NGHIÊN CỨU SỰ BIẾN ĐỔI TỔ CHỨC TRONG QUÁ TRÌNH IN 3D KIM LOẠI BẰNG LASER VỚI VẬT LIỆU INCONEL 625

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Tác giả: Xuân Tươi Đỗ, Tất Khoa Đoàn, Văn Văn Lê, Văn Châu Trần

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học & Công nghệ - Trường Đại học Công nghiệp Hà Nội, 2024

Mô tả vật lý: tr.67

Bộ sưu tập: Báo, Tạp chí

ID: 417178

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In recent years, there has been a notable increase in the utilization of Inconel 625 material in metal 3D printing, which employs laser beam technology, particularly in industrial applications. This trend is especially evident in situations where intricate components with exceptional strength, corrosion resistance, and thermal stability are required at elevated operational temperatures. The microstructures of Inconel 625-printed components significantly influence their mechanical properties, corrosion resistance, and overall performance. This study unveils the initial findings regarding microstructure transformations during the 3D printing process of Inconel 625 material, commencing from the initial powder particles to the formation of a single printed layer on the substrate. The research reveals that Inconel 625 powder particles, initially featuring an equiaxed grain structure, undergo rapid melting when combined with the substrate material, subsequently solidifying and resulting in the formation of needle-like and dendritic microstructures. These microstructural changes are attributed to the distinct heating regimes experienced during the powder particle formation and printing process. This research provides fundamental and practical insights into the microstructure evolution of Inconel 625 in laser-based directed energy deposition, serving as a crucial reference for future studies in this field.Vật liệu Inconel 625 với công nghệ in 3D kim loại sử dụng chùm tia laser ngày càng có nhiều ứng dụng trong công nghiệp đặc biệt với các ứng dụng đòi hỏi chi tiết có độ bền, khả năng chống ăn mòn, chống rão nhiệt ở nhiệt độ làm việc cao. Tổ chức tế vi có ảnh hưởng chủ đạo đến cơ tính, tính chống ăn mòn, khả năng làm việc của chi tiết in bằng vật liệu Inconel 625. Nghiên cứu này trình bày kết quả bước đầu của việc khảo sát sự biến đổi tổ chức trong quá trình in của vật liệu Inconel 625 từ hạt bột cơ sở ban đầu cho đến khi hình thành lớp in đầu tiên trên tấm nền. Nghiên cứu cho thấy hạt bột Inconel 625 từ tổ chức hạt đẳng trục bị nung chảy và hòa tan cùng với vật liệu tấm nền (cũng có tổ chức hạt đẳng trục) kết tinh lại với tốc độ nguội nhanh hình thành các tổ chức hình kim và nhánh cây. Sự khác nhau này được giải thích chủ yếu do chế độ nhiệt mà mỗi đối tượng trải qua trong quá trình hình thành hạt bột và quá trình in. Nghiên cứu cung cấp các thông tin học cơ bản, hữu ích về sự biến đổi tổ chức của Inconel 625 trong quá trình in 3D kim loại bằng chùm tia laser, là cơ sở quan trọng để tham khảo cho các nghiên cứu in 3D kim loại tiếp theo.

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