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Surface laser-clad Ni-based alloy

A nickel-based alloy and laser cladding technology, applied in the field of surface coating materials, can solve problems such as expensive imported components and Monel alloys that cannot fully meet service requirements

Inactive Publication Date: 2018-06-08
林艳红
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, due to reasons such as preparation technology in China, the Monel alloy produced cannot fully meet the service requirements of specific occasions, and imported components are expensive, such as 8 # The import price of integral Monel alloy plug valve is as high as 3×104 US dollars

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0015] The raw materials for the preparation of surface laser cladding nickel-based alloys include: the base material is Monel400 alloy, and its chemical composition (mass fraction, %) is C0.3, Si0.5, Fe2.0, Mn1.5, Cu34.0, Ni is margin. The sample size is 140mm×60mm×10mm. The laser cladding material is a self-prepared nickel-based alloy powder with an average particle size of 90 μm and industrial purity. The substrate sample is polished by No. 600 SiC metallographic sandpaper, and then cleaned and dried. The preparation steps of the surface laser cladding nickel-based alloy are as follows: first, a thin layer of thermal barrier coating is prepared on the surface of the Monel alloy, and then laser cladding treatment is performed. The laser cladding material is prepared into a paste with a binder and evenly preset on the surface of the pretreated substrate sample. The thickness of the preset alloy powder is 1.2mm. After natural drying, it is dried at 120 ° C for 2 hours. Using...

Embodiment example 2

[0017] The structure of the modified layer is uniform and dense, without defects such as pores and cracks. The laser cladding layer consists of three areas: cladding zone, bonding zone and heat-affected zone, and the alloying zone presents a bright white band parallel to the interface. The microstructure of the cladding layer is fine dendrites, the distance between dendrites is less than 4 μm, there is a small amount of eutectic structure between dendrites, and a large number of massive primary phases appear inside the modified layer. Energy spectrum analysis showed that the contents of nickel and chromium (atomic fraction, %) in the dendrites were 31.92 and 42.41, respectively, and the interdendritic regions were rich in Cr and C elements. It shows that the dendrite region is mainly composed of γ-Ni solid solution and high content of chromium. In addition to a large amount of Ni elements, the eutectic region also contains a small amount of Si, Fe, Cr, Mo and other elements. ...

Embodiment example 3

[0019] The nickel-based alloy modified layer is mainly composed of solid solution γ-Ni, Ni 3 B, Ni 3 Fe and a small amount of Ni 3 Si composition, in addition to boride (CrB) and carbide (Cr 7 C 3 , Cr 23 C 6 ). The diffraction peaks of γ-Ni are strong and sharp, while other diffraction peaks are of lower intensity and overlap each other, which is mainly due to the complex crystal structure of carbides, large interplanar spacing and low content.

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Abstract

The invention discloses a surface laser-clad Ni-based alloy. A Ni-based alloy modified layer is prepared on the surface of a Monel 400 alloy with a laser cladding technology. The result indicates thatthe structure of the Ni-based alloy modified layer on the surface of the Monel alloy mainly comprises gamma-Ni solid solutions, multi-element eutectics and some primary precipitates. Laser cladding treatment is performed with an optimized laser irradiation process, the Ni-based alloy modified layer with excellent performance can be obtained, and compared with a Monel 400 alloy substrate, the Ni-based alloy laser modified layer has the microhardness 7 times that of the substrate, obviously reduced friction coefficient and relative wear resistance improved by 8.6 times.

Description

Technical field [0001] The invention relates to a surface coating material, in particular to a surface laser cladding nickel base alloy. Background technique [0002] Monel alloy is a nickel-copper corrosion-resistant alloy mainly composed of nickel. Its typical composition is 70%Ni and 30%Cu. Because of its high strength and good corrosion resistance, it is widely used in high-strength, Working conditions under high pressure and under the action of corrosive media. The rapid development of modern industrial technology puts forward more stringent requirements on the performance of Monel alloy. At present, due to reasons such as preparation technology in China, the Monel alloy produced cannot fully meet the service requirements of specific occasions, and imported components are expensive, such as 8 # The import price of the whole Monel alloy plug valve is as high as 3×104 US dollars. Therefore, it is of great strategic significance and economic benefit to implement strengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C19/03
CPCC23C24/103C22C19/03
Inventor 林艳红
Owner 林艳红
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