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Additional info for Bicycle Metallurgy for the Cyclist
2 As in the high-SFE aluminium, the dislocations in high-SFE ferrite have three-dimensional distribution in spite of the different crystal lattices, fcc for aluminium and bcc for ferrite. Plain carbon steel, mould casting. 1, because of the more complicated cooling conditions occurring during the casting. 3 When an external stress is applied to the crystal, the dislocations start moving, annihilating, multiplying and interacting, and trying to form configurations of maximum stability, that is, of minimum energy.
Austenitic nitrogen steel Fe-18Cr-14Mn-0,6N after 30% deformation at 400°C. 26 The increase of SFE at the temperatures of hot deformation is sufficient to make all dislocations become unit ones. These dislocations can move by climb and cross-slip in all the slip planes to form tangles and cells. The cells are similar to the cells of cold-deformed high-SFE alloys except for wider cell walls, the smaller misorientation between cells, and the larger number of dislocations in the cell interior in the hot-deformed low-SFE material.
The determining factors for the occurrence of dynamic recrystallization and the extent of dynamic softening are the nature of material (alloy composition and SFE value), the temperature, the amount of deformation, and the strain rate. Dynamic recrystallization can occur in commercial alloys such as austenitic-alloyed steels, heat-resistant nickel-based alloys, and brass during sufficiently high hot working. 1 Annealing of cold-deformed metals results in the decrease of the number of dislocations in the cell’s interior while the dislocation tangles in the cell walls change into more regular dislocation networks.
Bicycle Metallurgy for the Cyclist by Hayduk