Microstructure and Frictional Wear Behavior of Al0.6CoCrFeNiTi/TiC Cladding Layers

doi:10.3901/JME.2025.10.141

Abstract

Abstract: Al_0.6CoCrFeNiTi/TiC high-entropy alloy cladding layers were prepared by laser cladding to meet the wear-resistant need of continuous casting rollers. The effects of TiC precipitates on the microstructure and frictional wear behavior at different temperatures of the cladding layers were investigated. The results show that the HEA-C0 cladding layer (TiC precipitates free) is composed of A2 phase (Fe-Cr rich) with disordered BCC structure and B2 phase (Al-Ni-Ti rich) with ordered BCC structure. The matrix structure of cladding layer transforms to single A2 phase with the increase of TiC precipitates, due to the decrease of Ti content in solid solution, and the hardness of A2 phase decreases gradually. The wear rate of HEA-C0 cladding layer significantly increases with the elevated temperature, showing a strong temperature-sensitivity. The TiC precipitates exhibit a remarkable strengthening effect at high-temperature, but the decreased hardness of A2 phase hampers the wear resistance of the cladding layer. Combining the conflicting effects, the HEA-C0.5 (TiC partially precipitated) cladding layer presents a superior wear resistance from room temperature to 600 ℃. The wear mechanism of the high-entropy alloy cladding layer alters with the elevated temperature, which is dominated by fatigue wear and slight oxidation wear at 25 ℃, and adhesive wear and abrasive wear at 300 ℃, and oxidative wear and abrasive wear at 600 ℃.

Key words: high-entropy alloy, laser cladding, microstructure, frictional wear

CLC Number:

TG174

CHENG Jingyue, YAO Haihua, ZHAO Wanxin, YANG Yange, WANG Guohong, ZHOU Zheng. Microstructure and Frictional Wear Behavior of Al_0.6CoCrFeNiTi/TiC Cladding Layers[J]. Journal of Mechanical Engineering, 2025, 61(10): 141-151.

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Microstructure and Frictional Wear Behavior of Al_0.6CoCrFeNiTi/TiC Cladding Layers

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