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Nanometer M2B reinforced iron-based wear-resistant coating and preparation method thereof

A wear-resistant coating and nanotechnology, which is applied in the field of nano-M2B reinforced iron-based wear-resistant coating and its preparation, can solve the problems of affecting wear resistance, cracking and crushing, cracking failure on the surface of parts, etc., so as to improve wear resistance. , Excellent wear resistance, solve the effect of easy peeling

Active Publication Date: 2021-06-18
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the hard phase M 2 B has a continuous network structure, which is prone to cracking and fragmentation during wear and service, which not only seriously affects its wear resistance, but also causes rapid cracking and failure on the surface of parts

Method used

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  • Nanometer M2B reinforced iron-based wear-resistant coating and preparation method thereof
  • Nanometer M2B reinforced iron-based wear-resistant coating and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0032] A kind of nano M of the present invention 2 B strengthens the preparation method of iron-based wear-resistant coating, comprises the following steps:

[0033] S1, material selection;

[0034] The cast Fe-B alloy is selected as the raw material, and the surface of the alloy is polished to remove rust.

[0035] The boride content in the Fe-B alloy ranges from 10% to 40%.

[0036] S2, preprocessing

[0037] Place the processed alloy block in an argon gas protection chamber for preheating.

[0038] The alloy test block is preheated, and the preheating temperature is 150-500°C.

[0039] S3, laser melting

[0040] Use laser to melt the surface of cast Fe-B alloy;

[0041] The laser power is 0.5-2kW, and the scanning speed is 0.1-1m / min.

[0042] S4, heat treatment

[0043] The sample after surface melting treatment is subjected to quenching + tempering heat treatment to obtain nanometer M 2 B enhanced martensite matrix wear-resistant coating.

[0044] The quenching ...

Embodiment 1

[0051] The cast Fe-B alloy is used as the raw material, and the volume fraction of boride is 10%. The surface of the alloy is polished and rust-removed. The treated alloy sample is placed in an argon gas protection chamber, and the alloy is heat-treated. The heat temperature is 150°C. The alloy is melted by a laser, the laser power is 0.5kw, and the scanning speed is 0.1m / min. The processed sample is subjected to quenching+tempering heat treatment: the quenching temperature is 1050°C, the heating rate is 20°C / min, after 2 hours of heat preservation, it is cooled in engine oil for 5 minutes; the tempering temperature is 350°C, and the heating rate is 5°C / min , keep warm for 4h, and cool down with the furnace.

[0052] Nano-M prepared in this experiment 2 B reinforced iron-based wear-resistant coating, hard phase M 2 The size of B is 40nm, the hardness is 59.0HRC, and the wear resistance against impact abrasive wear is 3.7 times that of Fe-B alloy.

Embodiment 2

[0054] The cast Fe-B alloy is used as the raw material, and the boride volume fraction is 26%. The surface of the alloy is polished and rust-removed. The treated alloy sample is placed in an argon gas protection chamber, and the alloy is heat-treated. The heating temperature is 250°C. The alloy is melted with a laser, the laser power is 1.0kw, and the scanning speed is 0.5m / min. The treated sample is subjected to quenching + tempering heat treatment: the quenching temperature is 950°C, the heating rate is 15°C / min, after holding for 3 hours, it is cooled in engine oil for 5 minutes; the tempering temperature is 300°C, and the heating rate is 8°C / min , keep warm for 3.5h, and cool with the furnace.

[0055] Nano-M prepared in this experiment 2 B reinforced iron-based wear-resistant coating, hard phase M 2 The size of B is 356nm, the hardness is 61.5HRC, and the wear resistance against impact abrasive wear is 4.6 times that of Fe-B alloy.

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Abstract

The invention discloses a nanometer M2B reinforced iron-based wear-resistant coating and a preparation method thereof. The method comprises the following steps of selecting cast Fe-B alloy as an original matrix, and polishing and derusting the surface of the original matrix; placing the treated original matrix in argon for preheating treatment; conducting surface melting treatment on the pretreated original matrix by utilizing high-energy laser; and conducting quenching and tempering heat treatment on the original matrix subjected to surface melting treatment, and preparing the surface wear-resistant coating of the nanometer M2B enhanced martensitic matrix on the surface of the original matrix. The prepared nanometer M2B reinforced iron-based wear-resistant coating has excellent wear resistance and can be used for the working condition of impact abrasive wear resistance, the wear resistance of the coating is improved by 3-7 times compared with the wear resistance of a cast Fe-B alloy, the traditional Fe-B wear-resistant alloy can be applied to the working condition of impact wear after being subjected to proper laser surface melting to prepare the coating, and the coating has important engineering application and popularization value.

Description

technical field [0001] The invention belongs to the technical field of iron-based wear-resistant materials, in particular to a nanometer M 2 B reinforced iron-based wear-resistant coating and its preparation method. Background technique [0002] Steel is one of the most widely used materials and is an important structural material. Iron and steel wear-resistant casting alloys are widely used in metallurgy, mining, electric power and other industrial fields. Their wear resistance and service safety are the key factors affecting the service life of parts. The failure of metal materials caused by wear and tear in my country is as high as 3 million tons every year, and the direct economic loss exceeds 100 billion yuan, and this loss is still rising. Preparation of low-cost cast Fe-B wear-resistant alloys made of high-hardness M 2 Composed of B (M refers to Fe and alloying elements) and a metal matrix, it can be used in wear conditions with no impact or low impact. However, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/09C21D6/00
CPCC21D1/09C21D6/00C21D2211/008Y02P10/25
Inventor 皇志富宁海玥坚永鑫孔寒冰
Owner XI AN JIAOTONG UNIV
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