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

A heat treatment method, a technology of strontium carbonate, 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, can solve the problems of low strength index, low bending strength, and insufficient impact toughness, etc.

Inactive Publication Date: 2018-11-06
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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  • Strontium carbonate toughened high-hardness alloy and casting and heat treatment method thereof
  • Strontium carbonate toughened high-hardness alloy and casting and heat treatment method thereof
  • Strontium 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 iron powder and strontium carbonate powder are uniformly mixed, molded into a powder briquette. The weight ratio of strontium carbonate powder to iron powder is roughly 1:3, that is to form Fe-strontium carbonate mixed briquette of Fe-14.99wt.%Sr, which is used as a carrier for the modification of rare earth Sr.

[0047] High-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferroniobium, ferrovanadium, industrial pure iron and the above-mentioned Fe-strontium carbonate mixed briquettes 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.%; Sr: 1.6wt.%; 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.

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

Embodiment 2

[0053] Embodiment 2. After iron powder and strontium carbonate powder are uniformly mixed, molded into a powder briquette. The weight ratio of strontium carbonate powder to iron powder is roughly 1:13, that is to form Fe-strontium carbonate mixed briquette of Fe-4.28wt.%Sr, which is used as a carrier for the modification of rare earth Sr.

[0054] High-carbon ferrochromium, metallic chromium, ferroboron, ferroniobium, industrial pure iron and the above-mentioned Fe-SrO 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.%; Sr: 0.08wt.%; 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.

[0055] After weighing the corresponding raw materials according to the composition requirements, the vacuum induction furnace can be used for melting and water-cooled iron ...

Embodiment 3

[0059] Embodiment 3. After iron powder and strontium carbonate powder are uniformly mixed, molded into a powder briquette. The weight ratio of strontium carbonate powder to iron powder is roughly 1:10, that is to form Fe-strontium carbonate mixed briquette of Fe-5.45wt.%Sr, which is used as a carrier for the modification of rare earth Sr.

[0060] High-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferroniobium, industrial pure iron and the above-mentioned Fe-SrO mixed briquette are selected as raw materials, and the composition range is as follows: Cr: 10.0wt.%; B: 2.7wt.%; C : 0.8wt.%; Nb: 0.6wt.%; Sr: 0.1wt.%; 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.

[0061] 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 a strontium carbonate toughened high-hardness alloy and a casting and heat treatment method thereof. The alloy comprises, by mass percent, 9.0 to 13.0% of Cr, 2.6 to 2.9% of B,0.7 to 0.9% of C, 0.4 to 0.8% of Nb, 0.4 to 0.8% of V, smaller than 0.3% of Mn, 0.08 to 1.6% of Sr, not larger than 0.01% of S and P, and the balance Fe. The sum of C and B ranges from 3.3 to 3.6, the ratio of C to Cr ranges from 0.06 to 0.08, and the sum of Nb and V ranges from 0.5 to 1.0. The method comprises the steps that Fe-strontium carbonate powder is prepared firstly and is pressed into blocks, alloy burdening, smelting and modification are carried out, alloy casting is carried out, and quenching-tempering treatment is carried out; the whole hardness of a casting ingot reaches HRC 65.8 to 69.2, the impact toughness ranges from 12.7 to 16.7J / cm<2>, and the bending strength ranges from 1462 to 1740 MPa.

Description

technical field [0001] The invention belongs to the field of high-hardness and wear-resistant cast iron, and relates to a wear-resistant and corrosion-resistant cast iron alloy and a component preparation method of a strontium 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/06C22C35/00C21D1/18C21D6/00C22C38/02C22C38/04C22C38/24C22C38/26C22C38/32
CPCC22C33/06C21D1/18C21D6/002C21D6/005C21D6/008C22C35/00C22C35/005C22C38/002C22C38/02C22C38/04C22C38/24C22C38/26C22C38/32
Inventor 罗丰华吴子恺李益民王铸博牟楠闵小兵
Owner CENT SOUTH UNIV
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