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Rare earth lanthanum toughened high-hardness alloy and casting and heat treatment method thereof

A heat treatment method and rare earth lanthanum technology are used 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 low bending strength, insufficient impact toughness, and low strength index.

Inactive Publication Date: 2018-08-21
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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  • Rare earth lanthanum toughened high-hardness alloy and casting and heat treatment method thereof
  • Rare earth lanthanum toughened high-hardness alloy and casting and heat treatment method thereof
  • Rare earth lanthanum toughened high-hardness alloy and casting and heat treatment method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1. adopt iron powder and La 2 o 3 After the powder is evenly mixed, it is molded into a powder briquette. La 2 o 3 The weight ratio of powder to iron powder is approximately 1:5, that is, Fe-La of Fe-14.21wt.%La is formed 2 o 3 Mixed briquettes. As a carrier for the modification of rare earth La.

[0046] Select high-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferro-niobium, ferro-vanadium, 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: 2.9wt.%; C: 0.7wt.%; Nb: 0.4wt.%; V: 0.2wt.%; La: 0.5wt.% %; See Table 2 for the control of impurity elements. 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.

[0047] After weighing the corresponding raw materials according to the composition requirements, induction melting and sand mold casting ...

Embodiment 2

[0052] Embodiment 2. adopt iron powder and La 2 o 3 After the powder is evenly mixed, it is molded into a powder briquette. La 2 o 3 The weight ratio of powder to iron powder is roughly 1:20, that is, Fe-La of Fe-4.06wt.%La is formed 2 o 3 Mixed briquettes. As a carrier for the modification of rare earth La.

[0053] 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: 0.05wt.%; 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.

[0054] After weighing the corresponding raw materials according to the composition requirements, the vacuum induction furnace can be used for melting and water-cooled iron mold ca...

Embodiment 3

[0058] Embodiment 3. adopt iron powder and La 2 o 3 After the powder is evenly mixed, it is molded into a powder briquette. La 2 o 3 The weight ratio of powder to iron powder is approximately 1:10, that is, Fe-La of Fe-7.75wt.%La is formed 2 o 3 Mixed briquettes. As a carrier for the modification of rare earth La.

[0059] 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: 0.3wt.%. 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.

[0060] After weighing the corresponding raw materials according to the composition requirements, induction melting and investment casting are adopted. The speci...

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Abstract

The invention discloses rare earth lanthanum toughened high-hardness alloy and a casting and heat treatment method thereof. The rare earth lanthanum toughened high-hardness alloy comprises 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, smaller than 0.3 percent of Mn, 0.05to 0.5 percent of La, smaller than or equal to 0.01 percent of S and P, and Fe for the surplus, wherein the total percent of C and B is 3.3 to 3.6 percent; the content ratio of C / Cr is 0.06 to 0.08; the total percent of Nb and V is 0.5 to 1.0. The method comprises the steps of firstly preparing Fe-La2O3 powder compact, performing alloy batching, smelting and modification treatment, performing alloy casting, and then performing quenching-tempering treatment. The global hardness of a cast ingot reaches HRC 67.4 to 70.2, the impact toughness reaches 10.2 to 12.8J / cm<2>, and the bending strength reaches 960 to 1080MPa.

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 lanthanum-modified fine hard phase, supersaturated solid solution, and martensitic matrix phase and a component preparation method thereof, which can be widely used in electric power, Manufacture of mechanical wear-resistant parts in metallurgy, machinery, chemical industry 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 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 accordi...

Claims

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Application Information

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IPC IPC(8): C22C38/32C22C38/26C22C38/24C22C38/02C22C33/06C21D1/18
CPCC22C38/32C21D1/18C22C33/06C22C38/005C22C38/02C22C38/24C22C38/26
Inventor 罗丰华卢静温家飞杨昊吴卫文闵小兵
Owner CENT SOUTH UNIV
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