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Yttrium carbonate metamorphic toughened high hardness alloy and casting method thereof

A technology of yttrium carbonate and high hardness, which is used in the preparation of wear-resistant and corrosion-resistant cast iron alloys and their components, and in the field of wear-resistant parts manufacturing. It can solve problems such as low strength index, low bending strength, and insufficient impact toughness.

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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  • Yttrium carbonate metamorphic toughened high hardness alloy and casting method thereof
  • Yttrium carbonate metamorphic toughened high hardness alloy and casting method thereof
  • Yttrium carbonate metamorphic toughened high hardness alloy and casting method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1. After adopting iron powder and yttrium carbonate powder to mix uniformly, molded into powder briquettes. The weight ratio of yttrium carbonate powder to iron powder is about 1:3, that is to form Fe-yttrium carbonate mixed compact of Fe-10.8wt.%Y. As the carrier of rare earth Y metamorphism.

[0042] High-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferroniobium, ferrovanadium, industrial pure iron and the above-mentioned Fe-yttrium carbonate mixed briquette 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.%; Y: 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.

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

[0044] Place the Fe...

Embodiment 2

[0047] Embodiment 2. After iron powder and yttrium carbonate powder are uniformly mixed, molded into a powder briquette. The weight ratio of yttrium carbonate powder to iron powder is roughly 1:13, that is to form Fe-yttrium carbonate mixed briquettes of Fe-3.09wt.%Y. As the carrier of rare earth Y metamorphism.

[0048] 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: 0.08wt.%; 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.

[0049] 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:

[0050] Place the Fe-...

Embodiment 3

[0053] Embodiment 3. After adopting iron powder and yttrium carbonate powder to mix uniformly, molded into powder briquettes. The weight ratio of yttrium carbonate powder to iron powder is about 1:4, that is to form Fe-yttrium carbonate mixed briquette with Fe-8.64wt.%Y. As the carrier of rare earth Y metamorphism.

[0054] Select high-carbon ferrochrome, micro-carbon ferrochrome, 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: 0.8wt.%; Nb: 0.6wt.%; Y: 0.10wt.%; 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, induction melting and investment casting are adopted. The specific steps are:

[0056] Place the Fe-yttrium carbonate powde...

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Abstract

The invention discloses an yttrium carbonate metamorphic toughened high hardness alloy and a casting method thereof. The yttrium carbonate metamorphic toughened high hardness alloy comprises the elements of, 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 Y and the balance Fe. The total amount of C and B is 3.3-3.6, the content ratio of C / Cr is 0.06-0.08, and the total amount of Nb and V is 0.5-1.0. The casting method comprises the steps that first, Fe-yttrium carbonate powder is prepared and pressed into blocks, and the alloy is cast after alloy batching, smelting and metamorphosing treatment. The average hardness HRC of a cast ingot of the yttrium carbonate metamorphic toughened high hardness alloy is 66.92-70.3, the impact toughness reaches 12.0-16.0 J / cm<2>, and the bending strength reaches 1432-1690 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 fine hard phase modified by yttrium carbonate, 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 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 their fu...

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 罗丰华袁佩罗硕吴宁秦健春卢静
Owner CENT SOUTH UNIV
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