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Sr-toughened high-hardness alloy and casting method thereof

A high-hardness, alloy technology, applied in the field of high-hardness wear-resistant cast iron, can solve the problems of low strength index, low bending strength, insufficient impact toughness, etc.

Inactive 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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  • Sr-toughened high-hardness alloy and casting method thereof
  • Sr-toughened high-hardness alloy and casting method thereof
  • Sr-toughened high-hardness alloy and casting method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Embodiment 1. After iron powder and SrO powder are uniformly mixed, molded into a powder briquette. The mass ratio of SrO powder to iron powder is roughly 1:3, that is, a Fe-SrO mixed briquette of Fe-21.36wt.%Sr is formed. 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-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. After weighing the corresponding raw materials according to the composition requirements, induction melting and sand mold casting are adopted. The specific steps are:

[0048] Place the Fe-SrO powder briquette on the bottom of the furnace, ...

Embodiment 2

[0049] Embodiment 2. After iron powder and SrO powder are uniformly mixed, molded into a powder briquette. The mass ratio of SrO powder to iron powder is roughly 1:19, that is to form a Fe-SrO mixed briquette with Fe-4.27wt.%Sr. As a carrier for the modification of rare earth Sr.

[0050] 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. 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:

[0051] Place the Fe-SrO po...

Embodiment 3

[0052] Embodiment 3. After iron powder and SrO powder are uniformly mixed, molded into a powder briquette. The mass ratio of SrO powder to iron powder is roughly 1:10, that is to form a Fe-SrO mixed briquette with Fe-7.77wt.%Sr. As a carrier for the modification of rare earth Sr.

[0053] 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. After weighing the corresponding raw materials according to the composition requirements, induction melting and investment casting are adopted. The specific steps are:

[0054] Place the Fe-SrO powder briquette on the b...

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Abstract

The invention discloses a Sr-toughened high-hardness alloy and a casting method thereof. the alloy is prepared from elements, including, 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, 0.02-1.2 of Sr and the balance of Fe; the total quantity of C and B ranges from 3.3 to 3.6; the content ratio of C / Cr ranges from 0.06 to 0.08; the total quantity of Nband V ranges from 0.5 to 1.0. Firstly, Fe-SrO powder briquetting preparation is made, alloy ingredients are subjected to smelting and modification treatment for casting of the alloy, and the casting temperature ranges from 1,250 DEG C to 1,300 DEG C. The average hardness of cast ingots of the alloy ranges from HRC66.5 to HRC69.6, the impact toughness ranges from 12.5 J / cm<2> to 16.3 J / cm<2>, and the bending strength ranges from 1,260 MPa to 1,662 MPa.

Description

technical field [0001] The invention belongs to the field of high-hardness wear-resistant cast iron, and relates to a wear-resistant cast iron with strontium element toughened fine hard phase, supersaturated solid solution and martensitic matrix phase and a preparation method for its components, which can be used in electric power, metallurgy, machinery, Manufacture of mechanical wear-resistant parts in chemical industry and other industries. [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 other elements, and strong compone...

Claims

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Application Information

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IPC IPC(8): C22C38/32C22C38/26C22C38/24C22C38/04C22C33/06C21D6/00C21D1/18
CPCC21D1/18C21D6/002C22C33/06C22C38/005C22C38/04C22C38/24C22C38/26C22C38/32
Inventor 罗丰华赵甲正潘亚飞卢静唐紫薇李益民
Owner CENT SOUTH UNIV
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