Impact strengthening in a confined volume of liquid

Conclusions

• 1. The lattice constant of austenite in the standard from Kh23N18 steel water quenched from 1100°C is a=3.588±0.001 A.

• 2. With increasing degrees of plastic deformation the second-order stresses increase from 30 kg mm² in the blanks to 112 kg/mm² at ε=60% (tensile stresses).

• 3. The size of the blocks of coherent scattering in samples 1 and 2 could not be determined but exceeded 10³ A.

• 4. With increasing degrees of plastic deformation the dislocation density increases from 1.3 to 19.2·10¹⁰ cm⁻² for ε-60% at a depth of more than 100μ and in samples 1, 2, and 3 to 4.74·10¹² cm⁻² at ε=73%.

• 5. The changes in the characteristics of the fine structure, line broadening, dislocation density, and second-order stresses, are similar to the variation of hardness, and the mosaic block structure becomes finer.

This method of explosive forming and strengthening of pipes in a confined volume of liquid can be used to produce parts of complex shape with a high strength.