Composite inoculant used for grey cast iron and preparation method and application method of composite inoculant

Abstract

The invention discloses a composite inoculant used for grey cast iron and a preparation method and an application method of the composite inoculant, relating to cast iron alloy. The inoculant is an inoculation refiner that consists of Fe-Ce-Is-Ca intermediate alloy and Fe-B-V intermediate alloy and takes the shape of a nanocrystal sheet. The nanocrystal particle is smaller than 100nm, and the average thickness, the average width and the average length of the sheet respectively range between 0.3-0.5mm, 0.3-0.75mm and 0.9-1.6mm. The preparation method is a fast quenching melt spinning method. The application method is a metal fusion casting process. When used for crystal particle and tissue refining treatment on the grey cast iron alloy tissue of grey cast iron wear resistant parts for engineering machinery, the inoculant overcomes casting defects, and obviously refines matrix crystal particle and cementite phase, thus notably improving the comprehensive mechanical property of grey cast iron alloy.

Description

technical field [0001] The technical scheme of the invention relates to cast iron alloys, in particular to a composite inoculant for gray cast iron and its preparation method and application method. Background technique [0002] Gray cast iron is one of the most widely used metal materials. Gray cast iron refers to an alloy of iron, carbon, and silicon with a carbon content of 2.7-4.0%, a silicon content of 0.5-3%, and a total of manganese, phosphorus, and sulfur not exceeding 2%. 75-90% of the carbon content of gray cast iron exists in the form of flake graphite, and the fracture is dark gray. Gray cast iron has a low melting point (1145-1250°C), less shrinkage during solidification, compressive strength and hardness close to carbon steel, and good shock absorption. It is used to manufacture machine tool beds, cylinders, boxes and pumps, etc. Structure. [0003] The tensile strength of gray cast iron is generally 120-200MPa. As the amount of carbon and silicon decreases...

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Problems solved by technology

Same as the inoculants produced by conventional processes, the cast iron inoculants prepared above are smelted by ordinary smelting processes and the ingots are crushed into small pieces for use. There is still room for improvement in the grain and microstructure refinement of cast iron alloy matrix

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