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Strontium nitrate modified toughened high-hardness alloy and casting method thereof

A technology of strontium nitrate and high hardness, which is applied in the manufacture of wear-resistant parts, the alloy of wear-resistant and corrosion-resistant cast iron and the preparation of its components, and can solve the problems of low strength index, low bending strength, insufficient impact toughness, etc.

Inactive Publication Date: 2018-10-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 nitrate modified toughened high-hardness alloy and casting method thereof
  • Strontium nitrate modified toughened high-hardness alloy and casting method thereof
  • Strontium nitrate modified toughened high-hardness alloy and casting method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Embodiment 1. After iron powder and strontium nitrate powder are uniformly mixed, molded into a powder briquette. The weight ratio of strontium nitrate powder to iron powder is approximately 1:3, that is to form Fe-strontium nitrate mixed briquette of Fe-10.46wt.%Sr, which is used as a carrier for the modification of rare earth Sr.

[0042] High-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferroniobium, ferrovanadium, industrial pure iron and the above-mentioned Fe-strontium nitrate mixed briquette 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: 1.0wt.%; 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.

[0043] After weighing the corresponding raw materials according to the composition requirements, induction melting and sand mold casting are adopted. The specific steps...

Embodiment 2

[0047] Embodiment 2. After iron powder and strontium nitrate powder are uniformly mixed, molded into a powder briquette. The weight ratio of strontium nitrate powder to iron powder is roughly 1:10, that is to form a Fe-strontium nitrate mixed briquette of Fe-3.80wt.% Sr, which is used as a carrier for the modification of rare earth Sr.

[0048] 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: 0.04wt.%; 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.

[0049] After weighing the corresponding raw materials according to the composition requirements, the vacuum induction furnace can be used for melting and water-cooled ...

Embodiment 3

[0053] Embodiment 3. After iron powder and strontium nitrate powder are uniformly mixed, molded into a powder briquette. The weight ratio of strontium nitrate powder to iron powder is approximately 1:8, that is to form a Fe-strontium nitrate mixed briquette of Fe-4.65wt.%Sr, which is used as a carrier for the modification of rare earth Sr.

[0054] 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: 0.8wt.%; 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.

[0055] After weighing the corresponding raw materials according to the composition requirements, induction melting and investment casting are adopted. The spec...

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Abstract

The invention relates to a strontium nitrate modified toughened high-hardness alloy and a casting method of the strontium nitrate modified toughened high-hardness alloy. The alloy comprises, by mass percentage, 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, less than 0.3 of Mn, 0.04-1.0% of Sr and the balance Fe, wherein by mass percentage, the total content of C andB is 3.3-3.6%, the C / Cr content ratio is 0.06-0.08, and the total content of Nb and V is 0.5-1.0%; and firstly, Fe-strontium nitrate powder is prepared and pressed into blocks, and the alloy is castand formed after alloy burdening, smelting and modification. The average hardness of a cast ingot of the strontium nitrate modified toughened high-hardness alloy is HRC 67.4-70.9, the impact toughnessreaches 12.4-16.6 J / cm<2>, and the bending strength reaches 1,218-1,546 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 fine hard phase modified by strontium nitrate, a supersaturated solid solution, and a martensitic matrix phase, and can be widely used in electric power , metallurgy, machinery, chemical and other industries in the manufacture of 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 broad 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 to their functions, such as Ti, ...

Claims

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Application Information

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IPC IPC(8): C22C38/32C22C38/26C22C38/24C22C38/04C22C33/06
CPCC22C38/32C21D2211/008C22C33/006C22C33/06C22C38/002C22C38/04C22C38/24C22C38/26
Inventor 罗丰华温家飞黄明初周海铭杜帅闵小兵
Owner CENT SOUTH UNIV
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