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Effect of Temperature on Microstructure, Corrosion Resistance, and Toughness of Salt Bath Nitrided Tool Steel

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Abstract

In this study, a type of hot work tool steel was modified through salt bath nitriding for 4 h at 540 and 560 °C, and post-oxidation was subsequently performed. Surface and cross-sectional hardness test results revealed that the surface hardness increased after the treatment because of the formation of compound layers and diffusion zones. Microstructures and phase analyses showed that more homogeneous compound layers and Fe3O4-phase could be generated after treatment at 560 than at 540 °C. As a result, the corrosion potential was elevated, and the corrosion current density was clearly reduced. The thickness and porosity of the compound layer were also increased with the elevated nitriding temperature. Because of the nitrogen atom solution, XRD diffraction peaks broadened, and the position of the peaks shifted to a lower angle in different degrees at different depths, thus showing the same tendency as the hardness curves. Salt bath nitriding significantly deteriorated the impact toughness from 32.3 to 5.2 J.

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Acknowledgment

The authors gratefully acknowledge the Chengdu Surface Metal Technology Co. Ltd. for their support of this research project.

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Authors and Affiliations

  1. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China

    Hangtao Fu, Jin Zhang & Yong Lian

  2. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, China

    Jinfeng Huang & Cheng Zhang

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  1. Hangtao Fu
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  2. Jin Zhang
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  3. Jinfeng Huang
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  4. Yong Lian
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  5. Cheng Zhang
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Correspondence to Jin Zhang.

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Fu, H., Zhang, J., Huang, J. et al. Effect of Temperature on Microstructure, Corrosion Resistance, and Toughness of Salt Bath Nitrided Tool Steel. J. of Materi Eng and Perform 25, 3–8 (2016). https://doi.org/10.1007/s11665-015-1762-0

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  • DOI: https://doi.org/10.1007/s11665-015-1762-0

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