FIELD: metallurgy.
SUBSTANCE: here is disclosed procedure for thermal treatment of cast items or work pieces out of silumin AK7. The procedure consists in heating, conditioning and successive cooling. A work piece is heated and conditioned at temperature (0.4-0.7) teut. °C, where teut. °C is temperature of eutectic transformation of alloy, while successive cooling to temperature -10 -(-20) °C is performed at simultaneous effect of gas flow and acoustic field of sound range of frequencies with level of sound pressure within 140-160 dB. Grains are crumbled and intra-granular structure is formed where dislocation are built as ordered formations; micro-stresses are decreased at boundaries of phases division.
EFFECT: upgraded mechanical properties.
5 cl, 1 dwg, 1 tbl, 1 ex
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