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Vanadium-containing carbidic austempered ductile iron and preparation method thereof

A nodular cast iron and carbide technology, applied in the field of metallurgical casting, can solve the problems of low toughness, narrow application range, easy fracture, etc., achieve uniform structure distribution, improve comprehensive mechanical properties, suppress and avoid the formation of network carbides Effect

Inactive Publication Date: 2015-12-09
GUANGDONG INST OF MATERIALS & PROCESSING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Vanadium-containing carbidic austempered ductile iron and preparation method thereof
  • Vanadium-containing carbidic austempered ductile iron and preparation method thereof
  • Vanadium-containing carbidic austempered ductile iron and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Composition and mass percentage: C: 3.23; Si: 3.01; Mn: 0.56; P: 0.037; S: 0.006; Ce: 0.035; Mg: 0.023; Cr: 1.15; V: 0.28; the balance is iron.

[0031] (1) Melting: Put the configured pig iron, scrap steel, ferromanganese, ferrovanadium and other alloy charge into an intermediate frequency induction electric furnace, heat and melt into molten iron of ductile iron alloy, test and adjust the composition before the furnace, and the furnace temperature is about 1510℃.

[0032] (2) Spheroidizing and inoculating treatment of molten iron: using the spheroidizing inoculation method of rushing into the bag, placing 1.8% of the raw material mass of VNCR-80 rare earth magnesium spheroidizing agent in the bottom groove of the bag, and placing the VI- of 0.8% of the raw material mass on it. 70RE inoculant; before pouring, put 0.03% cerium oxide of the raw material quality in the cavity, then pouring alloy iron liquid, pouring temperature 1416℃, pouring time 24 seconds, after cooling to g...

Embodiment 2

[0035] Composition and mass percentage: C: 3.35; Si: 2.81; Mn: 0.57; P: 0.038; S: 0.006; Ce: 0.023; Mg: 0.013; Cr: 1.15; V: 0.50; the balance is iron.

[0036] (1) Melting: the same as in Example 1. The furnace temperature is 1530℃.

[0037] (2) Spheroidization and inoculation treatment of molten iron: same as in Example 1. The pouring temperature is 1425℃, the pouring time is 18 seconds, and the ductile iron is obtained after cooling.

[0038] (3) Salt bath austempering heat treatment: same as Example 1. The performance is shown in Table 1.

Embodiment 3

[0040] Composition and mass percentage: C: 3.37; Si: 2.79; Mn: 0.58; P: 0.038; S: 0.006; Ce: 0.019; Mg: 0.012; Cr: 1.15; V: 0.68; the balance is iron.

[0041] (1) Melting: the same as in Example 1. The furnace temperature is 1525℃.

[0042] (2) Spheroidization and inoculation treatment of molten iron: same as in Example 1. The pouring temperature is 1425℃, the pouring time is 18 seconds, and the ductile iron is obtained after cooling.

[0043] (3) Salt bath austempering heat treatment: same as Example 1. The performance is shown in Table 1.

[0044] Table 1 The performance of the vanadium-containing carbide austenitic ductile iron of the present invention

[0045]

[0046] Note: The abrasion test data is tested under the same working conditions, with a pressure of 1 kg and a time of 30 minutes.

[0047] (Mass loss rate M=△m / s.t).

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/04C22C37/10C22C33/08C21D1/20
Inventor 李继林郑开宏刘巧燕朱耀甘春雷王顺成农登张放王海艳
Owner GUANGDONG INST OF MATERIALS & PROCESSING
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