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High-hardness alloy modified and toughened through rare earth yttrium and casting method thereof

A high-hardness, alloy technology, used in the preparation of wear-resistant and corrosion-resistant cast iron alloys and their components, and the manufacture of mechanical wear-resistant parts, can solve the problems of insufficient impact toughness, low strength index, and low flexural strength.

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 rare earth yttrium and casting method thereof
  • High-hardness alloy modified and toughened through rare earth yttrium and casting method thereof
  • High-hardness alloy modified and toughened through rare earth yttrium and casting method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1. Using iron powder and Y 2 O 3 After the powder is evenly mixed, it is molded into powder compacts. Y 2 O 3 The weight ratio of powder to iron powder is roughly 1:3, i.e. Fe-Y forming Fe-19.71wt.%Y 2 O 3 Mixed briquette. As a carrier for rare earth Y metamorphism.

[0042] Select high-carbon ferrochromium, micro-carbon ferrochromium, ferroboron, ferroniobium, ferrovanadium, industrial pure iron and the above Fe-Y 2 O 3 The mixed briquette is used as the raw material, 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. A small amount of impurities such as Al, Mn, N, etc. will not cause fundamental changes in the properties of the alloy, so it is not listed in Table 2.

[0043] After weighing the corresponding raw materials according to the composition requirements, induction melting and sand mold casting are used. The specific steps are:...

Embodiment 2

[0047] Example 2. Using iron powder and Y 2 O 3 After the powder is evenly mixed, it is molded into powder compacts. Y 2 O 3 The weight ratio of powder to iron powder is roughly 1:19, i.e. Fe-Y forming Fe-3.94wt.%Y 2 O 3 Mixed briquette. As a carrier for rare earth Y metamorphism.

[0048] Select high carbon ferrochromium, metallic chromium, ferroboron, ferroniobium, industrial pure iron and the above Fe-Y 2 O 3 The mixed briquette is used as raw material, and the composition range is as follows: Cr: 10.0wt.%; B: 2.7wt.%; C: 0.7wt.%; Nb: 0.5wt.%; Y: 0.02wt.%; 2. A small amount of impurities such as Al, Mn, N, etc. will not cause fundamental changes in the properties of the alloy, so it is not listed in Table 2.

[0049] After weighing the corresponding raw materials according to the composition requirements, vacuum induction furnace smelting and water-cooled iron mold casting can be used. The specific steps are:

[0050] the Fe-Y 2 O 3 Powder compacts are placed ...

Embodiment 3

[0053] Example 3. Using iron powder and Y 2 O 3 After the powder is evenly mixed, it is molded into powder compacts. Y 2 O 3 The weight ratio of powder to iron powder is roughly 1:10, i.e. Fe-Y forming Fe-7.17wt.%Y 2 O 3 Mixed briquette. As a carrier for rare earth Y metamorphism.

[0054] Select high-carbon ferrochromium, micro-carbon ferrochromium, ferroboron, ferroniobium, industrial pure iron and the above Fe-Y 2 O 3 The mixed briquette is the raw material, and the composition range is as follows: Cr: 10.0wt.%; B: 2.7wt.%; C: 0.8wt.%; Nb: 0.6wt.%; Y: 0.10wt.%; 2. A small amount of impurities such as Al, Mn, N, etc. will not cause fundamental changes in the properties of the alloy, so it is not listed in Table 2.

[0055] After weighing the corresponding raw materials according to the composition requirements, induction melting and investment casting are used. The specific steps are:

[0056] the Fe-Y 2 O 3 Powder compacts are placed on the bottom of the furnac...

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Abstract

The invention provides a high-hardness alloy modified and toughened through rare earth yttrium 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, 0.02-0.6 of Y 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-Y2O3 powder is prepared and pressed into blocks, and after alloy dosing, smelting and modifying treatment, the alloy is cast. The average hardness HRC of ingots is 66.5-69.6, the impact toughness reaches 12.5-16.3 J / cm2, and the bending strength reaches 1260-1662 MPa.

Description

technical field [0001] The invention belongs to the field of high-hardness wear-resistant cast iron, and relates to an alloy of yttrium-modified fine hard phase, supersaturated solid solution, and martensite matrix phase, an alloy of wear-resistant and corrosion-resistant cast iron and a preparation method for its components, which can be widely used in electric power, Manufacturing of mechanical wear-resistant parts in metallurgy, machinery, chemical and other industries. technical background [0002] Fe-Cr-B-C wear-resistant casting alloys are mainly composed of Fe 2 B or M 2 B is a hard phase, with good toughness, high hardness, high corrosion resistance, good smelting-casting manufacturability, and broad prospects. [0003] Modification treatment is one of the effective methods to improve the microstructure and mechanical properties of Fe-Cr-B-C alloys. Modifiers can be divided into strong carbon, nitrogen, sulfide forming elements, such as Ti, V and other elements, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C22C38/26C22C38/24C22C38/04C22C33/06
CPCC22C38/32C22C33/06C22C38/005C22C38/04C22C38/24C22C38/26
Inventor 罗丰华闵小兵贺立孙金达刘浪飞王哲
Owner CENT SOUTH UNIV
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