B. Žužek et alii, Frattura ed Integrità Strutturale, 34 (2015) 160-168; DOI: 10.3221/IGF-ESIS.34.17 163 Figure 2 : Microstructures of CCC specimens (A) , (C) and (E) and ESR specimens (B) , (D) and (F) of investigated spring steel in a longitudinal direction. All microstructures were revealed by Nital etching, with Figs. (E) and (F) over-etched to show the segregation phenomenon. R ESULTS AND DISCUSSION Microstructure icrostructure of examined spring steel was investigated using light microscope (LM) as well as scanning electron microscope (SEM). Microstructure of conventionally cast (CCC) and electro-slag remelted (ESR) spring steel after hot rolling and soft annealing is shown in Fig. 2. Microstructure for both charges of steel consists of fine M A B C D E F