OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 24 No. 4 2022 Fig. 5. The structure of metal matrices in cast irons: a, b – SCh35; c, d – ChMN-35M; e, f – SChKM-45 (number 1 denotes graphite, 2 – pearlite, 3 – ferrite, 4 – cementite) а b c d e f Ta b l e 4 Average values of microhardness of structural components in SCh35, ChMN-35M and SChKM-45 alloys Microhardness Cast iron grade SCh35 ChMN-35M SChKM-45 Ferrite 195 235 270 Perlite 290 315 370 reduces the sensitivity of gray cast irons to stress concentrators. The fractures of samples made of SCh35 cast iron (Fig. 6, a) and ChMN-35M cast iron (Fig. 6, b) both in the zones of initiation and in the zones of crack propagation are the same. The destruction predominantly occurs according to the transcrystalline mechanism with an insignificant fraction of the intercrystalline component [11, 27, 39].
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