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Erbium nitrate toughening high-hard alloy and casting and heat treatment method thereof

A heat treatment method and technology of erbium nitrate, applied in the fields of erbium nitrate toughened high-hard alloy and its casting and heat treatment, can solve the problems of low strength index, insufficient impact toughness, low bending strength, etc.

Inactive Publication Date: 2018-10-26
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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  • Erbium nitrate toughening high-hard alloy and casting and heat treatment method thereof
  • Erbium nitrate toughening high-hard alloy and casting and heat treatment method thereof
  • Erbium nitrate toughening high-hard alloy and casting and heat treatment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1. After adopting iron powder and erbium nitrate powder to mix uniformly, molded into a powder briquette. The weight ratio of erbium nitrate powder to iron powder is about 1:3, that is to form Fe-erbium nitrate mixed compact with Fe-9.43wt.% Er. As the carrier of rare earth Er metamorphism.

[0046] High-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferroniobium, ferrovanadium, industrial pure iron and the above-mentioned Fe-erbium nitrate mixed compact 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.%; Er: 0.6wt.%; 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 are adopted. The specific steps are:

[0048] Place the Fe-erbium...

Embodiment 2

[0052] Embodiment 2. After adopting iron powder and erbium nitrate powder to mix uniformly, molded into a powder briquette. The weight ratio of erbium nitrate powder to iron powder is about 1:10, that is to form Fe-erbium nitrate mixed compact of Fe-3.43wt.% Er. As the carrier of rare earth Er metamorphism.

[0053] Select high-carbon ferrochrome, metal chromium, ferroboron, ferroniobium, industrial pure iron and the above-mentioned Fe-Er 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.%; Er: 0.04wt.%; 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.

[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 casti...

Embodiment 3

[0058] Embodiment 3. After adopting iron powder and erbium nitrate powder to mix uniformly, molded into a powder briquette. The weight ratio of erbium nitrate powder to iron powder is about 1:8, that is to form Fe-erbium nitrate mixed compact with Fe-4.19wt.% Er. As the carrier of rare earth Er metamorphism.

[0059] Select high-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferroniobium, industrial pure iron and the above-mentioned Fe-Er 2 o 3Mixed 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.%; Er: 0.4wt.%; impurity element control 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 specific steps are:

[00...

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Abstract

The invention discloses an erbium nitrate toughening high-hard alloy and a casting and heat treatment method thereof. The erbium nitrate toughening high-hard 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, no more than 0.3% of Mn, 0.08-1.6% of Er, less than or equal to 0.01% of S and P, and the balance Fe. The total mass content of C and B is3.3-3.6 %; the component ratio of C to Cr is 0.06-0.08; and the total mass content of the Nb and V is 0.5-1.0%. Fe-carbonic acid erbium powder block pressing is prepared, proportion, smelting and modification of alloy are carried out, and smelting, casting and heat treatment are carried out. Global hardness of ingot casting prepared by the casting and heating treatment method reaches HRC66.3-67.8, impact toughness reaches 10.7-14J / cm<2>, and bending strength reaches 1096-1316MPa.

Description

technical background [0001] 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. [0002] 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, V and other elements, and strong component supercooling elements, such as surface active elements rare earth (RE), Mg, etc. [0003] The rare earth elements gather on the liquid-solid growth interface to limit the grain growth, so as to improve the hardness, strength and wear resistance of the alloy; and refine the structure, so that the borides appear broken network and granular distribution, and improve the impact toughness. Studies have shown th...

Claims

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Application Information

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IPC IPC(8): C22C38/32C22C38/26C22C38/24C22C38/04C22C33/06C21D6/00C21D1/18
CPCC22C38/32C21D1/18C21D6/002C21D6/005C22C33/06C22C38/005C22C38/04C22C38/24C22C38/26
Inventor 罗丰华温家飞罗硕周浩钧曹军吴卫文
Owner CENT SOUTH UNIV
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