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Intermetallic compound and carbonitride co-hardened powder metallurgy high-speed steel and preparation method thereof

A technology of intermetallic compounds and carbonitrides, applied in the field of machining tools, can solve the problems of excessive grain size, hindering grain growth, low hardness and wear resistance, etc.

Active Publication Date: 2020-10-20
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the traditional powder metallurgy preparation of intermetallic compound hardened high-speed steel, there are still shortcomings such as excessively large grains after sintering because no carbide hinders grain growth. At the same time, the microhardness of intermetallic compounds is 1400HV, which is still low. For most carbides, the hardness and wear resistance at lower temperatures are still lower than those of traditional carbide hardened high-speed steels

Method used

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  • Intermetallic compound and carbonitride co-hardened powder metallurgy high-speed steel and preparation method thereof
  • Intermetallic compound and carbonitride co-hardened powder metallurgy high-speed steel and preparation method thereof
  • Intermetallic compound and carbonitride co-hardened powder metallurgy high-speed steel and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0040] The mass fractions are: Co: 25%, Mo: 12%, W: 4%, TiC: 2%, Ti(C, N): 2%, the balance is Fe, and the powder is prepared. Mix the prepared raw material powder, 4wt% forming agent paraffin, and 0.5wt% carbon black, and place them in a planetary ball mill ball mill tank for wet ball milling. During the ball milling process, the ball milling medium is alcohol, the protective gas is nitrogen, and the ball-to-battery ratio is 5: 1. The speed is 260r / min, and the ball milling time is 48h. After the ball milling is completed, it is dried in a vacuum drying oven, dried and sieved to granulate, and the mixed powder is subjected to unidirectional molding under a pressure of 180 MPa to obtain a compact. The compact is placed in a vacuum sintering furnace for sintering, the final sintering temperature is 1340°C, the highest temperature stage is kept for 2 hours, and the sintered compact is obtained after cooling with the furnace. The sintered billet was preheated at 1120°C in a nitrog...

Embodiment 2

[0042] The mass fractions are: Co: 20%, Mo: 11%, W: 5%, TiN: 4%, Ti(C, N): 4%, the balance is Fe, and the powder is prepared. Mix the prepared raw material powder, 3wt% forming agent paraffin, and 0.6wt% carbon black, and place them in the ball mill tank of a planetary ball mill for wet ball milling. During the ball milling process, the milling medium is alcohol, the protective gas is nitrogen, and the ball-to-battery ratio is 6: 1. The rotating speed is 240r / min, and the ball milling time is 50h. After the ball milling is completed, it is dried in a vacuum drying box, dried and sieved to granulate, and the mixed powder is subjected to unidirectional molding under a pressure of 160 MPa to obtain a compact. The compact is placed in a vacuum sintering furnace for sintering, the final sintering temperature is 1370°C, the highest temperature stage is kept for 2 hours, and the sintered compact is obtained after cooling with the furnace. The sintered billet was preheated at 1130°C i...

Embodiment 3

[0044] The mass fractions are: Co: 20%, Mo: 15%, W: 5%, NbC: 8%, the balance is Fe, and the powder is prepared. Mix the prepared raw material powder, 3wt% forming agent paraffin, and 0.6wt% carbon black, and place them in the ball mill tank of a planetary ball mill for wet ball milling. During the ball milling process, the milling medium is alcohol, the protective gas is nitrogen, and the ball-to-battery ratio is 6: 1. The speed is 220r / min, and the ball milling time is 60h. After the ball milling is completed, it is dried in a vacuum drying oven, dried and sieved to granulate, and the mixed powder is subjected to unidirectional molding under a pressure of 180 MPa to obtain a compact. The compact is placed in a vacuum sintering furnace for sintering, the final sintering temperature is 1340°C, the highest temperature stage is kept for 2 hours, and the sintered compact is obtained after cooling with the furnace. The sintered billet was preheated at 1130°C in a nitrogen-protected...

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Abstract

The invention discloses intermetallic compound and carbonitride co-hardened powder metallurgy high-speed steel, which is prepared by the following steps: strengthening a steel matrix by using an intermetallic compound generated in situ and additional carbonitride, and obtaining the intermetallic compound and carbide co-hardened powder metallurgy high-speed steel by a powder metallurgy method. Theintermetallic compound and carbonitride co-hardened powder metallurgy high-speed steel is obtained by adding specific stable carbonitride and alloy elements and co-strengthening the material by addingthe carbonitride and the in-situ generated intermetallic compound. Due to less carbon in the intermetallic compound and the matrix, the material can keep excellent red hardness and knife sticking resistance, and meanwhile, the addition of the stable high-hardness carbonitride can achieve the effects of obviously refining grains and improving the wear resistance.

Description

Technical field [0001] The invention relates to the field of machining tools, in particular to a powder metallurgy high-speed steel that is strongly hardened by intermetallic compounds and carbonitrides. The high-speed steel material is especially suitable for processing materials such as titanium alloys and high-temperature alloys. Background technique [0002] High-speed steel was successfully developed in the 1890s. In the past 100 years, with the rapid development of industrial technology, the requirements for material processing have become higher and higher. Traditional cast-forged high-speed steel cannot meet the needs of processing. The types and preparation methods of steel are constantly updated. Among them, titanium alloys, superalloys, and stainless steel materials have a wide range of applications in various fields, and can be used in aerospace technology, military equipment, biomedicine, marine engineering, energy and power, automobile manufacturing and other indust...

Claims

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Application Information

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IPC IPC(8): C22C33/02C22C38/10C22C38/12C21D6/04
CPCC22C33/0285C22C38/10C22C38/12C22C33/006C21D6/007C21D6/04
Inventor 康希越袁紫仁谢丰伟贺跃辉
Owner CENT SOUTH UNIV
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