PSI - Issue 39

Atroshenko S.A. et al. / Procedia Structural Integrity 39 (2022) 3–8 Author name / Structural Integrity Procedia 00 (2019) 000–000

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b) Fig. 4. Microstructure in the center of the region 1 ( х 1000).

Table 3. Quantitative characteristics of the microstructure of rail steel in three areas of destruction. Area Grain size, µm Ferrite plate thickness, µm Cementite plate thickness, µm 1 28,89 1,24 0,18 2 22,57 0,87 0,11 3 5,75 0,72 0,07

A microanalysis of the dynamic recrystallization region, carried out with a Phenom microscope, showed an almost identical chemical composition both inside this region and outside it. Figure 5 shows the area where the analysis was performed, and Fig. 6 shows the spectrum of elements of the marked areas. As can be seen from fig. 5, the structure inside the region (the size of the lamellas of ferrite and cementite) is much smaller than outside.

Fig.5. The area of dynamic recrystallization inside the circle (point 1), the border separating this area (dark), and the area outside it (point 2); microanalysis was performed at these points.