Abstract
High-entropy alloys (HEAs) have gained extensive attention due to their excellent properties and the related scientific value in the last decade. In this work, AlxCoCrFeNiTi0.5 HEA coatings (x: molar ratio, x = 1.0, 1.5, 2.0, and 2.5) were fabricated on Q345 steel substrate by laser-cladding process to develop a practical protection technology for fluid machines. The effect of Al content on their phase evolution, microstructure, and slurry erosion performance of the HEA coatings was studied. The AlxCoCrFeNiTi0.5 HEA coatings are composed of simple face-centered cubic (FCC), body-centered cubic (BCC) and their mixture phase. Slurry erosion tests were conducted on the HEA coatings with a constant velocity of 10.08 m/s and 16–40 meshs and particles at impingement angles of 15, 30, 45, 60 and 90 degrees. The effect of three parameters, namely impingement angle, sand concentration and erosion time, on the slurry erosion behavior of AlxCoCrFeNiTi0.5 HEA coatings was investigated. Experimental results show AlCoCrFeNiTi0.5 HEA coating follows a ductile erosion mode and a mixed mode (neither ductile nor brittle) for Al1.5CoCrFeNiTi0.5 HEA coating, while Al2.0CoCrFeNiTi0.5 and Al2.5CoCrFeNiTi0.5 HEA coatings mainly exhibit brittle erosion mode. AlCoCrFeNiTi0.5 HEA coating has good erosion resistance at all investigated impingement angles due to its high hardness, good plasticity, and low stacking fault energy (SFE).
Highlights
Slurry erosion (SE) is a serious concern for hydraulic turbines and other fluid machines due to silt entrained in water flow, especially in the Yellow River regions of China
The Al1.0 high-entropy alloys (HEAs) coating and Cr16 alloy showed the showed the maximum erosion rate at 45°, the erosion rate decreasing gradually with the maximum erosion rate at 45◦, the erosion rate decreasing gradually with the impingement angle, impingement angle, which is consistent with the theory of the ductile mode of erosion behavior which is consistent with the theory of the ductile mode of erosion behavior [19,20]
The effect of impingement angle, sand concentration and erosion time on the erosion behavior and mechanism of AlxCoCrFeNiTi0.5 HEA coatings were investigated by slurry erosion behavior and mechanism of Alx CoCrFeNiTi0.5 HEA coatings were investigated by slurry erosion test
Summary
Slurry erosion (SE) is a serious concern for hydraulic turbines and other fluid machines due to silt entrained in water flow, especially in the Yellow River regions of China. Hydraulic turbine equipment generally made of mild steel, white cast iron or stainless steel. These materials are considerably less resistant to erosive wear. High-entropy alloys (HEAs) have attracted extensive attention due to their versatile combinations including high strength and hardness, good thermal stability, excellent corrosion and wear resistance [3,4,5,6]. These characteristics make them suitable candidates for structural and functional materials. As the formation of simple solid solution phase requires high cooling rate, the shape and size of bulk ingots prepared by arc-melting technique are limited
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