Effect of Alloying Elements on the Structural Phase State of Hadfield Steel

Effect of the Dislocation Substructure Parameters of Hadfield Steel on Its Strain Hardening

“…The excess dislocation density grows along a similar curve with an increase in the degree of deformation by tension and rolling ( Figure 8 a). The obtained results are consistent with both the results of our previous studies [ 22 ], according to which, at ε = 40%, the scalar dislocation density in the Hadfield steel was about 1.2 × 10 13 m −2 , and with [ 36 ], where the dislocation density in the austenite before the martensitic transformation was found of the order of 10 13 m −2 at room temperature. However, it can be assumed that by increasing the accuracy of measurements of the scalar dislocation density in coils, it would be possible to obtain higher values of ρ.…”

“…It is important to note that the TEM analysis of the structure of Hadfield steel did not reveal martensite anywhere, all the observed reflections of diffraction patterns are reflections of the γ-phase ( Figure 7 and Figure 10 c). The structure of the steel remains γ-austenitic even at degrees of rolling deformation of 40% ( Figure 7 ) and higher, which is in full agreement with [ 11 , 20 , 22 ].…”

“…Samples for optic microscopy using Neophot-21 (Carl Zeiss, Jena, Germany) were prepared by mechanical and electrolytic polishing and etching as detailed in [ 22 ].…”

“…In the previous study [ 22 ], the patterns of changes in the microstructure and phase composition of high-manganese steel depending on the content of the main components (Mn, C) were established. An increase in C content in steel stabilizes austenite, thus, steels close in composition to Hadfield steel with Mn content from 10 wt.% to 18% and from 1.0–1.2 wt.% C, remain austenitic not only after hardening, but also after plastic deformation by rolling with a degree of deformation up to 60%.…”