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Method for laser cladding Ni-based alloy+B4C wild phase on Q550 steel

A technology of laser cladding and base alloy, which is applied to the laser strengthening of high-strength steel surface, laser cladding Ni-base alloy powder + boron carbide reinforcement phase, which can solve the problem of insufficient bonding between the reinforcement phase and the base alloy, and crack pores in the cladding layer The increase of defect rate and the increase of cladding layer dilution rate have achieved the effects of reducing powder loss, increasing production costs, increasing service life of workpieces, and increasing wear resistance

Inactive Publication Date: 2014-07-16
SHANDONG UNIV
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] In recent years, with the increasing industrial application of high-power lasers, the laser cladding technology has experienced problems such as an increase in the dilution rate of the cladding layer, a serious impact on the substrate by heat, and an increase in the cladding layer crack and pore defect rate.
The existing process of adding reinforcement phase to laser cladding can only be used for one type of workpiece, for example, only for shaft parts, small-size workpieces or large-size workpieces, and there is no process with wide applicability; the reinforcement phase and matrix alloy The combination is not strong enough, and there are problems such as cracks, pores, and slag inclusions in the structure; the existing laser cladding process requires external gas protection, which has high costs and low production efficiency
During the processing of Q550 high-strength steel manufactured by controlled rolling and controlled cooling technology (TMCP), the base metal structure is sensitive to heat input, and under the condition of large heat input, it is easy to produce temper softening zone and cause the base metal to lose strength.

Method used

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  • Method for laser cladding Ni-based alloy+B4C wild phase on Q550 steel
  • Method for laser cladding Ni-based alloy+B4C wild phase on Q550 steel

Examples

Experimental program
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Effect test

Embodiment 1

[0028] On a Q550 high-strength steel sample with a size of 10mm×10mm×25mm, laser cladding Ni-based alloy powder plus B 4 C enhanced phase.

[0029] The specific process steps are as follows:

[0030] 1) Grinding the surface of the Q550 steel sample to remove oil and rust;

[0031] 2) The Ni-based powder for cladding is Ni60 series self-fluxing alloy, the particle size is 250 mesh, the mass percentage of each component of Ni60 alloy powder: C0.85%, Si0.45%, B3.6%, Cr16%, Fe14% , and the rest are Ni. B 4 The C reinforcement phase has a purity of 99% and a particle size of 200 mesh. B 4 Add 5% of C reinforcement layer powder by mass fraction, the total amount of mixed powder is 100g, take 95g of Ni60 alloy powder and 5g of B 4 C powder was uniformly mixed in a powder mixer for 2 hours, then dried at 250°C for 30 minutes, and put into a powder feeder for use.

[0032] 3) Fix the sample on the workbench, perform laser cladding on the sample area of ​​10mm×25mm, use the intel...

Embodiment 2

[0039] On a Q550 high-strength steel sample with a size of 10mm×20mm×30mm, laser cladding Ni-based alloy powder+B 4 C strengthening phase.

[0040] The specific process steps are as follows:

[0041] 1) Grinding the surface of Q550 steel sample 20×30mm before laser cladding to remove oil and rust;

[0042] 2) The Ni-based powder for cladding is Ni60 series self-fluxing alloy, the particle size is 250 mesh, the mass percentage of each component of Ni60 alloy powder: C0.85%, Si0.45%, B3.6%, Cr16%, Fe14% , and the rest are Ni. B 4 The C reinforcement phase has a purity of 99% and a particle size of 200 mesh. B 4 C reinforcement phase powder is added by 8% by mass fraction, and the total amount of mixed powder is 200g. Get 184g Ni60 alloy powder and 16g B 4 C powder was uniformly mixed in a powder mixer for 2 hours, then dried at 250°C for 30 minutes, and put into a powder feeder for use.

[0043] 3) Fix the sample on the workbench, perform laser cladding on the sample are...

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Abstract

The invention discloses a method for laser cladding Ni-based alloy+B4C wild phase on Q550 steel. The method comprises the following steps: grinding the surface of Q550 steel to remove greasy dirt and rust; cladding an enhancement layer on the surface of Q550 steel by using an optical fiber laser, wherein the technical parameters are as follows: the power is 2.0-4.0Kw, the cladding speed is 10-50cm / min, the laser heat source pattern can be circular spot with diameter being 5mm or rectangular spot with specification of 1.5mm*17mm; laser cladding the surface in forms of circular and rectangular spots, wherein the powder feeding rates are respectively 20-100g / min and 30-150g / min; and removing slag from the surface of the cladding layer, cooling to room temperature and processing chemically. The method disclosed by the invention realizes firm metallurgical combination of the Q550 steel and wild phase alloy powder, so that the method is high in production efficiency and convenient and agile to operate. The obtained cladding layer has fine texture, is free of cracks, pores and slag and also has excellent performance.

Description

technical field [0001] The invention belongs to the technical field of laser cladding, and relates to a laser strengthening method for the surface of high-strength steel, in particular to a method for laser cladding Ni-based alloy powder + boron carbide (B) on Q550 high-strength steel. 4 C) Reinforcement phase method. Background technique [0002] In recent years, with the rapid development of high-power lasers in industrial applications, laser cladding technology has been widely used, and the surface modification of metal materials has attracted more and more attention. The use of laser cladding technology to carry out wear-resistant, corrosion-resistant, high-temperature-resistant and other enhanced processing on the surface of the profile not only improves the service life of parts, but also saves energy and material loss. It can be used in the production and repair of modern industrial equipment. obtain huge economic benefits. For example, laser cladding technology is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C32/00C22C19/05
Inventor 李亚江马群双王娟
Owner SHANDONG UNIV
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