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.
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El-Hossary, F.M., Khalil, S.M., Lotfy, K. et al. The Influence of Hot-Rolled Temperature on Plasma Nitriding Behavior of Iron-Based Alloys. J Low Temp Phys 156, 38–47 (2009). https://doi.org/10.1007/s10909-009-9883-1
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DOI: https://doi.org/10.1007/s10909-009-9883-1