tailieunhanh - High Temperature Strain of Metals and Alloys Part 6

Tham khảo tài liệu 'high temperature strain of metals and alloys part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 72 Ị 5 Simulation of the Parameters Evolution strain Fig. Dependence of strain and structural parameters on time for nickel. The computer simulation uses the set of 12 ordinary differential equations. Two curves in each of six graphs correspond to two intersecting systems of parallel slip planes. T 1073K Ơ1 Ơ2 . time t 0 deformation 71 72 0 dislocation density p1 p2 2 X 108 m 2 Results of Simulation 73 dislocation spacing in sub-boundaries Al A2 50 nm subgrain size D1 D2 3 pm coefficients of the dislocation multiplication and emission respectively s 2 X 104 m 1 ss 4 X 104 m 1 The test time is 5h X 104s. Comparison of the obtained results Fig. with the experimental data shows remarkable overall agreement. Further analysis of data from the model leads to some interesting conclusions There are some differences in how the processes in both plane sets proceed. One can see an increase in strain in Fig. . The steady-state stage of creep occurs earlier under the lower stress. The strain value of 2 is observed in X 104 s after the load has been applied. For comparison with the model data the experimental results are presented in Fig. and Fig. . The inter-dislocation spacings in Fig. were determined from X-ray measurement data as described in Chapter 2. There is an obvious fit of model and experimental data which is evidence that the physical model is adequate. Fig. Strain versus time for nickel tested at 1073K. To be compared with the first graph in Fig. . Two specimens. B Ơ1 10MPa C Ơ2 14MPa. 74 Ị 5 Simulation of the Parameters Evolution 0 5000 10000 15000 20000 Time s Fig. The sub-boundary dislocation spacing versus time for nickel tested at 1073K. To be compared with the third graph in Fig. . Experimental data for the same two specimens as in Fig. . The density of dislocations increases during the high-temperature strain from 2 X 108 m 2 to X 1011 m-2. The dislocation density increases very quickly

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