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Rare-earth erbium toughened high-hardness alloy and casting and heat treatment method thereof

A heat treatment method and alloy technology, which is applied in the preparation of wear-resistant and corrosion-resistant cast iron alloys and their components, and in the field of mechanical wear-resistant parts manufacturing, can solve the problems of low strength index, low bending strength, and insufficient impact toughness, etc.

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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  • Rare-earth erbium toughened high-hardness alloy and casting and heat treatment method thereof
  • Rare-earth erbium toughened high-hardness alloy and casting and heat treatment method thereof
  • Rare-earth erbium toughened high-hardness alloy and casting and heat treatment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1. adopt iron powder and Er 2 o 3 After the powder is evenly mixed, it is molded into a powder briquette. Er 2 o 3 The weight ratio of powder to iron powder is roughly 1:5, that is, Fe-Er of Fe-14.58wt.% Er is formed 2 o 3 Mixed briquettes. As the carrier of rare earth Er metamorphism.

[0047] Select high-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferro-niobium, ferro-vanadium, 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: 2.9wt.%; C: 0.7wt.%; Nb: 0.4wt.%; V: 0.2wt.%; Er: 0.8wt.% %; 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.

[0048] After weighing the corresponding raw materials according to the composition requirements, induction melting and sand mold casting are adopted...

Embodiment 2

[0053] Embodiment 2. adopt iron powder and Er 2 o 3 After the powder is evenly mixed, it is molded into a powder briquette. Er 2 o 3 The weight ratio of powder to iron powder is approximately 1:20, that is, Fe-Er of Fe-4.16wt.% Er is formed 2 o 3 Mixed briquettes. As the carrier of rare earth Er metamorphism.

[0054] 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: 0.03wt.%; 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, the vacuum induction furnace can be used for melting and water-cooled iron mo...

Embodiment 3

[0059] Embodiment 3. adopt iron powder and Er 2 o 3 After the powder is evenly mixed, it is molded into a powder briquette. Er 2 o 3 The weight ratio of iron powder to iron powder is roughly 1:10, that is, Fe-Er of Fe-7.95wt.% Er is formed 2 o 3 Mixed briquettes. As the carrier of rare earth Er metamorphism.

[0060] 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: 0.6wt.%; 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.

[0061] After weighing the corresponding raw materials according to the composition requirements, induction melting and investment casting are adopted. The specific st...

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Abstract

The invention provides a rare-earth erbium toughened high-hardness alloy and a casting and heat treatment method thereof. The alloy is prepared from the following elements in percentage by mass: 9.0 to 13.0 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 0.8 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 Nband the V is 0.5 to 1.0. Firstly, prepared Fe-erbium carbonate powder is pressed into a block for later use, and materials of the alloy are prepared, melted and subjected to modification treatment, and are melted, poured and subjected to heat treatment. According to the rare-earth erbium toughened high-hardness alloy, the whole hardness HRC of a casting ingot is 65.8 to 70.4, the impact toughnessreaches 13.1 to 16.9 J / cm<2> and the bending strength reaches 1328 to 1571 MPa.

Description

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

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 罗丰华牟楠温家飞闵小兵严淑群王哲
Owner CENT SOUTH UNIV
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