Superior Slurry Erosion Behavior of a Casting NiCoCrFeNb0.45 Eutectic High Entropy Alloy

doi:10.1007/s40195-020-01070-8

金属学报英文版 ›› 2020, Vol. 33 ›› Issue (8): 1111-1116.DOI: 10.1007/s40195-020-01070-8

收稿日期:2020-02-01 修回日期:2020-03-11 出版日期:2020-08-10 发布日期:2020-08-06

Superior Slurry Erosion Behavior of a Casting NiCoCrFeNb_0.45 Eutectic High Entropy Alloy

Jinling Lu¹, Zhenjiang Wang¹, Wei Wang¹(), Kexuan Zhou², Feng He², Zhijun Wang²()

¹Faculty of Water Resources and Hydroelectric Engineering, Xi’an University of Technology, Xi’an, 710048, China
²State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, China

Received:2020-02-01 Revised:2020-03-11 Online:2020-08-10 Published:2020-08-06
Contact: Wei Wang,Zhijun Wang

摘要/Abstract

Abstract:

The flow passage components in hydraulic machinery will be eroded rapidly when running in sand water. The wear resistance of materials commonly used in hydraulic machinery needs to be improved to prevent the failure of hydraulic machinery. New wear-resistant materials are urgently needed to improve the service life of hydraulic machinery. Eutectic high entropy alloy (EHEA) is a new kind of alloys with in situ lamellar structure. NiCoCrFeNb_0.45 EHEA has combined excellent strength and toughness. In this study, slurry erosion tests of NiCoCrFeNb_0.45 EHEA were carried out with different impact angles and impact velocities using a rotary jet erosion test apparatus. The NiCoCrFeNb_0.45 EHEA exhibited significant slurry erosion resistance compared with medium carbon steel 1045 and stainless steel 04Cr13Ni5Mo. The erosion rate of EHEA is much slower. Compared with medium carbon steel and stainless steel, the erosion of EHEA is completed via the accumulation and removal of platelets after plowing and work hardening, accompanied by partial micro-cutting.

Key words: Eutectic high entropy alloy, Friction and wear, Slurry erosion

. [J]. 金属学报英文版, 2020, 33(8): 1111-1116.

Jinling Lu, Zhenjiang Wang, Wei Wang, Kexuan Zhou, Feng He, Zhijun Wang. Superior Slurry Erosion Behavior of a Casting NiCoCrFeNb_0.45 Eutectic High Entropy Alloy[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(8): 1111-1116.

图/表 7

Fig. 1 Schematic view of the slurry erosion test apparatus used in the experiment

Table 1 Test parameters used for slurry erosion

Parameters (Unit)	Value
Temperature (°C)	25
Impact velocity (m/s)	20, 25
Erosion time (h)	12
Nozzle diameter (mm)	2.5
Impact angle (°)	20, 30
Particle (μm)	100-200
Stand-off distance (mm)	12

Fig. 2 Microstructures of a MCS 1045, b SS 04Cr13Ni5Mo c NiCoCrFeNb0.45 EHEA

Table 2 Hardness of EHEA NiCoCrFeNb0.45, SS 04Cr13Ni5Mo and MCS 1045

Material	Hardness (Hv)
EHEA	522
SS	201
MCS	181

Fig. 3 Variation in the erosion of MCS 1045, SS 04Cr13Ni5Mo and NiCoCrFeNb0.45 EHEA with erosion time: a at impact speed of 20 m/s and impact angle of 30°, b at impact speed of 30 m/s and impact angle of 30°, c at impact speed of 25 m/s and impact angle of 20° d Cumulative mass loss as the function of impact angle and impact speed

Fig. 4 Scanning electron microscopy images of a, c SS 04Cr13Ni5Mo b, d NiCoCrFeNb0.45 EHEA after slurry erosion testing at 30° impingement angle

Fig. 5 a Scanning electron microscopy image and b high-magnification scanning electron microscopy image of NiCoCrFeNb0.45 EHEA after slurry erosion testing at 30° impingement angle, c Roughness for different materials after corrosion

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Superior Slurry Erosion Behavior of a Casting NiCoCrFeNb_0.45 Eutectic High Entropy Alloy

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