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

A heat treatment method and lanthanum carbonate technology are applied 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, which can solve the problems of insufficient impact toughness, low flexural strength, and low strength index.

Inactive Publication Date: 2018-08-14
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 toughened high-hardness alloy and casting and heat treatment method thereof
  • Lanthanum carbonate toughened high-hardness alloy and casting and heat treatment method thereof
  • Lanthanum 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 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.

[0047] 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.

[0048] After weighing the corresponding raw materials according to the composition requirements, induction melting and sand mold casting are adopted. The specific ste...

Embodiment 2

[0053] 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.

[0054] 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.

[0055] 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

[0059] 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 about 1:10, that is to form a Fe-lanthanum carbonate mixed briquette with Fe-5.53wt.%La. As a carrier for the modification of rare earth La.

[0060] Select high-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferroniobium, industrial pure iron and the above-mentioned Fe-La 2 o3 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.

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

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Abstract

Disclosed are lanthanum carbonate toughened high-hardness alloy and a casting and heat treatment method thereof. The elements of the alloy comprise, by mass percentage, 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, 0.01% or less of S and P, and the balance Fe, wherein the total mass percentage of C and B is 3.3-3.6%, the content ratio of C to Cr is 0.06-0.08, and the total mass percentage of Nb and V is 0.5-1.0%. Fe-carbonic acid bait powder briquettes are prepared at first, alloy burdening, smelting and modification treatment are carried out, and smelting, casting and heat treatment are carried out. According to overall prepared cast ingots, the hardness reaches HRC 65.1-68.9, the impact toughness reaches 12.5-16.4 J / cm<2>, and the bending strength reaches 1195-1540 MPa.

Description

technical field [0001] The invention belongs to the field of high-hardness wear-resistant cast iron, and relates to a wear-resistant and corrosion-resistant cast iron alloy and a component preparation method of a lanthanum carbonate-modified fine hard phase, a supersaturated solid solution, and a martensitic matrix phase, which 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 to ...

Claims

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Application Information

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IPC IPC(8): C22C38/32C22C38/26C22C38/24C22C38/04C22C33/04C21D1/18
CPCC22C38/32C21D1/18C22C33/04C22C38/005C22C38/04C22C38/24C22C38/26
Inventor 罗丰华吴若晴熊落保袁佩刘浪飞卢静
Owner CENT SOUTH UNIV
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