Vanadium-containing carbidic austempered ductile iron and preparation method thereof

Abstract

A vanadium-containing carbidic austempered ductile iron comprises the following ingredients in percent by mass: 3.20-3.70 percent of C, 2.50-3.30 percent of Si, 0.4-0.8 percent of Mn, less than or equal to 0.040 percent of P, less than or equal to 0.007 percent of S, 0.01-0.04 percent of Ce, 0.01-0.04 percent of Mg, 0.30-1.80 percent of Cr, 0.25-0.70 percent of V and the balance of Fe. The preparation method of the vanadium-containing carbidic austempered ductile iron comprises the following steps: (1), heating and smelting pig iron, steel scrap, ferromanganese and ferrovanadium; (2), placing a rare-earth magnesium nodularizer into a groove in the bottom of a ladle, placing a nucleating agent on the rare-earth magnesium nodularizer, casting for 10-30 s at the temperature of 1,350-1,430 DEG C, and cooling to obtain ductile iron; and (3), heating the cooled ductile iron to reach a temperature of 850-920 DEG C, keeping the temperature for 2-4 h, then placing the heated ductile iron into 45% KNO3+55% NaNO3 molten salt at the temperature of 280-320 DEG C, keeping the temperature for 1-3 h, taking out the ductile iron, and cooling the ductile iron to the ordinary temperature to obtain the vanadium-containing carbidic austempered ductile iron. The vanadium-containing carbidic austempered ductile iron is high in ductility and hardness and excellent in comprehensive mechanical property.

Description

Technical field [0001] The invention relates to a nodular cast iron and a preparation method thereof, in particular to a vanadium-containing carbide ausferrite nodular cast iron and a preparation method thereof, belonging to the field of metallurgical casting. Background technique [0002] At present, there are many kinds of wear-resistant materials used in metallurgy, mining and other industries, but many workpieces and equipment in these industries will quickly fail due to wear. Although material wear seldom causes catastrophic damage to metal workpieces, the economic losses caused by it are also astonishing. According to statistics, the annual loss caused by wear and tear in our country is more than 100 billion. Today, when global resources are increasingly depleted, this is a huge consumption. Different wear-resistant materials such as white cast iron, high manganese steel, nickel hard cast iron, and high chromium white cast iron have played a role in reducing unit material c...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of high hardness, low toughness, easy fracture and narrow application range in the prior art, and propose a vanadium-containing carbide austeric nodular cast iron with good comprehensive mechanical properties

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