Szczegóły publikacji
Opis bibliograficzny
Effect of high strain rate on the dislocation structure of microalloyed and IF steels — Wpływ dużej prędkości odkształcenia na strukturę dyslokacyjną stali mikrostopowej IF / M. STEFAŃSKA-KĄDZIELA, J. MAJTA, S. DYMEK, K. MUSZKA // Archives of Metallurgy and Materials / Polish Academy of Sciences. Committee of Metallurgy. Institute of Metallurgy and Materials Science ; ISSN 1733-3490. — 2007 — vol. 52 iss. 2, s. 223–229. — Bibliogr. s. 228–229. — Scientific seminar on Integrated study on the Foundations of Plastic Deformation of Metals (PLASTMET 2006) : Łancut, Poland, November 28–December 01, 2006
Autorzy (4)
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 34129 |
|---|---|
| Data dodania do BaDAP | 2007-09-13 |
| Rok publikacji | 2007 |
| Typ publikacji | referat w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Archives of Metallurgy and Materials |
Abstract
The problem of quality and quantity evaluation of dislocation structure under very high strain rates was analyzed. The investigation was performed for two steels of common application: high strength microalloyed Nb(Y) steel and interstitial free (IF) steel. Investigation of microalloyed steel allowed the analysis of dislocation structure evolution in strengthened material (both via precipitations and solid solution). In such conditions, the dislocation movement is difficult and forming substructures are significantly different from those observed in IF steel. In present studies, for suitable evaluation of dislocation structure, an attempt of modification of existing relationships was made. Bergstrom’s proposition was utilized and relationships between dislocation cell size and mean dislocation density were determined. The axisymmetrical compression tests were performed with different strain rates at room temperature using static and dynamic testing machines and dropweight. The analysis of microstructure of deformed materials was also performed using transmission electron microscopy (TEM). The estimation of the effect of strain rate on microstructure evolution and, first of all, on dislocation cell structure, was made. It was observed that dislocation structure evolution depends on thermomechanical history of deformed material, strain and strain rate. On the basis of measurements and characteristics of dislocation structure and using B e r g s t r o m’s model it is possible to determine the total dislocation density, taking into account basic process parameters including strain rate under dynamic loading conditions. Obtained results showed a good accuracy of established model to estimate dislocation density on the basis of dislocation cell size.
