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Ảnh hưởng của thời gian già hóa ở 650 °C đối với vi cấu trúc của mối hàn laser không đồng nhất của hợp kim siêu bền GH159/GH4169
Tóm tắt
Nghiên cứu này đã khám phá vi cấu trúc phụ thuộc vào thời gian già hóa và cơ chế gia cường của mối hàn không đồng nhất giữa hợp kim siêu bền GH159 và GH4169. Mối hàn bao gồm ma trận γ-Ni, pha γ′ và γ″ ở quy mô nano, cacbua MC hạt và pha Laves sau khi hàn và già hóa ở 650 °C. Thời gian già hóa chủ yếu ảnh hưởng đến sự kết tủa, kích thước và biến đổi của pha gia cường. Các mối hàn già hóa trong thời gian ngắn (≤ 25 h); hàm lượng của các pha gia cường nhỏ kích thước γ′ và γ″ tăng dần theo thời gian già hóa. Điều này có thể tăng độ cứng vi mô của tâm mối hàn từ 252 HV (chưa già hóa) lên 396 HV (già hóa trong 25 h). Với thời gian già hóa dài hơn (≥ 600 h), pha Laves được tạo ra trong quá trình hàn và các pha ở quy mô nano kết tủa do quá trình già hóa sẽ bị thô hơn nghiệm trọng. Khi thời gian già hóa tăng lên 2000 h, pha ở quy mô nano γ′ càng chuyển đổi nhiều hơn thành pha δ, dẫn đến sự suy giảm hiệu suất. Tuy nhiên, pha δ có tác dụng "cắt" pha Laves, điều này có thể làm tinh chỉnh pha Laves đến một mức độ nhất định.
Từ khóa
#Hợp kim siêu bền #Gh159 #Gh4169 #Mối hàn không đồng nhất #Vi cấu trúc #Gia cường #Thời gian già hóaTài liệu tham khảo
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