Tổ chức và tính chất của lớp phủ hợp kim entropy cao chế tạo bằng phương pháp phun phủ laser

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Tác giả: Xuân Nam Lý, Thanh Hùng Nguyễn, Văn Nghĩa Trần

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Journal of Science and Technique, 2022

Mô tả vật lý: tr.46

Bộ sưu tập: Metadata

ID: 330346

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FeMnNiCrCu0.5 high-entropy alloy (HEA) coating was prepared on the C45 steel by laser cladding. Constituent phase, microstructure and chemical composition of the coating was investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), respectively. The microhardness and corrosion resistance of the coating are also studied. Results showed that the HEA coating reveals a good metallurgical bonding to the substrate, and they consist of the heat-affected zone, bonding zone and cladding zone. The microstructure of the coating showed a typical dendrite crystal growing from the substrate. FeMnNiCrCu0.5 coating was composed a single face-center cubic (FCC) phase, and the surface hardness of the coating is 195 HV0.2. In 0.5M H2SO4 solution, the coating has better corrosion resistance than the substrate, which allows the HEA coating to be used as an anti-corrosion coating in engineering applications.Lớp phủ hợp kim entropy cao FeMnNiCrCu0.5 đã được chế tạo trên bề mặt thép C45 bằng phương pháp phun phủ laser (Laser Cladding). Nhiễu xạ tia X (XRD), hiển vi điện tử quét (SEM) và phân tích phổ phân tán năng lượng (EDS) được sử dụng để đánh giá cấu trúc pha, tổ chức tế vi và thành phần hoá học của lớp phủ. Độ cứng và tính chất chống ăn mòn của lớp phủ cũng được nghiên cứu bằng đo độ cứng tế vi và đo dòng ăn mòn Tafel. Kết quả chỉ ra rằng, một lớp phủ có liên kết tốt với thép nền được hình thành, cấu trúc lớp phủ gồm vùng ảnh hưởng nhiệt, vùng liên kết và vùng lớp phủ. Tổ chức tế vi của lớp phủ thể hiện một cấu trúc dạng nhánh cây điển hình phát triển từ tấm thép nền. Lớp phủ có cấu trúc một pha lập phương diện tâm (face-center cubic - FCC) với độ cứng lớp phủ khoảng 195 HV0.2. Trong môi trường axit H2SO4 0.5M, lớp phủ có tính chống ăn mòn tốt hơn thép nền C45, điều này cho phép nó có thể được sử dụng như một lớp phủ chống ăn mòn trong các ứng dụng kỹ thuật.

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