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Journal of Low Temperature Physics

, Volume 156, Issue 1–2, pp 38–47 | Cite as

The Influence of Hot-Rolled Temperature on Plasma Nitriding Behavior of Iron-Based Alloys

  • F. M. El-Hossary
  • S. M. Khalil
  • Kh. Lotfy
  • M. A. Kassem
Article

Abstract

Experiments were performed with an aim of studying the effect of hot-rolled temperature (600 and 900°C) on radio frequency (rf) plasma nitriding of Fe93Ni4Zr3 alloy. Nitriding was carried out for 10 min in a nitrogen atmosphere at a base pressure of 10−2 mbarr. Different continuous plasma processing powers of 300–550 W in steps 50 W or less were applied. Nitrided hot-rolled specimens were characterized by optical microscopy (OM), X-ray diffraction (XRD) and microhardness measurements. The results reveal that the surface of hot-rolled rf plasma nitrided specimens at 600°C is characterized with a fine microstructure as a result of the high nitrogen solubility and diffusivity. Moreover, the hot-rolled treated samples at 600°C exhibit higher microhardness value than the associated values of hot-rolled treated samples at 900°C. The enhancement of microhardness is due to precipitation and predominance of new phases (γ and ε phases). Mainly, this conclusion has been attributed to the high defect densities and small grain sizes of the samples hot-rolled at 600°C. Generally, the refinement of grain size plays a dramatic role in improvement of mechanical properties of tested samples.

Keywords

Hot-rolled RF plasma Fe93Ni4Zr3 Microhardness X-ray diffraction 

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • F. M. El-Hossary
    • 1
  • S. M. Khalil
    • 1
    • 2
  • Kh. Lotfy
    • 1
  • M. A. Kassem
    • 3
  1. 1.Physics Department, Faculty of ScienceSohag UniversitySohagEgypt
  2. 2.Physics DepartmentUniversity of Colorado at BoulderBoulderUSA
  3. 3.Department of Materials & Met. Eng., Faculty of Petroleum & Mining Eng.Suez Canal UniversitySuezEgypt

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