Strength of Materials

, Volume 50, Issue 1, pp 211–217 | Cite as

Analysis of Gas Nitriding Characteristics Under Different Cold Hardening and Nitriding Pressure Conditions for Low-Carbon Low-Alloy Steel

  • Z. A. Zhou
  • W. T. Fu
  • R. H. Zhang
  • J. J. Qi
  • G. F. Jin
  • Z. H. Wang
  • S. H. Sun
Article
  • 8 Downloads

A new approach to quick preparation of a nitrided case for low-carbon low-alloy steels was proposed. It is based on cold hardening and pressurized gas nitriding. The microstructure, surface hardness, thickness, and corrosion resistance of the nitrided layer on low-carbon low-alloy steel (20CrMnTi) were investigated after the nitriding at 510°C for 5 h under different cold rolling reduction (0–60% CR) and nitriding pressure (1–5 atm). The results show that this technique can significantly improve the nitriding steel efficiency with the nitrided layer mainly composed of Fe2-3N and Fe4N nitrides. At constant nitriding pressure, the nitrided layer hardness first increases and then decreases with the amount of cold hardening. At the constant hardening, the nitrided layer hardness and corrosion resistance increase with the nitriding pressure. For the sample nitrided at 510°C for 5 h under 30% CR and a pressure of 5 atm, the nitrided layer exhibits optimal properties: hardness of 825 HV and thickness of 310 μm.

Keywords

low-carbon low-alloy steel nitride nitriding pressure cold hardening nitriding efficiency 

Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant No. 51505416), the Foundation for Young Scholars in Yanshan University (Grant No. 14LGA004) and the Post-Doctoral Research Project of Hebei Province of China (Grant No. B2016003029).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Z. A. Zhou
    • 1
  • W. T. Fu
    • 1
  • R. H. Zhang
    • 2
  • J. J. Qi
    • 1
  • G. F. Jin
    • 1
  • Z. H. Wang
    • 3
  • S. H. Sun
    • 1
  1. 1.State Key Laboratory of Metastable Materials Science and Technology, College of Materials Science and EngineeringYanshan UniversityQinhuangdaoChina
  2. 2.Hebei Province Key Laboratory of Modern Metallurgy, College of Metallurgy and EnergyNorth China University of Science and TechnologyTangshanChina
  3. 3.College of Mechanical EngineeringYanshan UniversityQinhuangdaoChina

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