High-manganese CADI and heat treatment method thereof

A technology of high manganese and molten iron, applied in the field of wear-resistant materials, can solve the problems of poor wear uniformity of ductile iron, poor hardenability of ductile iron, poor uniformity of ductile iron hardness, etc., and achieves low cost, complete martensite transformation, and improved hardness. Effect

Active Publication Date: 2020-04-07
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned processes all have the disadvantages of poor hardenability of ductile iron, poor uniformity of inner hardness of ductile iron, and poor wear uniformity of ductile iron.

Method used

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  • High-manganese CADI and heat treatment method thereof
  • High-manganese CADI and heat treatment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A high-manganese CADI and its heat treatment method are characterized by adopting an electric furnace to smelt molten iron, and the specific preparation process steps are as follows:

[0023] ①First, use an intermediate frequency induction furnace to smelt molten iron with the following chemical composition (wt%): C: 3.10, Mn: 3.25, Si: 2.77, Cr: 1.02, Al: 0.21, Sb: 0.08, 0.031P, 0.026S, the balance Fe; heated to 1485℃, and then transferred to the ladle; pre-placed nodulizer and inoculant in the ladle, and pour the molten iron into the ladle for spheroidization and inoculation by the flushing method; The agent is composed of 82% rare earth magnesium silicon alloy (the chemical composition and mass fraction of rare earth magnesium silicon alloy: 6.02% RE, 8.86% Mg, 35.80% Si, 0.63% Ti, 0.55% Al, the balance is Fe and Trace other impurities) and 18% copper-magnesium alloy (the chemical composition of copper-magnesium alloy and its mass fraction: 32% Mg, 68% Cu), the added am...

Embodiment 2

[0026] A high-manganese CADI and its heat treatment method are characterized by adopting an electric furnace to smelt molten iron, and the specific preparation process steps are as follows:

[0027] ①First, use an intermediate frequency induction furnace to smelt molten iron with the following chemical composition (wt%): C: 3.35, Mn: 3.03, Si: 2.52, Cr: 1.10, Al: 0.24, Sb: 0.05, 0.030P, 0.029S, the balance Fe; heated to 1505℃, and then transferred to the ladle; pre-placed the nodulizer and inoculant in the ladle, and poured the molten iron into the ladle for spheroidization and inoculation by the flushing method; The agent is composed of 82% rare earth magnesium silicon alloy (the chemical composition and mass fraction of rare earth magnesium silicon alloy are: 8.15% RE, 7.05% Mg, 40.29% Si, 0.70% Ti, 0.61% Al, the balance is Fe and Trace other impurities) and 18% copper-magnesium alloy (the chemical composition of copper-magnesium alloy and its mass fraction: 35% Mg, 65% Cu), th...

Embodiment 3

[0030] A high-manganese CADI and its heat treatment method are characterized by adopting an electric furnace to smelt molten iron, and the specific preparation process steps are as follows:

[0031] ①First, use an intermediate frequency induction furnace to smelt molten iron with the following chemical composition (wt%): C: 3.19, Mn: 3.18, Si: 2.71, Cr: 1.06, Al: 0.23, Sb: 0.07, 0.029P, 0.024S, and the balance Fe; heated to 1490℃, then transferred to the ladle; pre-placed spheroidizing agent and inoculant in the ladle, using the flushing method to pour the molten iron into the ladle for spheroidization and inoculation treatment; The agent is composed of 82% rare earth magnesium silicon alloy (the chemical composition and mass fraction of rare earth magnesium silicon alloy: 7.11% RE, 7.94% Mg, 37.23% Si, 0.41% Ti, 0.38% Al, the balance is Fe and Trace other impurities) and 18% copper-magnesium alloy (the chemical composition of copper-magnesium alloy and its mass fraction: 33.8% M...

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Abstract

The invention discloses high-manganese CADI (Carbidic Austempered Ductile Iron) and a heat treatment method thereof, and belongs to the technical field of wear-resistant materials. Nodular cast iron (mass fraction, %) with the following chemical components is prepared by adopting a medium-frequency smelting electric furnace: 3.10-3.35 parts of C, 3.03-3.25 parts of Mn, 2.52-2.77 parts of Si, 1.02-1.10 parts of Cr, 0.21-0.24 part of Al, 0.05-0.08 parts of Sb, less than or equal to 0.035 parts of P, less than or equal to 0.030 parts of S and the balance of Fe. The obtained casting is heated to atemperature of 860-870 DEG C, then is subjected to heat preservation for 100-120 minutes, is taken out to be rapidly put into a nitrate solution with the temperature of 280-290 DEG C for heat preservation for 120-150 minutes, then is taken out to be rapidly put into liquid nitrogen with the temperature of -195 DEG C to -200 DEG C for cooling for 100-120 minutes, and is taken out to be put into the air for recovering to room temperature to obtain the high-manganese CADI.

Description

Technical field [0001] The invention discloses a method for preparing high manganese carbide-containing austempered ductile cast iron, in particular a heat treatment method for improving toughness and wear resistance, and belongs to the technical field of wear-resistant materials. Background technique [0002] Wear-resistant materials have been widely used in crushing and grinding equipment in the industrial field. They are indispensable and important consumable parts and are mainly produced by casting methods. With the development of industrial technology, the service environment of wear-resistant materials is becoming more and more severe, and the consumption is also increasing, resulting in a huge waste of resources and energy. Taking the ball mill of metallurgical mines as an example, in recent years, on the basis of Austempered Ductile Cast Iron (ADI), a small amount of strong carbide forming elements (such as Cr, Ti, V, Nb, etc.) have been formed to form uniform Distribute...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/04C22C37/10C22C37/06C22C33/10C21D5/00C21D1/607C21D6/04
CPCC21D1/607C21D5/00C21D6/04C22C33/10C22C37/04C22C37/06C22C37/10
Inventor 孙宇凡符寒光林健李辉杨鹏辉
Owner BEIJING UNIV OF TECH
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