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Effect of liquid nitriding at 400–670 °C on microstructure and properties of C110 steel

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Abstract

Liquid nitriding of C110 steel was conducted in a wide range of temperatures (400–670 °C) using a kind of chemical heat-treatments, and the hardness, mechanical and corrosion properties of the nitrided surface were evaluated. Experimental results revealed that the microstructure and phase constituents of the nitrided surface alloy are highly depended on the processing condition. When C110 steel was subjected to liquid nitriding at 430 °C, the nitrided layer was almost composed of a thin ε-Fe2–3N layer. When C110 steel was subjected to liquid nitriding at 640 °C, the phase composition of the nitrided layer was greatly changed. The nitrided layer depth increased significantly with increasing the treating temperature. The liquid nitriding effectively improved the surface hardness. After liquid nitriding, the absorption energy of the treated sample decreased and the tensile strength increased by Charpy V-notch (CVN) test. But the elongation of treated sample decreased. The reason is that the nitrided layer of sample is hardened and there is brittlement by diffusion of nitrogen atom. Despite of treatment temperature, the liquid nitriding can improve the corrosion. After being nitrided at 430 °C, the nitrided layer of the C110 steel was mainly composed by ε-Fe2–3N, which has excellent corrosion resistance and high microhardness, the nitrided sample has the best corrosion resistance. After nitriding temperature over 580 °C, especially at 680 °C, the sample’s surface was covered by the thick oxide layer, which has very low hardness and corrosion resistance. So, the corrosion resistance of samples is severely compromised.

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Authors and Affiliations

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

    Jing Yan  (闫静), Jun Wang  (王均), Dong Pan  (潘东) & Hong-yuan Fan  (范洪远)

  2. Southwest Oil and Gasfield Company Research Institute of Natural Gas, Chengdu, 610231, China

    Jing Yan  (闫静) & Tan Gu  (谷坛)

  3. Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, OH, 44106, USA

    Dan-qi Wang  (王单奇)

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

    Yuan-hua Lin  (林元华)

Authors
  1. Jing Yan  (闫静)
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  2. Jun Wang  (王均)
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  3. Tan Gu  (谷坛)
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  4. Dong Pan  (潘东)
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  5. Dan-qi Wang  (王单奇)
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  6. Yuan-hua Lin  (林元华)
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  7. Hong-yuan Fan  (范洪远)
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Correspondence to Hong-yuan Fan  (范洪远).

Additional information

Foundation item: Projects(51471112, 51611130204) supported by the National Natural Science Foundation of China

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Yan, J., Wang, J., Gu, T. et al. Effect of liquid nitriding at 400–670 °C on microstructure and properties of C110 steel. J. Cent. South Univ. 24, 325–334 (2017). https://doi.org/10.1007/s11771-017-3434-8

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  • DOI: https://doi.org/10.1007/s11771-017-3434-8

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