Preparations of iron-based alloy coatings on grey cast iron through plasma transfer arc welding

Iron-based alloy coatings were deposited on grey cast iron through plasma transfer arc welding. Results showed that the iron-based alloy coatings are composed of pearlite, martensite, austenite, and secondary carbides. There formed a bonding transformation layer between coating and grey cast iron with the width of about 205 μm. The optimized plasma transfer arc current was 100 A with the coating’s microhardness of 749 Hv. Meanwhile, the bonding...