High-wear-resistance carbide-containing austenitic ductile iron and preparation method thereof

Abstract

The invention discloses high-wear-resistance carbide-containing austenitic ductile iron and a preparation method thereof and belongs to the technical field of wear-resistant materials. In order to provide the high-wear-resistance carbide-containing austenitic ductile iron which is good in hardness and toughness, the formula of the carbide-containing austenitic ductile iron is improved. The high-wear-resistance carbide-containing austenitic ductile iron comprises, by weight percentage, 3.50-3.90% of C, 2.90-3.50% of Si, 1.30-1.70% of Mn, less than 0.08% of P, less than 0.012% of S, 0.01-0.04% of RE, 0.025-0.04% of Mg, 0.08-0.18% of Cr, 0.17-0.32% of V, 0.08-0.18% of Ti, 0.30-0.40% of Cu, 0.001-0.006% of B and the balance Fe, wherein RE is rare-earth metal and is preferably Y. The high-wear-resistance carbide-containing austenitic ductile iron has the advantages that the surface hardness of the high-wear-resistance carbide-containing austenitic ductile iron can reach above HRC62, the impact toughness of the high-wear-resistance carbide-containing austenitic ductile iron is more than 2-3 times of that of chromium-based grinding balls, the high-wear-resistance carbide-containing austenitic ductile iron is excellent in comprehensive performance, breaking and distortion during use are avoided, abrasion is only about 200g per ton, and the high-wear-resistance carbide-containing austenitic ductile iron is promising in application prospect in wear-resistant component fields such as metallurgical mine machinery, coal mine machinery, cement industry, engineering machinery, power generating industry and agricultural machinery.

Description

Technical field [0001] The invention belongs to the technical field of wear-resistant materials. Background technique [0002] The output of wear-resistant parts in China is more than 3 million tons. In addition to meeting domestic demand, the number of foreign demand is also increasing year by year. Take grinding balls as an example: grinding balls are widely used in mineral processing, cement and thermal power generation. It is mainly based on chromium, high, medium and low chromium balls. Low chromium balls are on the verge of being eliminated due to their low quality. Although high chromium balls have better performance, high chromium balls do not meet China’s national conditions. It is a chromium-poor country. On the other hand, a large number of high-chromium grinding ball materials will also pollute groundwater. Therefore, the use of new materials and new processes to replace high-chromium materials is a problem that needs to be solved at present. [0003] The matrix struct...

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Problems solved by technology

[0002] The output of wear-resistant parts in my country is more than 3 million tons. In addition to meeting domestic demand, the number of foreign demand is also increasing year by year. Take grinding balls as an example: grinding balls are widely used in mineral processing, cement and thermal power generation. At present, domestically produced grinding balls are mainly Chromium-based, high, medium and low chromium balls, low chromium balls are on the verge of being eliminated due to their low quality. Although high chromium balls have better performance, high chromium does not meet my country's national conditions. It is a chromium-poor country. On the other hand, a large amount of high-chromium grinding ball raw materials will pollute the groundwater. Therefore, the replacement of high-chromium materials with new materials and new processes is a problem that needs to be solved at present.

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