Abstract
Using the plasma transferred arc (PTA) process to conduct surface remelting, the surface region of flake graphite cast iron can be hardened. To study the effect of silicon content on the microstructure of the hardened surface layer, flake graphite cast iron specimen of about 3.1 ∼ 3.2 wt pet carbon and various silicon contents from 1.47 to 3.41 wt pet were selected for the PTA surface remelting experiment. The remelting current and voltage were set at 100 A and 32 V. The results show a rapidly solidified microstructure with large amounts of eutectic cementite. Reducing the silicon content increases the volume fraction of eutectic cementite and thus increases the hardness. The increase of cementite volume fraction with decreasing silicon content is linear. Reducing the silicon content is also effective in suppressing the formation of porosities.
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