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Strontium modified high hard alloy and casting and heat treatment method thereof

A heat treatment method and alloy technology are applied in the manufacture of mechanical wear-resistant parts, the alloys of wear-resistant and corrosion-resistant cast iron and the preparation of their components, which can solve the problems of low strength index, insufficient impact toughness, low flexural strength, 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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  • Strontium modified high hard alloy and casting and heat treatment method thereof
  • Strontium modified high hard alloy and casting and heat treatment method thereof
  • Strontium modified high hard alloy and casting and heat treatment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 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 about 1:5, that is to form a Fe-SrO mixed briquette with Fe-14.24wt.%Sr. As a carrier for the modification of rare earth Sr.

[0050] 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:0.5wt.%; 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:

[0051] Place the Fe-SrO powder briquette on the bottom of the furnace, and the...

Embodiment 2

[0053] 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 1:20, that is to form a Fe-SrO mixed briquette with Fe-4.07wt.%Sr. 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: 0.05wt.%; 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:

[0055] Place the Fe-SrO po...

Embodiment 3

[0056]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.

[0057] 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: 0.3wt.%; 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:

[0058] Place the Fe-SrO powder briquette on the bot...

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Abstract

The invention relates to a strontium modified high hard alloy and casting and a heat treatment method thereof. The strontium modified high hard alloy is prepared from the elements in percentage by mass: 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, 0.04-1.6% of Sr, less than or equal to 0.01% of S and P, and the balance of Fe, wherein the sum of C and B is 3.3-3.6%, the content ratio of C to Cr is 0.06-0.08, and the sum of Nb and V is 0.5-1.0%. The heat treatment method includes the steps that firstly, Fe-SrO and Fe-strontium nitrate powdercompacts or Fe-strontium carbonate powder compacts are prepared, an alloy is poured after being subjected to preparing, smelting and modification, then quenching-tempering treatment is adopted, and the pouring temperature is 1250-1300 DEG C. According to the strontium modified high hard alloy and casting and the heat treatment method thereof, the integral hardness HRC of a cast ingot reaches 65.8-70.2, the impact toughness reaches 10.2-18.0 J / cm<2>, and the bending strength reaches 960-1740 MPa.

Description

technical field [0001] The invention belongs to the field of high-hardness cast iron, and relates to a wear-resistant and corrosion-resistant cast iron alloy and a component preparation method of rare earth strontium-modified fine hard phase and supersaturated solid solution and martensitic matrix phase, which can be widely used in metallurgy and machinery Manufacture of mechanical wear-resistant parts in , chemical, mining 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 comp...

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 罗丰华赵忠新陈冲刘浪飞王哲何荧
Owner CENT SOUTH UNIV
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