Bulletin of the Polish Academy of Sciences: Technical Sciences

Abstract

are coherent with the matrix, hinder the dislocation movement. The result of this effect is a high speed of strain hardening during stretching, which prevents the formation of a neck in the sample during the static tensile test, giving a high value of the Rp 0.2 /Rm ratio in the analyzed steel [3,4,7,[10][11][12][13][14][15][16].The increase in the strengthening speed at the MBIP formation site in the above-mentioned steel is due to an increase in the total density of dislocation due to the formation of microbands [4,7,[13][14][15][16][17][18][19][20][21]. With deformation of 5%, the dislocation in the slip plane along the major crystallographic directions was revealed. However, with plastic deformation of 10%, no clear formation of dislocation cells was observed, but a structure similar to Taylor's network [14].The deformation mechanism through DSBR (Fig. 1) is characterized by a significant slip during deformation and no mechanical twins or phase transitions were observed. This mechanism causes the formation of thin slip bands in the austenite grain. During deformation, the number of slip bands increases, which results in their densification [16,[20][21][22][23][24][25][26][27][28][29]. Table 1 presents a comparison of the strengthening mechanisms in Fe-Mn-Al-C type TRIPLEX steel. MATERIALS AND METHODSThe subject of the research was two plates of high-manganese steel of the TRIPLEX X98MnAlNbTi24-11 (X98) and X105MnAlSi24-11 (X105) type with high metallurgical purity, with a low concentration of gases and sulphur and phosphorus impurities (Table 2). Mischmetal