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

A heat treatment method, strontium nitrate 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 insufficient impact toughness, low strength index, low bending strength, etc.

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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  • Strontium nitrate toughened high-hardness alloy and casting and heat treatment method thereof
  • Strontium nitrate toughened high-hardness alloy and casting and heat treatment method thereof
  • Strontium nitrate 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 nitrate powder are uniformly mixed, molded into a powder briquette. The weight ratio of strontium nitrate powder to iron powder is roughly 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.

[0047] 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.

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

Embodiment 2

[0053] 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, Fe-strontium nitrate mixed briquette of Fe-3.80wt.%Sr is formed, 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: 0.04wt.%; 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 mol...

Embodiment 3

[0059] 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, Fe-strontium nitrate mixed briquette of Fe-4.65wt.%Sr is formed, 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: 0.8wt.%; 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.

[0061] After weighing the corresponding raw materials according to the composition requirements, induction melting and investment casting are adopted. The spe...

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Abstract

The invention provides a strontium nitrate toughened high-hardness alloy and a casting and heat treatment method thereof. The alloy is prepared from the following elements in percentage by mass: 9.0 to 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, 0.04 to 1.0 percent of Sr, less than or equal to0.01 percent of S, less than or equal to 0.01 percent of P and the balance of Fe, wherein the total sum of the C and the B is 3.3 to 3.6; the C / Cr content ratio is 0.06 to 0.08; the total sum of theNb and the V is 0.5 to 1.0. Firstly, prepared Fe-strontium nitrate is pressed into a block, and materials of the alloy are prepared, melted and subjected to modification treatment and then are pouredinto the alloy; then the alloy is subjected to quenching-annealing treatment. According to the strontium nitrate toughened high-hardness alloy, the whole hardness HRC of a casting ingot is 66.5 to 70.0, the impact toughness reaches 13.8 to 18.0 J / cm<2> and the bending strength reaches 1336 to 1664 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 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 to t...

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 罗丰华夏光明严淑群贺立杨昊李益民
Owner CENT SOUTH UNIV
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