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

A technology of cerium nitrate and high hardness, which is used in the manufacture of mechanical wear-resistant parts, alloys and components of wear-resistant and corrosion-resistant cast iron, and can solve problems such as low strength index, low bending strength, and insufficient impact toughness

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 nitrate metamorphosed and toughened high-hardness alloy and casting method thereof
  • Cerium nitrate metamorphosed and toughened high-hardness alloy and casting method thereof
  • Cerium nitrate metamorphosed and toughened high-hardness alloy and casting method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1. After mixing iron powder and cerium nitrate powder uniformly, they were molded into powder compacts. The weight ratio of cerium nitrate powder to iron powder is approximately 1:3, that is, Fe-8.07wt.% Ce Fe-cerium nitrate mixed compact is formed. As the carrier of rare earth Ce metamorphism.

[0042] High-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferroniobium, ferrovanadium, industrial pure iron and the above-mentioned Fe-cerium nitrate mixed briquette are selected as raw materials. The composition range is as follows: Cr: 10.0wt.%; B: 2.9wt %; C: 0.7wt.%; Nb: 0.4wt.%; V: 0.2wt.%; Ce: 1.0wt.%; control of impurity elements is shown in Table 2. A small amount of impurities such as Al, Mn, and N will not cause fundamental changes in the properties of the alloy, so they are 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 sp...

Embodiment 2

[0047] Example 2. After mixing iron powder and cerium nitrate powder uniformly, they were molded into powder compacts. The weight ratio of the cerium nitrate powder to the iron powder is approximately 1:10, that is, Fe-2.93wt.% Ce Fe-cerium nitrate mixed compact is formed. As the carrier of rare earth Ce metamorphism.

[0048] Use high-carbon ferrochrome, metallic chromium, ferroboron, ferroniobium, industrial pure iron and the above Fe-Ce 2 O 3 The mixed briquette is the raw material, and the composition range is as follows: Cr: 10.0wt.%; B: 2.7wt.%; C: 0.7wt.%; Nb: 0.5wt.%; Ce: 0.04wt.%; the control of impurity elements is shown in the table 2. A small amount of impurities such as Al, Mn, and N will not cause fundamental changes in the properties of the alloy, so they are 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 ...

Embodiment 3

[0053] Example 3. After iron powder and cerium nitrate powder are mixed uniformly, they are molded into powder compacts. The weight ratio of cerium nitrate powder to iron powder is approximately 1:8, that is, Fe-cerium nitrate mixed compact of Fe-3.59wt.% Ce is formed. As the carrier of rare earth Ce metamorphism.

[0054] Use high-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferroniobium, industrial pure iron and the above Fe-Ce 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.%; Ce: 0.8wt.%; the control of impurity elements is shown in the table 2. A small amount of impurities such as Al, Mn, and N will not cause fundamental changes in the properties of the alloy, so they are 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] Th...

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Abstract

The invention provides a cerium nitrate 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 to 13.0 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, 0.04 to 1.0 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-Ce2O3 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 nitrate metamorphosed and toughened high-hardness alloy, the average hardness HRC of a casting ingot is 67.4 to 70.9, the impact toughness reaches 12.4 to 16.6 J / cm<2> and the bending strength reaches 1218 to 1546 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 supersaturated solid solution and martensite matrix phase modified by cerium nitrate, and a preparation method for its components. It can be widely used in electric power , Metallurgy, machinery, chemical and other industries of mechanical wear parts manufacturing. technical background [0002] Fe-Cr-B-C wear-resistant casting alloy mainly uses Fe 2 B or M 2 B is a hard phase, with good toughness, high hardness, high corrosion resistance, good melting-casting technology, and very broad application prospects. [0003] Modification treatment is one of the effective methods to improve the structure and mechanical properties of Fe-Cr-B-C alloy. Modifiers can be divided into strong carbon, nitrogen, and sulfide forming elements, such as Ti and V, and strong supercooling elements, such as surface active ...

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 罗丰华罗弘瑞温家飞赵甲正闵小兵王哲
Owner CENT SOUTH UNIV
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