INVESTIGATION OF THE FINE CRYSTAL STRUCTURE OF STEEL SUBJECTED TO SHAPING AT A HIGH RATE OF DEFORMATION,
Abstract
The effect of strain rate on crystal lattice distortion was investigated on specimens of St. 10 and St. 45 carbon steels, and 30KhGSA low-alloy high-strength steel. X-ray diffraction pattern examination and microstress and microhardness measurements showed that impact straining at both 20 and -180 degrees C resulted in greater microstresses and microhardness than those produced with static straining. The effect was more pronounced with straining at low temperatures, e.g., at the maximum rate of straining (150 m/sec) at -180C, the level of microstresses was 50 percent higher than with straining at 20C. An analogous increase in the microhardness indicated that the steel strengthening followed a similar pattern. The increase in strain hardening with increasing strain rate was accompanied by a noticeable increase in lattice distortion without any substantial fragmentation of the blocks. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 25, 1969
- Accession Number
- AD0695320
Entities
People
- K. I. Zaitsev
- N. I. Sandler
- V. G. Kononenko
- V. V. Kukol
Organizations
- National Air and Space Intelligence Center