Gray cast iron is widely used for the cylinder bore of marine diesel engine. With the aim to improve the properties of the cylinder liner and maintain the matching ability with piston ring under the harsh working condition, the Fe-based alloy coating is fabricated on the gray cast iron using induction cladding. Owing to the high carbon content in both coating and substrate materials, it is extremely difficult to control the coating process and the coating quality. The additive of welding flux and prolonged heating time is proposed to prepare good quality coating. The coating forming mechanism is investigated, and the electrochemical corrosion and tribological properties of the coating are examined. The results show that the Fe-based coating possess better corrosive and tribological performance than gray cast iron, and it is seemed to be a potential candidate for improving the performance of the cylinder liner.
The adhesion strength tests of freshwater ice frozen to concrete material were performed in a reservoir by the precise control-temperature unit of ice at five temperatures (-2 °C, -4 °C, -6 °C, -8 °C, -10 °C) and the displacement rate in a range of 10-4-100 mm/s. The fitting curve of the peak adhesion strength and ice temperature was presented. The test results show that the frozen adhesion strength is very sensitive to the displacement rate. The frozen adhesion strength reaches the peak value at the ductile-brittle transition region, and the region is close to the lower strain-rate with decreasing temperature. The transition region of displacement rate is 3.0×10-4-7.5×10-3 mm/s. The results provide some design parameters for reservoirs in cold regions.
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