The Unidirectional Tensile Characteristics of Ion-Nitrided and Ion-Carbonitrided Surface Layer of 40CrNiMo

  • Guan Delin
  • Yu Zhiwei
  • Zhang Hongtien
  • Yang Lieyu

Abstract

The mechanical behavior of ion-nitrided and ion-carbonitrided surface layers of 400rNiMo has been studied by acoustic emission and SEM. It shows that the unidirectional tensile yield strength of materials can be raised by the above-montioned surface treatment. The plastic deformation of the surface layer occurs before the low yield point or after according to the difference of residual stress distribution. The formation of surface deformation streaks and their influence on the surface layer splitting are discussed.

Keywords

Residual Stress Acoustic Emission Compressive Residual Stress Compound Layer Tensile Residual Stress 
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References

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    Xu Xiaolei, Hei Zukun and Yang Lieyu, The study on the structures of ion-carbonitriding surface layer of 40CrNiMo, Annual Progress Report, Dalian Maritime University, Dalian, October 1989.Google Scholar
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    Zhu Zuming, Mu Zaiqin, Wang Shuangquan and Yin Huazi, Acoustic emission during plastic deformation and micro-crecking process of -Ti. Acta Metallurgica Sinica, 1982, vol. 18, No. 3, pp. 272.Google Scholar
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Copyright information

© Springer Science+Business Media Dordrecht 1990

Authors and Affiliations

  • Guan Delin
    • 1
  • Yu Zhiwei
    • 1
  • Zhang Hongtien
    • 2
  • Yang Lieyu
    • 1
  1. 1.Institute of Materials and TechnologyDalianPeople’s Republic of China
  2. 2.Institute of Metal ResearchShenyangPeople’s Republic of China

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