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Carbide-containing austempered ductile iron and preparation method thereof

A nodular cast iron and austempering technology, applied in the field of nodular cast iron, can solve problems such as difficult control of structure uniformity and stability, difficult production process operation, and improved wear resistance, achieving low cost, simple selection, and improved wear resistance Effect

Active Publication Date: 2016-01-27
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] Aiming at the problems that the wear resistance of austempering ductile iron containing carbide still needs to be improved, the production process is difficult to operate, or the uniformity and stability of the structure are difficult to control in the current technology, the purpose of the present invention is to provide a carbide-containing Austempering ductile iron and preparation method thereof

Method used

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  • Carbide-containing austempered ductile iron and preparation method thereof
  • Carbide-containing austempered ductile iron and preparation method thereof

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preparation example Construction

[0028] The present invention also provides a method for preparing the carbide-containing austempering ductile iron, including: ① preparation of raw materials and smelting in an intermediate frequency furnace; ② spheroidizing and inoculation treatment of molten iron; ③ austempering heat treatment. The specific process is as follows:

[0029]The first step of raw material preparation: the raw materials are pig iron, scrap steel, ferromolybdenum, ferromanganese, ferrovanadium, chromium, nickel, copper, silicon, etc., put the prepared raw materials into the intermediate frequency induction furnace, heat up and melt, and then release the balls to obtain the raw material of ductile cast iron. molten iron. The second step of nodularization and inoculation treatment: use FeSiMg8RE5 nodularizer and SiFe75 inoculant, the addition amount is 1.0-1.6% and 0.3-1.0% of the weight of the original molten iron of ductile iron, respectively, and the nodular cast iron after spheroidization and in...

Embodiment 1

[0031] The chemical composition of the austempering ductile iron containing carbides in this example is (wt.%): C3.45%, Si2.45%, Cr0.34%, Mn0.75%, Mo0.34%, V0.032 %, Ni0.25%, Cu0.19%, Mg0.018%, RE0.036%, S0.009%, P0.020%, Fe balance. The heat treatment system adopted by the CADI ductile iron is as follows: the austenitizing temperature is 880°C, the holding time is 1.5h;

Embodiment 2

[0035] The chemical composition of the austempering ductile iron containing carbides in this example is (wt.%): C3.43%, Si2.21%, Cr0.46%, Mn0.49%, Mo0.31%, V0.048 %, Ni0.43%, Cu0.16%, Mg0.019%, RE0.032%, S0.012%, P0.035%, Fe balance. The heat treatment system adopted by the CADI ductile iron is as follows: the austenitizing temperature is 920°C, the holding time is 1.5h;

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Abstract

The invention discloses carbide-containing austempered ductile iron and its preparation method. Chemical composition of the ductile iron comprises, by weight, 3.3-3.8% of C, 1.5-2.5% of Si, 0.2-0.7% of Cr, 0.4-1.0% of Mn, 0.2-0.6% of Mo, 0.02-0.08% of V, 0.2-0.5% of Ni, 0.15-0.30% of Cu, 0.015-0.030% of Mg, 0.02-0.05% of RE, S being less than or equal to 0.080%, P being less than or equal to 0.080% and the rest of Fe. The preparation method comprises the following steps: preparation of raw materials and intermediate frequency furnace smelting; spheroidizing and inoculation of an iron liquid; and austempering heat treatment. By adding a trace amount of V element and properly reducing content of Si, a fine and dispersive carbide structure is obtained. The structure can greatly raise wear resistance of the ductile iron. Meanwhile, by adding a few amount of Ni, impact property of the ductile iron is enhanced.

Description

Technical field: [0001] The invention relates to the technical field of nodular cast iron, in particular to a carbide-containing austempering nodular cast iron and a preparation method thereof. Background technique: [0002] In the current highly developed society, the consumption of wear-resistant materials is huge. According to statistics, only China consumes more than 3 million tons of metal wear-resistant materials every year. If the occurrence of wear is prevented and slowed down by using the theory of friction and wear, the annual Savings of more than $14 billion. Metal wear-resistant materials are mainly divided into manganese steel series, wear-resistant alloy steel series, high-chromium cast iron series, etc. According to different cost and use environment requirements, different metal wear-resistant materials can be selected. For example, the hammer head widely used in the ore and metallurgical industry is made of ZGMn13Cr2 high-manganese cast steel. The hammer he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/04C22C33/08C21D1/20C21D5/00
Inventor 胡小锋闫德胜戎利建
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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