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Cerium carbonate metamorphosed and toughened high-hardness alloy and casting method thereof

A technology of cerium 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 mechanical wear-resistant parts manufacturing. It can solve the problems of low bending strength, insufficient impact toughness, and low strength indicators.

Inactive Publication Date: 2018-09-25
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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  • Cerium carbonate metamorphosed and toughened high-hardness alloy and casting method thereof
  • Cerium carbonate metamorphosed and toughened high-hardness alloy and casting method thereof
  • Cerium carbonate metamorphosed and toughened high-hardness alloy and casting method thereof

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Experimental program
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Effect test

Embodiment 1

[0041] Embodiment 1. After iron powder and cerium carbonate powder are uniformly mixed, molded into a powder briquette. The weight ratio of cerium carbonate powder to iron powder is roughly 1:4, that is to form Fe-cerium carbonate mixed compact of Fe-12.18wt.%Ce. As a carrier for the modification of rare earth Ce.

[0042] High-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferroniobium, ferrovanadium, industrial pure iron and the above-mentioned Fe-cerium 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.%; Ce: 1.2wt.%; 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...

Embodiment 2

[0047] Embodiment 2. After iron powder and cerium carbonate powder are uniformly mixed, molded into a powder briquette. The weight ratio of cerium carbonate powder to iron powder is approximately 1:19, that is, Fe-cerium carbonate mixed briquettes of Fe-3.04wt.%Ce are formed. As a carrier for the modification of rare earth Ce.

[0048] Select high-carbon ferrochrome, metal chromium, ferroboron, ferroniobium, industrial pure iron and the above-mentioned Fe-Ce 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.%; Ce: 0.05wt.%. 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.

[0049] After weighing the corresponding raw materials according to the composition requirements, the vacuum induction furnace can be used for melting and water-co...

Embodiment 3

[0053] Embodiment 3. After iron powder and cerium carbonate powder are uniformly mixed, molded into a powder briquette. The weight ratio of cerium carbonate powder to iron powder is roughly 1:10, that is, Fe-cerium carbonate mixed briquettes of Fe-5.53wt.%Ce are formed. As a carrier for the modification of rare earth Ce.

[0054] Select high-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferroniobium, industrial pure iron and the above-mentioned Fe-Ce 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.%; Ce: 1.0wt.%; 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, induction melting and investment casting are adopted. The spec...

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Abstract

The invention provides a cerium carbonate metamorphosed and toughened high-hardness alloy and a casting method thereof. The alloy is prepared from the following elements in percentage by mass: 9.0 to13.0 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, 0.05 to 1.2 percent of Ce 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 Nb and the V is 0.5 to 1.0. Firstly, prepared Fe-cerium carbonate powder is pressed into a block, and materials of the alloy are prepared, melted and subjected to modification treatment and then are poured into the alloy. According to the cerium carbonate metamorphosed and toughened high-hardness alloy, the average hardness HRC of a casting ingot is 68.0 to 71.5, the impact toughness reaches 11.4 to 15.6 J / cm<2> and the bending strength reaches 1118 to 1446 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 cerium 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 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 t...

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 罗丰华贺立吴子恺杜帅秦健春闵小兵
Owner CENT SOUTH UNIV
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