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In-situ TaC particle and iron-based amorphous alloy synergistically strengthened medium-high manganese steel-based composite and preparation method thereof

A technology for iron-based amorphous alloys and composite materials is applied in the field of high-manganese steel-based composite materials and their preparation, and can solve the problems of difficulty in making complex special-shaped parts, low powder core skeleton strength, and high requirements for equipment and process conditions.

Inactive Publication Date: 2020-05-05
QINGHAI UNIV FOR NATITIES
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AI Technical Summary

Problems solved by technology

At present, the amorphous alloy systems studied at home and abroad mainly include Fe-based, Co-based, Ni-based, Ti-based, Zr-based, Cu-based, Mg-based, La-based, etc., but the common problems are small size, high brittleness, high production cost, High requirements on equipment and process conditions greatly limit the practical application range of related materials
Chinese patent (CN106282849) discloses a method for preparing amorphous composite structural steel by copper mold casting (material formula: C 0.02-0.2%; Mn 13%-16%; Si 3%-5%; Cr10%-12% ; rare earth Re 0~2%, the rest is Fe element), the prepared composite structural steel has good mechanical properties (fracture strength is 2430~3280MPa, fracture strain is 12.64~26.96%), but it should be used as a structural material For use, its yield strength is obviously low (400-500MPa), and it is easy to undergo plastic deformation under low working stress, so it is difficult to take advantage of its high fracture strength
The main disadvantages of this method are: it is not easy to make complex special-shaped parts; due to sand casting, there will be a large number of macro / micro defects in the composite material; the strength of the powder core skeleton is low, and under the action of casting impact, columnar carbides formed in situ uneven distribution

Method used

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  • In-situ TaC particle and iron-based amorphous alloy synergistically strengthened medium-high manganese steel-based composite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1. Tantalum powder and graphite powder according to the molar ratio M Ta : M C =1: 1.1 is weighed, then carry out high-energy ball milling (stainless steel ball; stainless steel ball mill tank; ball-to-material ratio is 10:1, rotating speed is 500r / min, and ball milling time is 40h), then obtains the product with high activity, high specific surface area TaC particle powder;

[0023] Step 2. Add a small amount of nickel powder (5% of the quality of the TaC particle powder) in the TaC particle powder obtained in step 1, and then carry out high-energy ball milling (the rotating speed is 300r / min, and the ball milling time is 10h) to obtain coated nickel layer of TaC particle powder;

[0024] Step 3. After step 2 finishes, add stainless steel grinding ball, iron powder and manganese powder (manganese powder accounts for 13% of the total powder quality of iron-manganese, the TaC particle of the coated nickel layer that step 3 obtains in ball mill jar again The powde...

Embodiment 2

[0029] Step 1. Tantalum powder and graphite powder according to the molar ratio M Ta : M C =1: 1.1 is weighed, then carry out high-energy ball milling (stainless steel ball; stainless steel ball mill tank; ball-to-material ratio is 10:1, rotating speed is 500r / min, and ball milling time is 40h), then obtains the product with high activity, high specific surface area TaC particle powder;

[0030] Step 2. Add a small amount of nickel powder (5% of the quality of the TaC particle powder) in the TaC particle powder obtained in step 1, and then carry out high-energy ball milling (the rotating speed is 300r / min, and the ball milling time is 10h) to obtain coated nickel layer of TaC particle powder;

[0031] Step 3. After step 2 finishes, add stainless steel grinding ball, iron powder and manganese powder (manganese powder accounts for 15% of the total powder quality of iron-manganese, the TaC particle of the coated nickel layer that step 3 obtains in ball mill jar again The powde...

Embodiment 3

[0037] Step 1. Tantalum powder and graphite powder according to the molar ratio M Ta : M C =1: 1.1 is weighed, then carry out high-energy ball milling (stainless steel ball; stainless steel ball mill tank; ball-to-material ratio is 10:1, rotating speed is 500r / min, and ball milling time is 40h), then obtains the product with high activity, high specific surface area TaC particle powder;

[0038] Step 2. Add a small amount of nickel powder (5% of the quality of the TaC particle powder) in the TaC particle powder obtained in step 1, and then carry out high-energy ball milling (the rotating speed is 300r / min, and the ball milling time is 10h) to obtain coated nickel layer of TaC particle powder;

[0039] Step 3. After step 2 finishes, add stainless steel grinding ball, iron powder and manganese powder (manganese powder accounts for 18% of the total powder quality of iron-manganese, the TaC particle of the coated nickel layer that step 3 obtains in ball mill jar again The powde...

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Abstract

The invention relates to an in-situ TaC particle and iron-based amorphous alloy synergistically strengthened medium-high manganese steel-based composite material and a preparation method thereof. Thepreparation method mainly comprises the following steps that tantalum (Ta) powder is mixed with carbon black or graphite (C) powder, after high-energy ball milling is carried out, Ta-C intermediate phase alloy powders with high reaction activity are obtained; coating nickel layers on the surfaces of intermediate phase alloy particles is carried out by utilizing high-energy ball milling; then ironpowders and manganese powders are added, high-energy ball milling is carried out, enabling part of the iron powders and manganese powders to reach nanoscale is carried out, high-pressure pressing is utilized to obtain a compact block blank; and the blank is put into a vacuum double-chamber heat treatment furnace to perform vacuum sintering, rapid air cooling is carried out after sintering is completed, and the finally needed composite material is obtained. According to the in-situ TaC particle and iron-based amorphous alloy synergistically strengthened medium-high manganese steel-based composite material and the preparation method thereof, the composite material shows ultrahigh elastic modulus, strength and hardness and good plasticity and toughness, the process is simple, scale is easy, and the composite material is suitable for developing products with long service life, such as gears, bearings, connecting rods, lining plates, rollers, cutters, molds and the like, under the working conditions of high temperature, high stress, hard abrasive wear and the like.

Description

technical field [0001] The invention relates to a steel-based metal composite material, in particular to a medium-high manganese steel-based composite material synergistically strengthened by in-situ TaC particles and an iron-based amorphous alloy and a preparation method thereof. Background technique [0002] In recent years, the study of amorphous alloy materials has become one of the research hotspots in the fields of ultra-high mechanical properties materials and soft magnetic materials. Although amorphous alloy material (also known as metallic glass) is a metastable material, it can only be transformed into a stable crystalline structure under certain conditions, so it can maintain its stable amorphous state for a long time. Compared with the crystalline phase of the same composition, amorphous alloys have more excellent mechanical properties (such as hardness, strength, wear resistance, corrosion resistance, and soft ferromagnetism, etc.), so their application potentia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/02C22C38/04C22C38/08C22C38/12C21D1/18C22C45/02
CPCC21D1/18C22C33/0292C22C38/04C22C38/08C22C38/12C22C45/02
Inventor 李海琴彭建洪李海宾毛多鹭杨永潇周德华许珂琳韩精卫
Owner QINGHAI UNIV FOR NATITIES
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