Chế tạo vật liệu phân tầng chức năng 316L/Inconel625/Ti6Al4V bằng phương pháp bổ sung ứng dụng gia nhiệt đồng bộ bằng laser

Wei Meng1, Wenhao Zhang1, Wang Zhang2, Xiaohui Yin1, Lijie Guo1, Bing Cui1
1School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan, China
2School of Material Science and Engineering, Shanghai Dianji University, Shanghai, China

Tóm tắt

Nghiên cứu này xem xét một loại vật liệu phân tầng chức năng, được chế tạo bằng phương pháp lắng đọng laser có định hướng và gia nhiệt đồng bộ, có sự chuyển đổi từ thép không gỉ 316L sang Ti6Al4V thông qua chuyển tiếp của Inconel625. Hành vi nứt, sự tiến hóa cấu trúc vi mô và độ cứng vi mô được xác định dựa trên vị trí trong vật liệu phân tầng. Kết quả cho thấy rằng các vết nứt phát sinh trong mẫu phân tầng 316L/Inconel625 và Inconel625/Ti6Al4V không được gia nhiệt trước, lần lượt được định nghĩa là nứt rắn và nứt lạnh. Các kết tủa của pha eutectic giàu Mo đã được xác định thí nghiệm là nguyên nhân chính gây ra nứt. Các pha kết tủa của các vật liệu gradient chuẩn bị có dạng tinh tế và đồng đều nhờ gia nhiệt đồng bộ bằng laser, và không phát hiện thấy vết nứt. Độ cứng đạt giá trị tối đa tại 70% Inconel625 + 30% Ti6Al4V. Nghiên cứu cho thấy chìa khóa để chế tạo vật liệu phân tầng 316L/Inconel625/Ti6Al4V bằng lắng đọng laser là giảm thiểu sự hình thành pha giàu Cr và Mo cũng như xu hướng nhiệt độ không đều.

Từ khóa

#vật liệu phân tầng chức năng #316L #Inconel625 #Ti6Al4V #lắng đọng laser #gia nhiệt đồng bộ

Tài liệu tham khảo

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