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Method for manufacturing defect-free clad layer at surface of cast iron

A cladding layer and defect-free technology, which is applied in the field of laser technology and coating preparation, can solve the problems of prolonging gas overflow time and affecting work efficiency, etc., and achieve the effect of solving pore defects, reducing scanning speed and excellent performance

Inactive Publication Date: 2017-08-15
GUANGXI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Improving cladding defects by adjusting process parameters can only prolong the gas overflow time, but cannot fundamentally solve the problem of pore defects, and also affect work efficiency
The present invention adopts the combination of laser remelting and laser cladding. By changing the element distribution on the surface of the substrate, the existence of free carbon is eliminated, and the generation of gas is fundamentally eliminated. There are no related reports and patents yet.

Method used

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  • Method for manufacturing defect-free clad layer at surface of cast iron
  • Method for manufacturing defect-free clad layer at surface of cast iron
  • Method for manufacturing defect-free clad layer at surface of cast iron

Examples

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Effect test

Embodiment 1

[0028] A method for preparing a defect-free cladding layer on a cast iron surface, comprising the following steps:

[0029] 1. Sample pretreatment; first wire cut the cast iron substrate into 45×35×10m 3 After removing the sample, grind it to 800# with sandpaper, ultrasonically clean it in acetone solution for 10 minutes, rinse it with deionized water, and dry the sample with a blower with cold air;

[0030] 2. Perform laser remelting treatment on the pretreated sample; the process parameters of laser remelting are: laser power P is 400W, scanning speed V is 30mm / min, spot diameter D is 2mm, overlapping rate M is 30%, The focal length H is 209mm, and the protective airflow L is 6L / min;

[0031] 3. Repeat step 2 for secondary laser remelting treatment;

[0032] 4. Select nickel-based alloy powder as the cladding material. The content of each component of the nickel-based alloy powder is as follows: Si content 1.8-3.0 Wt%, Cr content 0-6.0 Wt%, B content 0.8-1.2 Wt%, Fe conten...

Embodiment 2

[0036] A method for preparing a defect-free cladding layer on a cast iron surface, comprising the following steps:

[0037] 1. Sample pretreatment; first wire cut the cast iron substrate into 45×35×10m 3 After removing the sample, grind it to 800# with sandpaper, ultrasonically clean it in acetone solution for 10 minutes, rinse it with deionized water, and dry the sample with a blower with cold air;

[0038] 2. Perform laser remelting on the pretreated sample; the process parameters of laser remelting are: laser power P is 1000W, scanning speed V is 400mm / min, spot diameter D is 3mm, overlap rate is 40%, focal length H is 200mm, and the protective airflow L is 15L / min;

[0039] 3. Repeat step 2 for secondary laser remelting treatment;

[0040] 4. Select iron-based alloy powder as the cladding material. The content of each component of the iron-based alloy powder is as follows: Si content 2.5-7.5%, Cr content 3-6%, B content 1.3-2.0%, C content 0.15-0.75% , the Ni content is...

Embodiment 3

[0044] A method for preparing a defect-free cladding layer on a cast iron surface, comprising the following steps:

[0045] 1. Sample pretreatment; first wire cut the cast iron substrate into 45×35×10m 3 After removing the sample, grind it to 1500# with sandpaper, ultrasonically clean it in acetone solution for 15 minutes, rinse it with deionized water, and dry the sample with a blower with cold air;

[0046]2. Perform laser remelting on the pretreated sample; the process parameters of laser remelting are: laser power P is 1600W, scanning speed V is 240mm / min, spot diameter D is 2mm, overlapping rate is 50%, focal length H is 209mm, and the protective airflow L is 15L / min;

[0047] 3. Repeat step 2 for secondary laser remelting treatment;

[0048] 4. Select cobalt-based alloy powder as the cladding material. The content of each component of the cobalt-based alloy powder is as follows: Si content 0.2-0.4 Wt%, Cr content 4-12Wt%, B content 0.8-1.2 Wt%, Fe content 0- 1 Wt%, O ...

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Abstract

The invention discloses a method for manufacturing a defect-free clad layer at the surface of cast iron. The method comprises the following steps: after pretreating a cast iron base material, firstly performing surface pretreatment on the surface of the base material by adopting laser remelting; regulating chemical ingredients of the surface of the base material without changing the overall performance of the base material; and subsequently performing laser cladding to make sure that the laser-remelted base material surface and the cladding material are simultaneously molten and are quickly solidified to form the clad layer. The clad layer manufactured by the method disclosed by the invention is free of the defects of air holes and cracks, so the problem about liable occurrence of defects of air holes and cracks caused by high carbon content of a cast iron part in a laser cladding process can be fundamentally solved.

Description

technical field [0001] The invention relates to the technical fields of laser technology and coating preparation, in particular to a method for preparing a defect-free cladding layer on the surface of cast iron by adopting a process combining laser remelting and laser cladding. Background technique [0002] Cast iron has a series of advantages such as better castability, wear resistance, shock absorption, machinability and low notch sensitivity than steel, and is most widely used in industry. [0003] However, during the service process, the workpiece is often scrapped due to defects such as local friction, corrosion, and oxidation. Laser cladding has become an important process for remanufacturing due to its excellent performance. However, during the cladding process, due to the difference in physical properties between the cladding material and the substrate and the properties of the substrate, there are often pores and crack defects, such as attached Figure 5 As shown, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/103
Inventor 李伟洲蒋智秋陈泉志童庆黄祖江钱堃董婉冰
Owner GUANGXI UNIV
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