Microstructure Evolution and Enhanced Wear Resistance of Al2CrFeNiMo High Entropy Alloy Coating Fabricated by Laser Cladding

IF 3.2 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Journal of Thermal Spray Technology Pub Date : 2024-04-29 DOI:10.1007/s11666-024-01768-6

Yali Gao, Sicheng Bai, Yan Tong, Pengyong Lu, Yu Liu, Dongdong Zhang

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Abstract

In order to enhance the hardness and wear resistance of Cr12MoV, Al₂CrFeNiMo was designed and successfully prepared by laser cladding. Phase, microstructure, hardness and wear characteristics of the coating were analyzed by x-ray diffractometer, scanning electron microscope, Vickers hardness tester and reciprocating wear tester. The results indicated that the coating was composed of BCC and FCC phases having high lattice distortion and dislocation density. Microstructure of the coating presented the equiaxed grain which was rich in Fe, Cr and existed the segregation of Mo, Al, Ni. The coating demonstrated high hardness, with the values of 600 HV_0.2, which was increased by 150% than that of the substrate. Compared with the substrate, the friction coefficient and wear volume of the coating were reduced by 48.9 and 91.32%, respectively. The wear mechanism of the coating was the abrasive wear. However, the substrate exhibited the serious adhesive wear besides the abrasive wear.

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通过激光熔覆制造的 Al2CrFeNiMo 高熵合金涂层的微观结构演变和更强的耐磨性

为了提高 Cr12MoV 的硬度和耐磨性，设计并成功地通过激光熔覆制备了 Al2CrFeNiMo。通过 X 射线衍射仪、扫描电子显微镜、维氏硬度计和往复磨损试验机分析了涂层的相位、微观结构、硬度和磨损特性。结果表明，涂层由 BCC 相和 FCC 相组成，具有较高的晶格畸变和位错密度。涂层的微观结构呈现等轴晶，富含铁、铬，并存在钼、铝、镍的偏析。涂层的硬度很高，达到 600 HV0.2，比基体的硬度提高了 150%。与基体相比，涂层的摩擦系数和磨损体积分别降低了 48.9% 和 91.32%。涂层的磨损机理是磨料磨损。然而，基底除了磨料磨损外，还表现出严重的粘着磨损。

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来源期刊

Journal of Thermal Spray Technology 工程技术-材料科学：膜

CiteScore

5.20

自引率

25.80%

发文量

198

审稿时长

2.6 months

期刊介绍： From the scientific to the practical, stay on top of advances in this fast-growing coating technology with ASM International''s Journal of Thermal Spray Technology. Critically reviewed scientific papers and engineering articles combine the best of new research with the latest applications and problem solving. A service of the ASM Thermal Spray Society (TSS), the Journal of Thermal Spray Technology covers all fundamental and practical aspects of thermal spray science, including processes, feedstock manufacture, and testing and characterization. The journal contains worldwide coverage of the latest research, products, equipment and process developments, and includes technical note case studies from real-time applications and in-depth topical reviews.