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Yttrium element metamorphic high-hardness alloy and casting method thereof

A high-hardness, alloy technology, applied in the manufacture of mechanical wear-resistant parts, wear-resistant and corrosion-resistant cast iron alloys and their components, can solve the problems of low bending strength, insufficient impact toughness, and low strength indicators

Active Publication Date: 2019-07-05
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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  • Yttrium element metamorphic high-hardness alloy and casting method thereof
  • Yttrium element metamorphic high-hardness alloy and casting method thereof
  • Yttrium element metamorphic high-hardness alloy and casting method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Embodiment 1. adopt iron powder and Y 2 o 3 After the powder is evenly mixed, it is molded into a powder briquette. Y 2 o 3 The mass ratio of powder to iron powder is roughly 1:3, that is, Fe-Y that forms Fe-19.71wt.%Y 2 o 3 Mixed briquettes. As the carrier of rare earth Y metamorphism.

[0047] Select high-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferro-niobium, ferro-vanadium, industrial pure iron and the above-mentioned Fe-Y 2 o 3 Mixed briquettes are raw materials, and the composition range is as follows: Cr: 10.0wt.%; B: 2.9wt.%; C: 0.7wt.%; Nb:

[0048] 0.4wt.%; V: 0.2wt.%; Y: 0.6wt.%; 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. The specific steps ...

Embodiment 2

[0050] Embodiment 2. adopt iron powder and Y 2 o 3 After the powder is evenly mixed, it is molded into a powder briquette. Y 2 o 3 The mass ratio of powder to iron powder is roughly 1:19, that is, Fe-Y that forms Fe-3.94wt.%Y 2 o 3 Mixed briquettes. As the carrier of rare earth Y metamorphism.

[0051] Select high-carbon ferrochrome, metal chromium, ferroboron, ferroniobium, industrial pure iron and the above-mentioned Fe-Y 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.%; Y: 0.02wt.%. 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, the vacuum induction furnace can be used for melting and water-cooled iron mold casting. The specific steps are:

[0052] Fe-Y 2 o 3 The powder briquette i...

Embodiment 3

[0053] Embodiment 3. adopt iron powder and Y 2 o 3 After the powder is evenly mixed, it is molded into a powder briquette. Y 2 o 3 The mass ratio of powder to iron powder is roughly 1:10, that is, Fe-Y that forms Fe-7.17wt.%Y 2 o 3 Mixed briquettes. As the carrier of rare earth Y metamorphism.

[0054] Select high-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferroniobium, industrial pure iron and the above-mentioned Fe-Y 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.%; Y: 0.10wt.%; 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 are:

[0055] Fe-Y 2 o 3The powder briquette is placed on the bottom of t...

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Abstract

The invention discloses yttrium element metamorphic high-hardness alloy and a casting method thereof. The alloy comprises 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, smaller than 0.3 of Mn, 0.02-1.6 of Y and the balance Fe; the sum of C and B is 3.3-3.6; the ratio of C to Cr is 0.06-0.08; the sum of Nb and V is 0.5-1.0. The casting method comprises the steps that a Fe-Y2O3, Fe-yttrium carbonate or Fe-yttrium nitrate powder briquette is prepared at first, and after alloy batching, smelting and modification, alloy casting is conducted, wherein the casting temperatureis 1250-1320 DEG C. According to the yttrium element metamorphic high-hardness alloy and the casting method thereof, the average hardness HRC of a cast ingot is 66.5-70.5, the impact toughness is 11.8-16.3 J / cm<2>, and the bending strength is 1260-1690 MPa.

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 yttrium metamorphic fine hard phase, supersaturated solid solution, and martensitic matrix phase and a component preparation method thereof, which can be widely used in electric power , metallurgy, machinery, chemical and other industries in the manufacture of mechanical wear-resistant parts. [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, and good smelting-casting processability. 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 o...

Claims

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Application Information

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IPC IPC(8): C22C38/32C22C38/26C22C38/24C22C38/04C22C33/06
CPCC22C38/32C22C38/26C22C38/24C22C38/04C22C38/005C22C33/06
Inventor 罗丰华王宸刘笑黄明初李国平赵林
Owner CENT SOUTH UNIV
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