Influence of Layer Thickness of RPV Steel Samples Prepared by WEDM Technology
Abstract
Wire-cut electrical discharge machining (WEDM) technology has gradually become popular for preparing nuclear reactor pressure vessel (RPV) steel samples after neutron irradiation. The sample section in its polished state was characterized and analysed using metallographic microstructure observation, element energy spectrum analysis and the micro-region Vickers hardness (Hv) method. The experimental results show that the influence of the layer thickness of an RPV steel sample prepared by WEDM can be effectively distinguished by means of section micro-region Hv data, and the distance is approximately 120 μm to the sample surface, with a significant change in the range of 60 μm. This conclusion is also applicable to the preparation of other low-alloy steel samples with similar chemical composition, strength and toughness properties as well as heat treatment.
Keywords
Wire-cut electrical discharge machining technology Influence layer Vickers hardness Reactor pressure vessel steelsReferences
- 1.G.P. Wang, W.Q. Liu, Y.L. Huang et al., Effects of sintering temperature on the mechanical properties of sintered NdFeB permanent magnets prepared by spark plasma sintering. J. Magn. Magn. Mater. 349, 1–4 (2014)Google Scholar
- 2.K. Mouralova, J. Kovar, J. Mach, L. Klakurkova, J. Bednar, Analyzing the surface layer after WEDM depending on the parameters of a machine for the 16MnCr5 steel. J. Int. Meas. Confederation 94, 771–779 (2016)Google Scholar
- 3.J. Zhang, Q. Li, H. Zhang, Investigation of micro square structure fabrication by applying textured cutting tool in WEDM. Micromachines 6, 1427–1434 (2015)Google Scholar
- 4.P. Shandilya, P.K. Jain, N.K. Jain, Study on wire electric discharge machining based on response surface methodology and genetic algorithm. Adv. Mater. Res. 622, 1280–1284 (2013)Google Scholar
- 5.E. Levashov, A. Kudryashov, E. Kharlamov et al., Formation of FGM coating by the new method of thermoreactive electrospark surface strengthening. Mater. Sci. Forum 308–311, 262–270 (1999)Google Scholar