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Preparation method of high-entropy cladding coating for improving surface strength and toughness of die steel

A technology of surface strength and die steel, applied in the direction of coating, energy efficiency improvement, solid-state diffusion coating, etc., can solve problems such as short service life, surface hardness and toughness can not meet the requirements at the same time, limited use conditions, etc., to achieve reduction Production cost, improvement of surface strength and corrosion resistance, effect of improvement of friction resistance

Inactive Publication Date: 2020-03-27
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention overcomes the deficiencies of the prior art, and proposes a method for preparing a high-entropy cladding coating that improves the surface strength and toughness of die steel. The purpose is to improve the surface strength and hardness of die steel, increase the overall toughness of die steel, and solve the current problem Due to the fact that the surface hardness and toughness of die steel cannot meet the requirements at the same time, the service life is short and the use conditions are limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) First cut the mold steel into a metal cylinder with radius r=10mm and height h=10mm. Use 600-2100 mesh corundum gauze to pretreat one side of the mold steel, and then use a 98% alcohol solution to ultrasonically clean the mold steel. Then content is 1.28% WC, 2.9% Cr, 0.3% graphene, all the other are the mixed powder of mold steel and carry out dry method ball milling, and the mode of ball milling is dry method ball milling, and rotating speed is 250r / min, and the time of ball milling is 1.5h.

[0036]2) Use a mixture of rosin and turpentine at a ratio of 1:3 as a binder, mix it with the powder obtained after ball milling, and coat it uniformly on the surface of the mold steel with a thickness of 2.4 mm; The mold steel is kept in a blast drying oven at 110°C for 7.5 hours to fully volatilize the binder.

[0037] 3) Put the dried mold steel in the induction cladding machine, the heating temperature is 1450°C, and the heating time is 10s, so that the mixed powder on ...

Embodiment 2

[0042] 1) First cut the mold steel into a metal cylinder with radius r=10mm and height h=10mm. Use 600-2100 mesh corundum gauze to pretreat one side of the mold steel, and then use a 98% alcohol solution to ultrasonically clean the mold steel. Then the WC that content is 1.30%, the Cr of 3.9%, the graphene of 0.5%, all the other are the mixed powder of mold steel and carry out dry method ball milling, and the mode of ball milling is dry method ball milling, and rotating speed is 240r / min, and the time of ball milling is 1.6h.

[0043] 2) Use a mixture of rosin and turpentine at a ratio of 1:3 as a binder, mix it with the powder obtained after ball milling above, and then evenly coat it on the surface of the mold steel with a coating thickness of 2.5 mm; The mold steel is kept in a blast drying oven at 113°C for 7.9 hours to fully volatilize the binder.

[0044] 3) Put the dried mold steel in the induction cladding machine, the heating temperature is 1470°C, and the heating t...

Embodiment 3

[0049] 1) First cut the mold steel into a metal cylinder with radius r=10mm and height h=10mm. Use 600-2100 mesh corundum gauze to pretreat one side of the mold steel, and then use a 98% alcohol solution to ultrasonically clean the mold steel. Then the WC that content is 1.36%, the Cr of 3.7%, the graphene of 0.4%, all the other are the mixed powder of mold steel and carry out dry ball milling, and the mode of ball milling is dry ball milling, and rotating speed is 200r / min, and the time of ball milling is 1.9h.

[0050] 2) Use a mixture of rosin and turpentine at a ratio of 1:3 as a binder, mix it with the powder obtained after ball milling above, and coat it uniformly on the surface of the mold steel with a thickness of 2.0 mm; The die steel is kept in a blast drying oven at 118°C for 7.7 hours to fully volatilize the binder.

[0051] 3) Put the dried mold steel in the induction cladding machine, the heating temperature is 1480°C, and the heating time is 20s, so that the m...

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Abstract

The invention discloses a preparation method of a high-entropy cladding coating for improving the surface strength and toughness of die steel, and belongs to the technical field of die materials. Theproblems that existing die steel is short in service life and limited in use condition due to the fact that the surface hardness and toughness cannot meet the requirements at the same time are solved.Specifically, a material composed of WC, Cr, graphene and die steel powder in a certain mass ratio is adopted, and induction cladding, vacuum heating, surface quenching, low-temperature tempering andnitriding treatment are sequentially carried out to obtain a die steel coating. According to the method, a mode of combining induction cladding and special heat treatment is utilized, the structure of each part of the die steel is idealized in the heat treatment process, a formed cladding layer is tempered martensite, the core of the die steel is a sorbite structure, the surface strength and hardness of the die steel are improved, the overall toughness of the die steel is improved, the service life of the die steel is prolonged, and the use conditions of the die steel are improved.

Description

technical field [0001] The invention belongs to the technical field of mold materials, in particular to a method for preparing a high-entropy cladding coating for improving the surface strength and toughness of mold steel. Background technique [0002] As we all know, the quality of the mold directly affects the quality of the pressure processing process, the precision output of the product and the production cost, and the quality and service life of the mold are mainly affected by the mold material and heat treatment in addition to the reasonable structural design and processing accuracy. Among them, the steel used for cold working dies should have high hardness, strength, wear resistance, sufficient toughness, high hardenability, hardenability and other process properties according to the working conditions of the manufactured tools. However, in the actual operation process, mold steel often has defects such as fracture, deformation, and wear, which cause the workpiece and...

Claims

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Application Information

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IPC IPC(8): C23C24/10C21D1/74C21D1/26C21D1/10C23C8/26
CPCC23C24/103C21D1/74C21D1/26C21D1/10C23C8/26C21D2211/008C21D2211/009Y02P10/25
Inventor 刘和平刘浪浪杨恒喆程少磊孙凤儿裴畅贵荆兴斌
Owner ZHONGBEI UNIV
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