Phase Transformations and Recrystallization Processes during by Appel, F
By Appel, F
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Additional resources for Phase Transformations and Recrystallization Processes during Synthesis, Processing and Service of TiAl Alloys
Example text
5 Hardness (Hv) 184 179 Table 6. Mechanical properties and hardness of the cold-rolled and hot-rolled strips The textures of the rolled strips were similar to those of the as-received strips. Figure 11 shows the orientation densities along the -fibre of the surface and the centre regions of the rolled strips. The textures of the rolled strips were characterized by the strong -fibre. Cold rolled Hot rolled Fig. 11. Orientation densities along the -fibre of the surface and centre regions of the rolled strips Figure 12 shows the optical microstructures of the rolled strips annealed at 1123 K for 1 hr.
13. PT in the thermal influence zone by arc welding: (a) the schematic image of welding seam and PF(0001) for its different section; (b) quantitative treatment of PF (see detailed explanation in the text). between recrystallization and PT by a high rate of heating results in an absolute predominance of primary recrystallization (variant 1), though at some intermediate regimes of heat treatment two other variants are possible: recrystallization of deformed α-grains without their subsequent PT (variant 2) and PT of deformed α-grains without their preliminary recrystallization (variant 3).
23. Longitudinal section TEM micrograph showing individual grains and their orientations in the cold-rolled strips annealed at 1123 K for 3 s (Kim & Lee, 2002) Recrystallization of Dispersion-Strengthened Copper Alloys P=PD - PC = PD - 2b /R 39 (3) where: PD is the stored energy, PC is the opposing pressure from the boundary curvature b is the boundary energy R is the radius of the grain. In particle-strengthened alloys, the Zener pinning pressure (PZ) arises from the particles, and P can be expressed as follows (Humphreys & Hatherly, 1995): P=PD - PC – PZ = PD - 2b /R – 3FV b /d (4) where: FV is the volume fraction of the particles d is the particle size.