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Erbium carbonate metamorphosed and toughened high-hardness alloy and casting method thereof

A technology of erbium carbonate and high hardness, which is used in the preparation of alloys and the manufacture of mechanical wear-resistant parts, and can solve the problems of low bending strength, insufficient impact toughness, and low strength indicators

Inactive Publication Date: 2018-09-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hardness of this type of alloy is high, but the impact toughness is insufficient, the strength index is low, and the bending strength is low, in the range of 346-477MPa, which limits the application of this alloy to some occasions where the external load is large and impact resistance is required.

Method used

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  • Erbium carbonate metamorphosed and toughened high-hardness alloy and casting method thereof
  • Erbium carbonate metamorphosed and toughened high-hardness alloy and casting method thereof
  • Erbium carbonate metamorphosed and toughened high-hardness alloy and casting method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1. After adopting iron powder and erbium carbonate powder to mix uniformly, molded into a powder briquette. The weight ratio of erbium carbonate powder to iron powder is approximately 1:4, that is to form Fe-erbium carbonate mixed compact of Fe-13.0wt.% Er, which is used as the carrier of rare earth Er modification.

[0041] High-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferroniobium, ferrovanadium, industrial pure iron and the above-mentioned Fe-erbium carbonate mixed briquettes are selected as raw materials, and the composition range is as follows: Cr: 10.0wt.%; B:

[0042] 2.9wt.%; C: 0.7wt.%; Nb: 0.4wt.%; V: 0.2wt.%; Er: 0.7wt.%; Small amounts of impurities such as Al, Mn, N, etc. do not cause fundamental changes in alloy properties and are therefore not listed in Table 2.

[0043] After weighing the corresponding raw materials according to the composition requirements, induction melting and sand mold casting are adopted. The specific st...

Embodiment 2

[0048] Embodiment 2. After adopting iron powder and erbium carbonate powder to mix uniformly, molded into a powder briquette. The weight ratio of erbium carbonate powder to iron powder is roughly 1:19, that is to form Fe-erbium carbonate mixed compact of Fe-3.25wt.% Er, which is used as the carrier of rare earth Er modification.

[0049] Select high-carbon ferrochrome, metal chromium, ferroboron, ferroniobium, industrial pure iron and the above-mentioned Fe-Er 2 o 3 Mixed briquettes are raw materials, and the composition range is as follows: Cr: 10.0wt.%; B: 2.7wt.%; C:

[0050] 0.7wt.%; Nb: 0.5wt.%; Er: 0.03wt.%; See Table 2 for the control of impurity elements. Small amounts of impurities such as Al, Mn, N, etc. do not cause fundamental changes in alloy properties and are therefore not listed in Table 2.

[0051] After weighing the corresponding raw materials according to the composition requirements, the vacuum induction furnace can be used for melting and water-cooled i...

Embodiment 3

[0055] Embodiment 3. After adopting iron powder and erbium carbonate powder to mix uniformly, molded into a powder briquette. The weight ratio of erbium carbonate powder to iron powder is roughly 1:9, that is to form Fe-erbium carbonate mixed compact of Fe-6.50wt.% Er, which is used as the carrier of rare earth Er modification.

[0056] Select high-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferroniobium, industrial pure iron and the above-mentioned Fe-Er 2 o 3 Mixed briquettes are used as raw materials, and the composition range is as follows: Cr: 10.0wt.%; B: 2.7wt.%; C: 0.8wt.%; Nb: 0.6wt.%; Er: 0.5wt.%; the control of impurity elements is shown in the table 2. Small amounts of impurities such as Al, Mn, N, etc. do not cause fundamental changes in alloy properties and are therefore not listed in Table 2.

[0057] After weighing the corresponding raw materials according to the composition requirements, induction melting and investment casting are adopted. Th...

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Abstract

The invention provides an erbium carbonate metamorphosed and toughened high-hardness alloy and a casting method thereof. The alloy is prepared from the following elements in percentage by mass: 9.0 to13.0 percent of Cr, 2.6 to 2.9 percent of B, 0.7 to 0.9 percent of C, 0.4 to 0.8 percent of Nb, 0.4 to 0.8 percent of V, less than 0.3 percent of Mn, 0.03 to 0.7 percent of Er, less than or equal to0.01 percent of S, less than or equal to 0.01 percent of P and the balance of Fe, wherein the total sum of the C and the B is 3.3 to 3.6; the C / Cr mass ratio is 0.06 to 0.08; the total sum of the Nb and the V is 0.5 to 1.0. Firstly, prepared Fe-erbium carbonate powder is pressed into a block, and materials of the alloy are prepared, melted and subjected to modification treatment and then are poured into the alloy. According to the erbium carbonate metamorphosed and toughened high-hardness alloy, the whole hardness HRC of a casting ingot is 66.2 to 70.0, the impact toughness reaches 10.7 to 14.6 J / cm<2> and the bending strength reaches 1000 to 1345MPa.

Description

technical field [0001] The invention belongs to the field of high-hardness and wear-resistant cast iron, and relates to a method for preparing an alloy of wear-resistant and corrosion-resistant cast iron with erbium carbonate metamorphic fine hard phase, supersaturated solid solution, and martensitic matrix phase, which can be widely used in electric power and metallurgy Manufacture of mechanical wear-resistant parts in , machinery, chemical and other industries. technical background [0002] Fe-Cr-B-C wear-resistant casting alloy is mainly composed of Fe 2 B or M 2 B is a hard phase, which has good toughness, high hardness, high corrosion resistance, good smelting-casting processability, and has very broad application prospects. [0003] Modification treatment is one of the effective methods to improve the microstructure and mechanical properties of Fe-Cr-B-C alloy. Modifiers can be divided into strong carbon, nitrogen, and sulfide forming elements according to their fun...

Claims

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Application Information

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IPC IPC(8): C22C38/32C22C38/26C22C38/24C22C38/04C22C33/06C21D6/00C21D1/18
CPCC22C38/32C21D1/18C21D6/002C22C33/06C22C38/005C22C38/04C22C38/24C22C38/26
Inventor 罗丰华罗硕罗弘瑞吴宁刘小洁王哲
Owner CENT SOUTH UNIV
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