Influence of Layer Thickness of RPV Steel Samples Prepared by WEDM Technology
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.
KeywordsWire-cut electrical discharge machining technology Influence layer Vickers hardness Reactor pressure vessel steels
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