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

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

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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  • Rare-earth yttrium toughened high-hardness alloy and casting and heat treatment method thereof
  • Rare-earth yttrium toughened high-hardness alloy and casting and heat treatment method thereof
  • Rare-earth yttrium 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 Y 2 o 3 After the powder is evenly mixed, it is molded into a powder briquette. Y 2 o 3 The weight ratio of powder to iron powder is roughly 1:4, that is, Fe-Y that forms Fe-15.77wt.%Y 2 o 3 Mixed briquettes. As the carrier of rare earth Y metamorphism.

[0047] Select high-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferro-niobium, ferro-vanadium, industrial pure iron and the above-mentioned Fe-Y 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.%; Y: 0.6wt.% %; 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. The spe...

Embodiment 2

[0053] Embodiment 2. adopt iron powder and Y 2 o 3 After the powder is evenly mixed, it is molded into a powder briquette. Y 2 o 3 The weight ratio of powder to iron powder is roughly 1:20, that is, Fe-Y that forms Fe-3.75wt.%Y 2 o 3 Mixed briquettes. As the carrier of rare earth Y metamorphism.

[0054] Select high-carbon ferrochrome, metal chromium, ferroboron, ferroniobium, industrial pure iron and the above-mentioned Fe-Y 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.%; Y: 0.02wt.%. 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 mold casting. The specific steps are:

[0056] Fe-Y 2 o 3 The powder ...

Embodiment 3

[0059] Embodiment 3. adopt iron powder and Y 2 o 3 After the powder is evenly mixed, it is molded into a powder briquette. Y 2 o 3 The weight ratio of powder to iron powder is roughly 1:10, that is, Fe-Y that forms Fe-7.17wt.%Y 2 o 3 Mixed briquettes. As the carrier of rare earth Y metamorphism.

[0060] Select high-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferroniobium, industrial pure iron and the above-mentioned Fe-Y 2 o 3 The 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.%; Y: 0.1wt.%; 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 steps are:

[0062] Fe-Y 2 o 3 The powder briquette is placed on ...

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Abstract

The invention discloses a rare-earth yttrium toughened high-hardness alloy and a casting and heat treatment method thereof. The alloy comprises the following 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, 0.02-0.6% of Y, less than or equal to 0.01 of S, less than or equal to 0.01 of P and the balance Fe; and the sum of C andB 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. The method comprises steps that firstly, Fe-Y2O3 powder pressing blocks are prepared, the alloy is subjectedto dosing, smelting and modification treatment, then the alloy is subjected to casting, and then quenching-tempering treatment is adopted. According to a cast ingot of the rare-earth yttrium toughenedhigh-hardness alloy and the casting and heat treatment method thereof, the overall hardness is HRC 65.4-HRC 68.5, the impact toughness reaches 13.3-17.1 J per cm<2>, and the bending strength reaches1340-1742 MPa.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C22C38/26C22C38/24C22C38/04C22C33/06C21D6/00C21D1/18
CPCC22C38/32C21D1/18C21D6/002C21D6/005C22C33/06C22C38/005C22C38/04C22C38/24C22C38/26
Inventor 罗丰华罗弘瑞夏光明严淑群何荧秦健春
Owner CENT SOUTH UNIV
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