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摘要
In this study, the effect of a nitrogen compression plasma flow on the microstructural, mechanical, and tribological properties, as well,as the elemental and phase compositions of a Zr/austenitic steel system, has been investigated. The Zr/steel system was exposed to a single pulse of the compression plasma flow or to a series of pulses of different energies. The plasma pulse duration and discharge current were 100 mu s and 80 kA, respectively. The samples were characterized by scanning electron microscopy, X-ray diffraction, energy dispersive X-ray analyses, and subjected to Vickers microhardness and friction tests. The findings showed the formation of a surface modified layer alloyed by Zr depending on the absorbed energy value was about 12-20 mu m. An increase in both the number of pulses,and absorbed energy density provides a more uniform zirconium distribution in the modified layer. The surface microhardness and wear resistance of the treated samples increased by factors of 1.6 and 5.4, respectively. The modified layer contains alpha- and gamma-iron-based solid solutions, the Fe23Zr6 intermetallic compound, and ZrN and Cr2N nitrides due to nitrogen diffusion.
- 出版日期2012
