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

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

Inactive Publication Date: 2019-08-09
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 toughened high-hardness alloy and casting and heat treatment method thereof
  • Lanthanum toughened high-hardness alloy and casting and heat treatment method thereof
  • Lanthanum toughened high-hardness alloy and casting and heat treatment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] 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 mass ratio of iron powder to iron powder is roughly 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.

[0055] Select high-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferro-niobium, ferro-vanadium, industrial pure iron and the above-mentioned Fe-La 2 o 3Mixed 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. After weighing the corresponding raw materials according to the composition requirements, induction melting and sand mold casting are adopted. ...

Embodiment 2

[0058] 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 mass ratio of iron 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.

[0059] High-carbon ferrochromium, metal chromium, ferroboron, ferro-niobium, industrial pure iron and the above-mentioned Fe-La2O3 mixed briquette are selected as raw materials, and the composition range is as follows: Cr: 10.0wt.%; B: 2.7wt.%; C: 0.7 wt.%; Nb: 0.5wt.%; La: 0.05wt.%; See Table 2 for impurity element control. 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. 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 casting. The specific st...

Embodiment 3

[0061] 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 mass ratio of iron powder to iron powder is roughly 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.

[0062] 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. After weighing the corresponding raw materials according to the composition requirements, induction melting and investment casting are adopted. The specific steps ar...

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Abstract

The invention discloses a lanthanum toughened high-hardness alloy and a casting and heat treatment method thereof. The lanthanum toughened high-hardness alloy comprises, by mass, Cr: 9.0-13.0%, B: 2.6-2.9%, C: 0.7-0.9%, Nb: 0.4-0.8%, V: 0.4-0.8%, Mn: less than or equal to 0.3%, La: 0.03-0.7%, S: less than or equal to 0.01%, P: less than or equal to 0.01%, and the balance Fe, wherein the sum of C and B is 3.3-3.6%, the ratio of C to Cr is 0.06-0.08 %, and the sum of Nb and V is 0.5-1.0%. Firstly, an Fe-La2O3 powder compact, an Fe-lanthanum carbonate powder compact or a lanthanum nitrate powdercompact are prepared, then after burdening, smelting and modification treatment of an alloy, the alloy is cast with the casting temperature of 1250-1320 DEG C, and quenching-tempering treatment is adopted. Integral hardness of the cast ingot reaches HRC 65.1-70.2, impact toughness reaches 10.2-16.4 J / cm<2>, and bending strength reaches 960-1540 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-modified and toughened fine hard phase, a supersaturated solid solution, and a martensite matrix phase, which can be widely used in Manufacture of mechanical wear-resistant parts in electric power, metallurgy, machinery, chemical industry and other industries. [0002] technical background [0003] 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. [0004] 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 element...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C22C38/26C22C38/24C22C38/04C22C33/04C21D1/18
CPCC21D1/18C22C33/04C22C38/005C22C38/04C22C38/24C22C38/26C22C38/32
Inventor 罗丰华吴若晴罗硕卢静王哲李益民
Owner CENT SOUTH UNIV
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