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Erbium-carbonate toughened high-hardness alloy and casting and heat treatment method thereof

A heat treatment method and technology of erbium carbonate, 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 problems such as low strength index, low bending strength, and insufficient impact toughness

Inactive Publication Date: 2018-08-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1. After adopting iron powder and carbonic acid bait powder to mix, molded into powder briquettes. The weight ratio of carbonated bait powder to iron powder is approximately 1:3, that is to form Fe-carbonated bait mixed briquette with Fe-16.25wt.% Er, as a carrier for the deterioration of rare earth Er.

[0047] High-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferroniobium, ferrovanadium, industrial pure iron and the above-mentioned Fe-carbonate bait 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.%; Er: 1.6wt.%; 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.

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

[0049] Plac...

Embodiment 2

[0053] Embodiment 2. After adopting iron powder and carbonated bait powder to mix uniformly, molded into powder briquettes. The weight ratio of carbonated bait powder to iron powder is roughly 1:13, that is to form Fe-carbonated bait mixed briquette with Fe-4.64wt.% Er, 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: 0.08wt.%. 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 mol...

Embodiment 3

[0059] Embodiment 3. After adopting iron powder and carbonated bait powder to mix uniformly, molded into powder briquettes. The weight ratio of carbonated bait powder to iron powder is roughly 1:10, that is, Fe-carbonated bait mixed briquette of Fe-5.91wt.% Er is formed, which is used as a carrier for the deterioration of rare earth Er.

[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: 0.1wt.%; 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 ado...

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Abstract

The invention discloses an erbium-carbonate toughened high-hardness alloy and a casting and heat treatment method thereof. The alloy comprises the elements, by mass percentage: 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, 0.08-1.6% of Er, less than or equal to 0.01% of S and P and the balance Fe, wherein the total mass percentage of the C andthe B is 3.3-3.6%, the content ratio of the C to the Cr accounts for 0.06-0.08, the total mass percentage of the Nb and the V is 0.5-1.0%. The method comprises the steps of firstly carrying out briquetting on prepared Fe-erbium carbonate powder, then carrying out alloy proportioning, smelting and modification treatment, and carrying out smelting, casting and heat treatment. The erbium-carbonate toughened high-hardness alloy and the casting and heat treatment method thereof have the advantages that the overall hardness of a prepared cast ingot can reach HRC 65.8-69.2, the impact toughness can reach 12.7-16.7 J / cm<2>, and the bending strength can reach 1462-1740 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 a carbonated bait-modified fine hard phase, 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 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): C22C38/32C22C38/26C22C38/24C22C38/04C22C33/06C21D1/18
CPCC22C38/32C21D1/18C22C33/06C22C38/005C22C38/04C22C38/24C22C38/26
Inventor 罗丰华夏光明严淑群卢静熊落保王哲
Owner CENT SOUTH UNIV
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