Accession Number : AD0695320

Title :   INVESTIGATION OF THE FINE CRYSTAL STRUCTURE OF STEEL SUBJECTED TO SHAPING AT A HIGH RATE OF DEFORMATION,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Kononenko,V. G. ; Sandler,N. I. ; Kukol,V. V. ; Zaitsev,K. I.

Report Date : 25 MAR 1969

Pagination or Media Count : 15

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)

Descriptors :   (*STEEL, *HIGH ENERGY RATE FORMING), (*CRYSTAL LATTICES, DEFORMATION), HYDRAULIC PRESSES, COLD WORKING, LOADS(FORCES), CRYSTAL DEFECTS, STRAIN HARDENING, STRESSES, USSR

Subject Categories : Metallurgy and Metallography
      Fabrication Metallurgy
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE