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Lanthanum modified high-hardness alloy and casting method thereof

A high-hardness, alloy technology, applied in the preparation of wear-resistant and corrosion-resistant cast iron, and the manufacture of mechanical wear-resistant parts, can solve the problems of low bending strength, insufficient impact toughness, and low strength index

Active Publication Date: 2019-07-16
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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  • Lanthanum modified high-hardness alloy and casting method thereof
  • Lanthanum modified high-hardness alloy and casting method thereof
  • Lanthanum modified high-hardness alloy and casting method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment 1. adopt iron powder and La 2 o 3 After the powder is evenly mixed, it is molded into a powder briquette. La 2 o 3 The mass ratio of iron powder to iron powder is roughly 1:4, that is, Fe-La of Fe-17.05wt.%La is formed 2 o 3 Mixed briquettes. As a carrier for the modification of rare earth La.

[0054] Select high-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferro-niobium, ferro-vanadium, 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: 2.9wt.%; C: 0.7wt.%; Nb: 0.4wt.%; V: 0.2wt.%; La: 0.5wt.% %; 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. After weighing the corresponding raw materials according to the composition requirements, induction melting and sand mold casting are adopted....

Embodiment 2

[0057] Embodiment 2. adopt iron powder and La 2 o 3 After the powder is evenly mixed, it is molded into a powder briquette. La 2 o 3The mass ratio of iron powder to iron powder is roughly 1:20, that is, Fe-La of Fe-4.06wt.%La is formed 2 o 3 Mixed briquettes. As a carrier for the modification of rare earth La.

[0058] 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: 0.05wt.%; 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. 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 casting. ...

Embodiment 3

[0060] Embodiment 3. adopt iron powder and La 2 o 3 After the powder is evenly mixed, it is molded into a powder briquette. La 2 o 3 The mass ratio of iron powder to iron powder is roughly 1:10, that is, Fe-La of Fe-7.75wt.%La is formed 2 o 3 Mixed briquettes. As a carrier for the modification of rare earth La.

[0061] 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: 0.3wt.%. 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. After weighing the corresponding raw materials according to the composition requirements, induction melting and investment casting are adopted. The specific steps ar...

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Abstract

The invention discloses a lanthanum modified high-hardness alloy and a casting method thereof. The alloy comprises 9.0 to 13.0% of Cr, 2.6 to 2.9% of B, 0.7 to 0.9% of C, 0.4 to 0.8% of Nb, 0.4 to 0.8% of V, smaller than 0.3% of Mn, 0.03 to 0.7% of La, and the balance Fe; the total amount of C and B ranges from 3.3 to 3.6, the content ratio of C / Cr ranges from 0.06 to 0.08, and the total amount ofNb and V ranges from 0.5 to 1.0. Firstly, Fe-La2O3, Fe-lanthanum carbonate or Fe-lanthanum nitrate powder compacts are prepared, after alloy burdening, smelting and modifying treatment, alloy castingis carried out, the casting temperature ranges from 1250 to 1320 DEG C, the alloy HRC ranges from 66.2 to 71.0, the impact toughness reaches 8.6 to 14.6 J / cm<2>, and the bending strength reaches 800to 1345 MPa.

Description

technical field [0001] The invention belongs to the field of high-hardness wear-resistant cast iron, and relates to a preparation method of wear-resistant and corrosion-resistant cast iron composed of fine hard phases modified by rare earth lanthanum, supersaturated solid solution and martensitic matrix phase, which can be widely used in machinery, chemical industry, Manufacture of mechanical wear-resistant parts in electric power, metallurgy, and other industries. [0002] technical background [0003] 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. [0004] 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C22C38/04C22C38/26C22C38/24C22C33/06
CPCC22C38/32C22C38/005C22C38/04C22C38/26C22C38/24C22C33/06C22C33/006
Inventor 罗丰华卢静王冠刘浪飞吴卫文王哲
Owner CENT SOUTH UNIV
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