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Reinforced ni-based wear-resistant laser cladding coating using nb element and preparation method thereof

A laser cladding and elemental technology, which is applied in coating, metal material coating process, etc., can solve the problems of mold steel surface wear and other problems, and achieve the effect of no pollution, simple preparation process and compact structure

Active Publication Date: 2019-10-29
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved in the present invention is: aiming at the shortcomings of existing laser cladding and the wear and failure mechanism of automobile extrusion dies, a kind of Nb element-enhanced Ni-based wear-resistant laser cladding coating and its preparation method are proposed to solve the problem of automobile extrusion die wear failure mechanism. Die steel surface wear problem

Method used

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  • Reinforced ni-based wear-resistant laser cladding coating using nb element and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: The laser power is 1800W, and the amount of pure Nb powder added is 4.5% of the mass of the nickel-based alloy composite powder.

[0024] (1) Cr12MoV steel substrate pretreatment

[0025] The surface of the processed automobile die steel Cr12MoV steel substrate was polished with sandpaper and cleaned with acetone to obtain a smooth and clean surface.

[0026] (2) Laser cladding

[0027] The composition and mass fraction of the nickel-based alloy powder used to prepare the coating are: 0.73%C, 4.05%B, 4.66%Si, 0.58%Ce, 0.18%Mg, 19.04%Cr, 0.53%K, 2.47%Fe, Ni Quantity; the particle size range of nickel-based alloy powder is 75-150μm; add pure Nb powder and pure Ta powder with a particle size of 35-45μm to the nickel-based alloy powder, and the addition amount of pure Nb powder and pure Ta powder is nickel-based alloy powder 4.5% and 1.5% of the mass of the composite powder; the mixed powder was mechanically mixed with a planetary ball mill for 3 hours, and aft...

Embodiment 2

[0030] Example 2: The laser power is 1800W, and the amount of pure Nb powder added is 3.0% of the mass of the nickel-based alloy composite powder.

[0031] (1) Cr12MoV steel substrate pretreatment

[0032] The surface of the processed automobile die steel Cr12MoV steel substrate was polished with sandpaper and cleaned with acetone to obtain a smooth and clean surface.

[0033] (2) Laser cladding

[0034]The composition and mass fraction of the nickel-based alloy powder used to prepare the coating are: 0.97%C, 3.24%B, 5.10%Si, 0.37%Ce, 0.27%Mg, 18.26%Cr, 0.69%K, 4.64%Fe, Ni Quantity; the particle size range of nickel-based alloy powder is 75-150μm; add pure Nb powder and pure Ta powder with a particle size of 35-45μm to the nickel-based alloy powder, and the addition amount of pure Nb powder and pure Ta powder is nickel-based alloy powder 3.0% and 2.0% of the mass of the composite powder; the mixed powder was mechanically mixed with a planetary ball mill for 3 hours, and then...

Embodiment 3

[0036] Example 3: The laser power is 1800W, and the amount of pure Nb powder added is 3.8% of the mass of the nickel-based alloy composite powder.

[0037] (1) Cr12MoV steel substrate pretreatment

[0038] The surface of the processed automobile die steel Cr12MoV steel substrate was polished with sandpaper and cleaned with acetone to obtain a smooth and clean surface.

[0039] (2) Laser cladding

[0040] The composition and mass fraction of the nickel-based alloy powder used to prepare the coating are: 0.79%C, 3.50%B, 4.87%Si, 0.43%Ce, 0.23%Mg, 18.71%Cr, 0.62%K, 3.84%Fe, Ni Quantity; the particle size range of nickel-based alloy powder is 75-150μm; add pure Nb powder and pure Ta powder with a particle size of 35-45μm to the nickel-based alloy powder, and the addition amount of pure Nb powder and pure Ta powder is nickel-based alloy powder 3.8% and 1.7% of the mass of the composite powder; the mixed powder was mechanically mixed with a planetary ball mill for 3 hours, and aft...

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Abstract

The invention discloses a Nb element-reinforced Ni base wear-resistance laser cladding coating layer and a preparation method thereof, and relates to the technical field of laser cladding. A proper amount of pure Nb powder is added in a coating layer; and the added Nb is combined with C in a molten pool for in-situ generation of high-hardness and high-stability NbC hard-phase particles to improvethe mechanical performances of a Ni base coating layer. The coating layer is prepared by the following steps: firstly, a mold steel basal body is pretreated; and alloy powder is matched according to designed components, and is mixed by a planet ball mill for drying as a cladding material. The laser cladding mode of synchronous powder feeding is adopted to prepare the cladding layer on the surfaceof the mold steel basal body. The obtained cladding layer is compact in structure, free of such defects as air holes, cracks and inclusions and excellent in metallurgical bonding with the basal body;the surface performances of the mold steel are prominently improved; and the mold service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of laser cladding, in particular to a Ni-based wear-resistant laser cladding coating reinforced with Nb element and a preparation method thereof. Background technique [0002] In the field of automobile industry, more than 90% of auto parts are formed by molds, and molds are becoming more and more important in automobile manufacturing, so they are called "the mother of the automobile industry". However, during the service process of the mold, due to the wear and corrosion of the mold surface, the mold fails early, which greatly shortens the service life of the mold, which not only affects the production cycle and production cost of the product, but also causes a waste of resources to a certain extent. If the surface repair method is used to prepare a layer of high-strength and high-hardness coating on the surface of the failed mold, it can not only put the failed mold back into use, reduce production costs a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C22C19/05
CPCC22C19/058C23C24/106
Inventor 平学龙符寒光孙淑婷
Owner BEIJING UNIV OF TECH
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