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A kind of composite phase coating on low carbon steel surface and preparation method thereof

A low-carbon steel and coating technology, which is applied in the microstructure and preparation of multiphase coatings containing martensite and retained austenite, and in the field of multiphase coatings on low-carbon steel surfaces and their preparation, which can solve the problems of coating and The bonding strength of the matrix is ​​not good enough, the surface coating is easy to fall off, etc., to achieve the effects of optimized composition design, low alloying cost, and expanded application range

Active Publication Date: 2020-06-16
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the above patents disclose some methods for improving the hardness and wear resistance on the surface of low carbon steel, the bonding strength between the coating and the substrate is not good enough, and there are many defects in the interface, and the surface coating is easy to fall off, which has not been fundamentally solved. Problems with surface properties of low carbon steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In the first step, combine the following components:

[0033] C: 0.12%; Si: 2.0%; Mn: 1.7%; Cr: 2.5%; Al: 2.3%; Nb: 0.033%; Graphene: 0.05%; P: 0.006%;

[0034] After mixing in proportion, carry out ball milling, the rotating speed is 220r / min, and the ball milling time is 1.5h;

[0035] In the second step, the ball-milled powder is subjected to induction cladding, using water glass as a binder, and the previously mixed alloy powder is evenly coated on the surface of the low-carbon steel substrate to obtain a prefabricated coating with a thickness of 1.3mm. Floor. Then place the prefabricated coating in a blast oven at 200°C for 1.6 hours to keep the adhesive fully volatilized. After drying, put it in the induction cladding equipment, and carry out induction cladding at a temperature of 1000°C, with a cladding current of 260A, a cladding time of 50s, and an oscillation frequency of 30KHz; finally an ideal cladding coating is obtained.

[0036] In the third step, the ...

Embodiment 2

[0043] In the first step, combine the following components:

[0044] C: 0.15%; Si: 1.9%; Mn: 2.8%; Cr: 2.9%; Al: 1.5%; Nb: 0.041%; Graphene: 0.1%; P: 0.007%;

[0045] After mixing in proportion, carry out ball milling, the rotating speed is 240r / min, and the ball milling time is 2h;

[0046] The second step is to perform induction cladding on the ball-milled powder, using water glass as the binder, and uniformly coat the previously mixed alloy powder on the surface of the low-carbon steel substrate to obtain a prefabricated steel sheet with a thickness of about 1.7mm. coating. Then place the prefabricated coating in a blast oven at 180°C for 1.7 hours to keep the adhesive fully volatilized. After drying, place it in induction cladding equipment, conduct induction cladding at a temperature of 1100°C, cladding current of 300A, cladding time of 40s, oscillation frequency of 50KHz, and finally obtain an ideal cladding coating.

[0047]In the third step, the steel is heated to a...

Embodiment 3

[0054] In the first step, combine the following components:

[0055] C: 0.23%; Si: 1.6%; Mn: 2.1%; Cr: 3.2%; Al: 1.2%; Nb: 0.050%; Graphene: 0.2%; P: 0.009%;

[0056] After mixing in proportion, carry out ball milling, the rotating speed is 260r / min, and the ball milling time is 2.5h;

[0057] The second step is to perform induction cladding on the ball-milled powder, using water glass as the binder, and uniformly coat the previously mixed alloy powder on the surface of the low-carbon steel substrate to obtain a prefabricated steel sheet with a thickness of about 1.9mm. coating. Then place the prefabricated coating in a blast oven at 130°C for 2 hours to keep the adhesive fully volatilized. After drying, place it in induction cladding equipment, conduct induction cladding at a temperature of 1200°C, cladding current is 320A, cladding time is 55s, oscillation frequency is 60KHz, and finally an ideal cladding coating is obtained.

[0058] In the third step, the steel is heate...

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Abstract

The invention discloses a low-carbon steel surface complex-phase coating and a preparation method thereof. The low-carbon steel surface complex-phase coating is prepared from the following components:0.11 to 0.25 percent of C, 1.5 to 2.3 percent of Si, 1.7 to 2.9 percent of Mn, 1.9 to 3.2 percent of Cr, 1.2 to 2.6 percent of Al, 0.021 to 0.053 percent of Nb, 0.05 to 0.2 percent of Graphene, lessthan or equal to 0.01 percent of P, less than or equal to 0.01 percent of S and the balance of Fe. The preparation method comprises the following steps: firstly, preparing a coating raw material by utilizing a ball milling method and carrying out induction melting on a carbon steel surface; then carrying out carburizing treatment; and then carrying out annealing and carbon distribution treatment to obtain the complex-phase coating containing nano bainite, martensite and residual austenite structures. According to the low-carbon steel surface complex-phase coating, the Graphene is added and a component design is optimized, so that the rigidity and wear resistance of the steel surface are greatly improved and application of low-carbon steel is expanded.

Description

technical field [0001] The invention relates to a low-carbon steel surface multiphase coating and a preparation method thereof, in particular to a multiphase coating structure containing martensite and retained austenite and a preparation method thereof, belonging to the field of metal material surface treatment. Background technique [0002] With the rapid development of modern industrial technology, a large number of steel materials are used in some special environments, which has higher requirements for the strength and service life of materials. The traditional method of improving the strength and other properties of steel materials is mainly achieved by increasing the alloying level, but high alloying will consume a large amount of rare metal resources, and its production process is complex and requires heat treatment, and there are also high energy consumption and environmental pollution. A series of problems such as serious, high material cost and difficulty in recycl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C23C8/00C21D1/18C23F17/00C22C38/38C22C38/34C22C38/06C22C38/26
CPCC21D1/18C21D2211/001C21D2211/002C21D2211/008C22C38/06C22C38/26C22C38/34C22C38/38C23C8/00C23C24/103C23F17/00
Inventor 刘和平孙凤儿高一波程少磊刘斌裴畅贵贾晓帅
Owner ZHONGBEI UNIV
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