tailieunhanh - High Temperature Strain of Metals and Alloys Part 7

Tham khảo tài liệu 'high temperature strain of metals and alloys part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 88 I 6 High-temperature Deformation of Superalloys Changes in the Matrix of Alloys during Strain The specimens of industrial superalloys see Table were investigated in situ by means of the X-ray method described above transmission electron microscopy studies were also carried out. For this purpose the high-temperature tests were interrupted and thin films were prepared from the specimens Fig. . EI437B is a nickel-based superalloy widely used in gas turbine jet engines and also in various applications up to 1023K 750 C such as turbine blades wheels and afterburner parts. The specimens were solution treated for 1h at 1273K air cooled and aged for 16h at 973K. Figure presents the results of X-ray investigations on this superalloy. The loading of specimens results in an increase in the misorientation angle n and a decrease in the average subgrain size D. The mean values of the parameters under investigation are almost unchanged at the steady-state stage and are equal to 3 mrad and pm respectively. Consequently fragmentation of the Y crystallites is also intrinsic to superalloys. This is due to the formation Fig. Dependence of the elongation average subgrain size and subgrain misorientation angle on time for the EI437B superalloy. T 973K. Ơ 570MPa Ơ 700 MPa. Interaction of Dislocations and Particles 89 Fig. Dislocation sub-boundaries in the matrix of the tested EI437 superalloy. The steady-state stage of creep. T 973K Ơ 450MPa. X150000. of dislocation sub-boundaries in the Y matrix. Decrease in D and increase in n is observed when the applied stress increases. Transmission electron microscopy is difficult to apply to the alloy because it contains many small coherent Y particles. The contrast at the matrix-particle boundary is known to have a deformation origin and hence the borders of the particles seem to be fuzzy. The average particle size in EI437B superalloy was found to be 14nm after the initial heat treatment. The dimensions of the

TỪ KHÓA LIÊN QUAN
TÀI LIỆU MỚI ĐĂNG
8    192    0    20-05-2024
15    194    0    20-05-2024
33    139    0    20-05-2024
2    118    0    20-05-2024
24    115    0    20-05-2024
11    158    1    20-05-2024
crossorigin="anonymous">
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.