| Autor: |
Kharitonov, N. V., Stepanov, G. V., Krasovskii, A. Ya. |
| Zdroj: |
Strength of Materials; September 1974, Vol. 6 Issue: 9 p1091-1095, 5p |
| Abstrakt: |
Conclusions 1.The pulsed loading of Armco iron samples with a shock wave (amplitude P=62 and 113 kbar) changes the configuration of the grains in a plane parallel to the direction of propagation of the wave, on average from 60×60µ to 80×40µ, and also causes the formation of mechanical twins with a density of between ?=900 twins/mm2 and ?=2800 twins/mm2 the extent of this effect being all the greater the higher the intensity and time of action of the loading wave. The grains are flattened in the direction of propagation of the shock wave. The deformation introduced by twinning is comparable with the total residual deformation of the sample.2.In steel 45 the banded rolling structure is disrupted under the action of a shock wave in a region close to the contact surface; this effect increases with rising pressure amplitude. Thus for an amplitude of P=62 kbar the maximum distance of the boundary of the zone of vanishing banded structure from the contact surface equals approximately 1.3 mm, while for P=113 kbar it is about 3 mm.3.The rise in the microhardness of the ferrite grains in steel 45 is analogous to that of the grains in Armco iron. However, in contrast to the Armco iron samples, the microhardness of which changes from 103 to 156 kg/mm2 as the shock load changes from P=0 to P=113 kbar, the microhardness of the ferrite of steel 45 changes from 128 to 156 kg/mm2 as the load changes from P=0 to P=101 kbar. |
| Databáze: |
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