The metal components exposed to the high-velocity liquid-solid flow can be rapidly eroded by the accelerated particles.With an excellent combination of strength and toughness,the NiCoCrFeNb0.45 eutectic high-entropy alloy(EHEA)has emerged as a promising material to resist erosion damage.In this study,the erosion behavior of NiCoCrFeNb0.45 EHEA in high-velocity multiphase flow is investigated through the coupling analysis of material properties,multiphase flow,and particle-surface impact behavior.The inherent mathematical relationship is discovered between the erosion rates and the impact velocity,impact angle,and test time.The results show that the NiCoCrFeNb0.45 EHEA has superior erosion resist-ance than the commonly used machinery materials.The principal material removal mechanism is the formation and brittle fracture of the platelets,accompanied by micro-cutting and ploughing at some oblique angles.The higher work-hardenability of NiCoCrFeNb0.45 EHEA could mitigate the erosion damage as time proceeds,and this effect becomes more apparent as the impact angle increases.Therefore,the evolution of erosion damage with time varies significantly depending on the impact angle.Based on the test data and computational fluid dynamics(CFD)modeling of the near-wall flow field,a power exponential function relationship between erosion depth and the corresponding impact velocity at various locations on the material surface is established.

Kai Wang;Zhenjiang Wang;Jinling Lu;Zhijun Wang;Wei Wang;Xingqi Luo

State Key Laboratory of Eco-Hydraulics in Northwest Arid Region,Xi'an University of Technology,Xi'an 710048,China;State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China

金属学报（英文版）

[1]Kai Wang;Zhenjiang Wang;Jinling Lu;Zhijun Wang;Wei Wang;Xingqi Luo-.Erosion Behavior of NiCoCrFeNb0.45 Eutectic High-Entropy Alloy in Liquid-Solid Two-Phase Flow)[J].金属学报（英文版）,2022(08):1266-1274

NiCoCrFeNb0

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