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Erbium nitrate modified toughened high-hardness alloy and casting method thereof

A technology of erbium nitrate and high hardness, which is used in the manufacture of wear-resistant parts, alloys and components of wear-resistant and corrosion-resistant cast iron, and can solve problems such as low strength index, insufficient impact toughness, and low bending strength

Inactive Publication Date: 2018-08-24
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 nitrate modified toughened high-hardness alloy and casting method thereof
  • Erbium nitrate modified toughened high-hardness alloy and casting method thereof
  • Erbium nitrate modified toughened high-hardness alloy and casting method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Embodiment 1. After adopting iron powder and erbium nitrate powder to mix uniformly, molded into a powder briquette. The weight ratio of erbium nitrate powder to iron powder is about 1:3, that is to form Fe-erbium nitrate mixed compact with Fe-9.43wt.% Er. As the carrier of rare earth Er metamorphism.

[0042] High-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferroniobium, ferrovanadium, industrial pure iron and the above-mentioned Fe-erbium nitrate mixed compact are selected as raw materials, and the composition range is as follows: Cr: 10.0wt.%; B: 2.9wt .%; C: 0.7wt.%; Nb: 0.4wt.%; V: 0.2wt.%; Er: 1.0wt.%; 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 steps are:

[0044] Place the Fe-erbium...

Embodiment 2

[0047] Embodiment 2. After adopting iron powder and erbium nitrate powder to mix uniformly, molded into a powder briquette. The weight ratio of erbium nitrate powder to iron powder is about 1:10, that is to form Fe-erbium nitrate mixed compact of Fe-3.43wt.% Er. As the carrier of rare earth Er metamorphism.

[0048] Select high-carbon ferrochrome, metal chromium, 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: 0.7wt.%; Nb: 0.5wt.%; Er: 0.04wt.%; 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.

[0049] After weighing the corresponding raw materials according to the composition requirements, the vacuum induction furnace can be used for melting and water-cooled iron mold casti...

Embodiment 3

[0053] Embodiment 3. After adopting iron powder and erbium nitrate powder to mix uniformly, molded into powder briquettes. The weight ratio of erbium nitrate powder to iron powder is about 1:8, that is to form Fe-erbium nitrate mixed compact with Fe-4.19wt.% Er. As the carrier of rare earth Er metamorphism.

[0054] 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: 0.8wt.%; 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.

[0055] After weighing the corresponding raw materials according to the composition requirements, induction melting and investment casting are adopted. The specific steps are...

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Abstract

The invention discloses erbium nitrate modified toughened high-hardness alloy and a casting method thereof. The alloy comprises the elements of, by mass, 9.0-13.0% of Cr, 2.6-2.9% of B, 0.7-0.9% of C,0.4-0.8% of Nb, 0.4-0.8% of V, less than 0.3% of Mn, 0.04-1.0% of Er, less than or equal to 0.01% of S, less than or equal to 0.01% of P and the balance Fe, wherein the sum of C and B is 3.3-3.6%, the mass ratio of C to Cr is 0.06-0.08, and the sum of Nb and V is 0.5-1.0%. A Fe-erbium nitrate powder briquette is prepared at first, and alloy pouring is conducted after alloy blending, smelting andmodifying treatment. Through the erbium nitrate modified toughened high-hardness alloy and the casting method thereof, the global hardness of a cast ingot is 67.4-70.9 HRC, the impact toughness reaches 12.4-16.6 J / cm<2>, and the bending strength reaches 1218-1546 MPa.

Description

technical field [0001] The invention belongs to the field of high-hardness wear-resistant cast iron, and relates to a wear-resistant and corrosion-resistant cast iron alloy and a component preparation method of a fine hard phase modified by erbium nitrate, a supersaturated solid solution, and a martensitic matrix phase, and can be widely used in electric power , metallurgy, machinery, chemical and other industries in the manufacture of wear-resistant parts. 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 functions...

Claims

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Application Information

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IPC IPC(8): C22C38/32C22C38/26C22C38/24C22C38/04C22C33/06C21D1/18
CPCC22C38/32C21D1/18C22C33/06C22C38/005C22C38/04C22C38/24C22C38/26
Inventor 罗丰华杨昊李益民王铸博熊落保卢静
Owner CENT SOUTH UNIV
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