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Rare-earth strontium metamorphosed and toughened high-hardness alloy and casting method thereof

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

Inactive Publication Date: 2018-09-25
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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  • Rare-earth strontium metamorphosed and toughened high-hardness alloy and casting method thereof
  • Rare-earth strontium metamorphosed and toughened high-hardness alloy and casting method thereof
  • Rare-earth strontium metamorphosed and toughened high-hardness alloy and casting method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1. After iron powder and SrO powder are uniformly mixed, molded into a powder briquette. The weight ratio of SrO powder to iron powder is about 1:3, that is to form Fe-SrO mixed compact of Fe-21.36wt.%Sr. 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-SrO 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: 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.

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

[0044] Place the Fe-SrO powder briquette on the bottom of the furnace...

Embodiment 2

[0047] Embodiment 2. After iron powder and SrO powder are uniformly mixed, molded into a powder briquette. The weight ratio of SrO powder to iron powder is roughly 1:19, that is to form Fe-SrO mixed briquette with Fe-4.27wt.%Sr. 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: 0.02wt.%; 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.

[0049] 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:

[0050] Place the ...

Embodiment 3

[0053] Embodiment 3. After iron powder and SrO powder are uniformly mixed, molded into a powder briquette. The weight ratio of SrO powder to iron powder is roughly 1:10, that is to form Fe-SrO mixed briquette with Fe-7.77wt.%Sr. 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: 0.10wt.%; 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 specific steps are:

[0056] Place the Fe-SrO powder briquette...

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Abstract

The invention provides a rare-earth strontium metamorphosed and toughened high-hardness alloy and a casting method thereof. The alloy is prepared from the following elements in percentage by mass: 9.0to 13.0 percent of Cr, 2.6 to 2.9 percent of B, 0.7 to 0.9 percent of C, 0.4 to 0.8 percent of Nb, 0.4 to 0.8 percent of V, less than 0.3 percent of Mn, 0.02 to 0.6 percent of Sr and the balance of Fe, wherein the total sum of the C and the B is 3.3 to 3.6; the C / Cr mass ratio is 0.06 to 0.08; the total sum of the Nb and the V is 0.5 to 1.0. Firstly, prepared Fe-SrO powder is pressed into a blockfor later use, and materials of the alloy are prepared, melted and subjected to modification treatment and then are poured into the alloy. According to the rare-earth strontium metamorphosed and toughened high-hardness alloy, the average hardness HRC of a casting ingot is 66.5 to 69.6, the impact toughness reaches 12.5 to 16.3 J / cm<2> and the bending strength reaches 1260 to 1662 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 strontium-modified fine hard phase and supersaturated solid solution and martensitic matrix phase and its component preparation method, which can be widely used in electric power, Manufacture of mechanical wear-resistant parts in metallurgy, machinery, chemical industry and other industries. 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 great 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C22C38/26C22C38/24C22C38/04C22C33/06C21D6/00C21D1/18
CPCC22C38/32C21D1/18C21D6/002C22C33/06C22C38/005C22C38/04C22C38/24C22C38/26
Inventor 罗丰华赵忠新夏光明贺立卢静李益民
Owner CENT SOUTH UNIV
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