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

A heat treatment method and cerium carbonate technology are applied in the manufacture of mechanical wear-resistant parts, and the preparation of wear-resistant and corrosion-resistant cast iron alloys and their components, which can solve the problems of insufficient impact toughness, low strength index, and low flexural strength.

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 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.

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

[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] Place th...

Embodiment 2

[0053] 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.

[0054] 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.

[0055] 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

[0059] 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.

[0060] Select high-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferroniobium, industrial pure iron and the above-mentioned Fe-Ce2 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.

[0061] After weighing the corresponding raw materials according to the composition requirements, induction melting and investment casting are adopted. The specif...

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Abstract

The invention provides a cerium carbonate toughened high-hardness alloy and a casting and heat treatment 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, less than or equal to0.01 percent of S, less than or equal to 0.01 percent of P 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; then the alloy is subjected to quenching-annealing treatment. According to the cerium carbonate toughened high-hardness alloy, the whole hardness HRC of a casting ingot is 66.9 to 70.4, the impact toughness reaches 12.9 to 17.0 J / cm<2> and the bending strength reaches 1242 to 1570 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 罗丰华赵甲正杨昊罗硕闵小兵秦健春
Owner CENT SOUTH UNIV
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