| Autor: |
Gorelik, S. S., Gul', Yu. P., Yankovskii, V. M., Khallach, I. S. |
| Zdroj: |
Metal Science and Heat Treatment; July 1972, Vol. 13 Issue: 7-8 p537-540, 4p |
| Abstrakt: |
1.During continuous cooling of hot worked austenite and ferrite one observes primary, and in some cases secondary, recrystallization, which is evident from changes in the grain size and strength characteristics.2.Increasing the degree of deformation intensifies both stages of recrystallization during continuous cooling, particularly in the case of austenitic steel.To obtain maximum grain refining and uniformity of grain size it is necessary not only to use a large deformation but also to fix the structure at the end of primary crystallization by means of rapid cooling or low-temperature deformation in order to prevent secondary recrystallization.3.After the same deformation the recrystallization rate during continuous cooling is lower in the ferritic steel than in the austenitic steel, which is due to more even deformation resulting from the large number of active slip systems in ferritic steel and, as the result of this, the preferential development of polygonization processes in steel of this type.4.During continuous cooling of hot worked austenite the recrystallization nuclei are formed preferentially in the boundaries, unlike the recrystallization process during heating after cold deformation, where most of the nuclei are formed within the original grains. The difference is probably the result of intensive annihilation of defects within the austenite grains in the course of high-temperature deformation itself. |
| Databáze: |
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