OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 26 No. 1 2024 Fig. 8. Cracks for Expt. 9 at the wall surface of square hole (a); at the bottom surface of square hole (b) Fig. 9. Cracks at the wall surface of square hole for Expt. 14 (a); at the bottom surface of square hole for Expt. 14 (b); at the wall surface of square hole for Expt. 12 (c); at the bottom surface of square hole for Expt. 12 (d)
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