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Mô phỏng số và nghiên cứu thực nghiệm quy trình nấu chảy hồ chân không (VAR) cho hợp kim siêu bền GH4742 cỡ lớn
Tóm tắt
Mô hình hóa số và thí nghiệm công nghiệp được sử dụng để nghiên cứu toàn bộ quy trình nấu chảy hồ chân không (VAR) hợp kim siêu bền GH4742 cỡ 660 mm. Để tính toán trường điện từ, trường dòng chảy, trường nhiệt độ và sự thay đổi hình dạng của bể chảy trong toàn bộ quy trình VAR, một mô hình đối xứng trục 2D với các trường vật lý đa liên kết tương thích với các thí nghiệm công nghiệp đã được xây dựng. Cấu trúc vi mô và điều kiện phân bố nguyên tố trong phôi GH4742 lớn đã được phân tích kết hợp với thí nghiệm mổ phôi công nghiệp, và những vị trí có khả năng xảy ra khuyết tật freckle nhất đã được dự đoán. Theo nghiên cứu, bể chảy có hai trường dòng chảy theo chiều kim đồng hồ bị ảnh hưởng bởi lực nổi và lực Lorentz. Độ sâu của bể chảy từ từ tăng lên theo quá trình chảy, với độ sâu bể chảy tối đa là 0.32 m và độ rộng vùng bột là 0.16 m. Mặc dù sự phân bố nguyên tố của phôi chủ yếu là đồng nhất, nhưng có sự phân tách vi mô giữa các nhánh. Nơi freckle có khả năng xuất hiện nhất, tại tọa độ (0.322, 0.075), giá trị Rayleigh đạt 1.1. Đối với hình dạng của bể chảy và khoảng cách giữa các nhánh trong toàn bộ quá trình nấu chảy, các kết quả của thí nghiệm mổ phôi công nghiệp và kết quả mô phỏng cho thấy sự thống nhất tốt, chứng minh độ chính xác của tính toán về lịch sử nhiệt và cấu trúc vi mô đông đặc trong toàn bộ quá trình chảy. Hơn nữa, triển vọng kết hợp mô phỏng số với cơ sở dữ liệu vật liệu đặc biệt để dự đoán khuyết tật một cách chính xác được đề xuất.
Từ khóa
#Vacuum arc remelting #GH4742 superalloy #Numerical simulation #FreckleTài liệu tham khảo
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