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High-hardness alloy modified and toughened through lanthanum nitrate and casting method thereof

A lanthanum nitrate, high-hardness technology is applied in the preparation of wear-resistant and corrosion-resistant cast iron alloys and components thereof, and in the field of wear-resistant parts manufacturing, and can solve the problems of insufficient impact toughness, low flexural strength, and low strength index.

Inactive Publication Date: 2018-10-26
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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  • High-hardness alloy modified and toughened through lanthanum nitrate and casting method thereof
  • High-hardness alloy modified and toughened through lanthanum nitrate and casting method thereof
  • High-hardness alloy modified and toughened through lanthanum nitrate and casting method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1. After adopting iron powder and lanthanum nitrate powder to mix uniformly, molded into a powder briquette. The weight ratio of lanthanum nitrate powder to iron powder is about 1:3, that is to form Fe-lanthanum nitrate mixed compact with Fe-8.02wt.%La. As a carrier for the modification of rare earth La.

[0042] High-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferroniobium, ferrovanadium, industrial pure iron and the above-mentioned Fe-lanthanum nitrate mixed briquettes 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.%; La: 0.6wt.%; 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]...

Embodiment 2

[0047] Embodiment 2. After iron powder and lanthanum nitrate powder are uniformly mixed, molded into a powder briquette. The weight ratio of lanthanum nitrate powder to iron powder is about 1:9, that is, Fe-lanthanum nitrate mixed compact of Fe-3.21wt.%La is formed. As a carrier for the modification of rare earth La.

[0048] Select high-carbon ferrochrome, metal chromium, ferroboron, ferroniobium, industrial pure iron and the above-mentioned Fe-La 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.%; La: 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 ...

Embodiment 3

[0054] Embodiment 3. After iron powder and lanthanum nitrate powder are uniformly mixed, molded into a powder briquette. The weight ratio of lanthanum nitrate powder to iron powder is approximately 1:5, that is, Fe-lanthanum nitrate mixed compact of Fe-5.35wt.%La is formed. As a carrier for the modification of rare earth La.

[0055] Select high-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferroniobium, industrial pure iron and the above-mentioned Fe-La 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.%; La: 0.4wt.%. 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.

[0056] After weighing the corresponding raw materials according to the composition requirements, induction melting and investment casting are adopted. The ...

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Abstract

The invention provides a high-hardness alloy modified and toughened through lanthanum nitrate and a casting method thereof. Elements of the alloy comprise, by content, 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, smaller than 0.3 of Mn, 0.04-0.6 of La and the balance Fe, wherein the total content of C and B is 3.3-3.6, the content ratio of C / Cr is 0.06-0.08, and the total content of Nb and V is 0.5-1.0. At first, Fe-La2O3 powder is prepared and pressed into blocks, and after alloy dosing, smelting and modifying treatment, the alloy is cast. The HRC of ingots is 67.5-69.0, the impact toughness reaches 8.9-12.2 J / cm2, and the bending strength reaches 900-1120 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 lanthanum 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 functi...

Claims

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Application Information

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IPC IPC(8): C22C38/32C22C38/26C22C38/24C22C38/04C22C33/06
CPCC22C38/32C22C33/06C22C38/005C22C38/04C22C38/24C22C38/26
Inventor 罗丰华罗弘瑞向剑波孙金达秦健春刘小洁
Owner CENT SOUTH UNIV
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