Corresponding author

Correspondence to Jun Wang.

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Manuscript submitted December 18, 2012.

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Wang, J., Lin, Y., Li, M. et al. Effects of the Treating Time on Microstructure and Erosion Corrosion Behavior of Salt-Bath-Nitrided 17-4PH Stainless Steel. Metall Mater Trans B 44, 1010–1016 (2013). https://doi.org/10.1007/s11663-013-9841-9

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  • DOI: https://doi.org/10.1007/s11663-013-9841-9

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