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Improving Emergency Supply System to Ensure Port City Safety

100%

Wang Z. , Zhu Z. , Cheng W.

tom Vol. 5, no. 3

279--283

To efficiently implement emergency response program to port unexpected incidents, a perfect emergency supply system which including communications supplying, transportation supplying and rescue equipments supplying must be ready-to-used. Considering physical geography, harbor area, possible incident type and incident scale and other factors, using multi-objective fuzzy decision theory to set up emergency supply centers, improving sharing resource mechanism, administrative legislation and other measures are be used to improve port emergency supply system. Shanghai port’s practice prove the improve port emergency supply system is effective.

Development of WC-Inconel composites using selective laser melting

75%

Nguyen Q. B. , Zhu Z. , Chua B. W. , Zhou W. , Wei J. , Nai S. M. L.

tom Vol. 18, no. 4

1410--1420

In the present study, selective laser melting (SLM) was used to successfully fabricate Inconel 718–tungsten carbide (WC) composites. The processing parameter optimization results reveal that nearly non-porous composites (99.54%) were achieved with the laser power of 220 W, scanning speed of 850 mm s−1, and the hatch spacing of 150 μm. The microstructural characterization unveils that elongated grain structure in the heat flow direction was observed in the case of pure IN718 while WC particles served as obstacles to hinder the grain growth in the composites. The formation of in situ intermediate layer and the strong interfacial bonding between WC super-hard particles and the matrix acted as load bearing and significantly contribute to the overall properties of composites. Mechanical tests indicate significant improvements of microhardness and tensile strengths, although a drop in strength was observed when the amount of WC reached 15 wt.%. In addition, the thermal experiment shows that the composites are dimensionally stable at higher temperature compared to their monolithic counterpart. The findings suggest that the developed IN718-WC composites can be utilized in many critical engineering applications in nuclear sector.