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Lanthanum carbonate modified and toughened high-hardness alloy and casting method thereof

A lanthanum carbonate, high hardness technology, applied in the field of mechanical wear parts manufacturing, alloy preparation, can solve the problems of insufficient impact toughness, low strength index, low bending strength and so on

Inactive Publication Date: 2018-10-19
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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  • Lanthanum carbonate modified and toughened high-hardness alloy and casting method thereof
  • Lanthanum carbonate modified and toughened high-hardness alloy and casting method thereof
  • Lanthanum carbonate modified and 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 lanthanum carbonate powder to mix uniformly, molded into a powder briquette. The weight ratio of lanthanum carbonate powder to iron powder is approximately 1:4, that is, Fe-lanthanum carbonate mixed compact of Fe-12.16wt.%La is formed. As a carrier for the modification of rare earth La.

[0042] High-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferroniobium, ferrovanadium, industrial pure iron and the above-mentioned Fe-lanthanum 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.%; La: 0.7wt.%; 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 ste...

Embodiment 2

[0048] Embodiment 2. After iron powder and lanthanum carbonate powder are uniformly mixed, molded into a powder briquette. The weight ratio of lanthanum carbonate powder to iron powder is roughly 1:19, that is, Fe-lanthanum carbonate mixed compact of Fe-3.04wt.%La is formed. As a carrier for the modification of rare earth La.

[0049] Select high-carbon ferrochrome, metal chromium, ferroboron, ferroniobium, industrial pure iron and the above-mentioned Fe-La 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.%; La: 0.03wt.%. 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.

[0050] After weighing the corresponding raw materials according to the composition requirements, the vacuum induction furnace can be used for melting and water-coo...

Embodiment 3

[0054] Embodiment 3. After iron powder and lanthanum carbonate powder are uniformly mixed, molded into a powder briquette. The weight ratio of lanthanum carbonate powder to iron powder is approximately 1:9, that is, Fe-lanthanum carbonate mixed compact of Fe-6.08wt.%La is formed. As a carrier for the modification of rare earth La.

[0055] Select high-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferroniobium, industrial pure iron and the above-mentioned Fe-La 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.%; La: 0.5wt.%. 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.

[0056] After weighing the corresponding raw materials according to the composition requirements, induction melting and investment casting are adopted...

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Abstract

Disclosed are lanthanum carbonate modified and toughened high-hardness alloy and a casting method thereof. The alloy comprises, by mass, 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, 0.03-0.7% of La and the balance Fe, wherein the total content of C and B is 3.3-3.6%, the content ratio of C to Cr is 0.06-0.08, and the total content of Nb and Vis 0.5-1.0%. Firstly, Fe-lanthanum carbonate powder briquettes are prepared, and after alloy burdening, smelting and modifying treatment, the alloy is cast. According to a cast ingot, the hardness isHRC66.2-70.0, the impact toughness reaches 10.7-14.6 J / cm<2>, and the bending strength reaches 1000-1345 MPa.

Description

technical field [0001] The invention belongs to the field of high-hardness and wear-resistant cast iron, and relates to a method for preparing an alloy of wear-resistant and corrosion-resistant cast iron with lanthanum carbonate metamorphic fine hard phase, supersaturated solid solution, and martensite matrix phase, which can be widely used in electric power and metallurgy Manufacture of mechanical wear-resistant parts in , machinery, chemical and other industries. 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 a prospect. [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 functions, such as Ti, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C22C38/04C22C38/26C22C38/24C22C33/06
CPCC22C38/32C22C33/006C22C33/06C22C38/005C22C38/04C22C38/24C22C38/26
Inventor 罗丰华卢静熊落保黄明初杜帅吴宁袁佩
Owner CENT SOUTH UNIV
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