Powder for laser high-entropy alloying of nickel single-element-based alloy surface and its preparation process

A high-entropy alloy, single-element technology, applied in metal material coating process, coating and other directions, can solve the problems of coating forming quality and surface continuity can not meet the requirements of use, achieve excellent surface performance, simple crystal structure, The effect of expanding the scope of application

Active Publication Date: 2017-06-16
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large differences in thermal physical properties such as density, melting point, specific heat and expansion coefficient between different types of metal elements in high-entropy alloy powders and between them and the base material, they are directly used for laser cladding, thermal spraying, etc. Surface technology is difficult to obtain a coating with uniform composition, resulting in the coating's forming quality and surface continuity failing to meet production requirements

Method used

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  • Powder for laser high-entropy alloying of nickel single-element-based alloy surface and its preparation process
  • Powder for laser high-entropy alloying of nickel single-element-based alloy surface and its preparation process
  • Powder for laser high-entropy alloying of nickel single-element-based alloy surface and its preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of FeCoCrAl quaternary alloy powders.

[0036] Fe, Co, Cr, Al quaternary alloy powders are configured in an equimolar ratio of 1:1:1:1, and the configured alloy powders need to be ball milled in a star ball mill or ground and mixed in a mortar for 2 to 5 hours. The ball milling or grinding of the mixed powder is carried out at room temperature, the temperature is 23±1°C, the relative humidity is 40±10%, and then the evenly mixed powder is dried in a vacuum drying oven for 2 to 8 hours. Alloy powder did not react.

Embodiment 2

[0038] Preparation of FeCoCrAlNi Laser High Entropy Alloying Coating on Ni201 Substrate Surface.

[0039] Fe, Co, Cr, Al quaternary alloy powders are prepared at a molar ratio of 1:1:1:1, the mixed powders are ball milled or ground, and then the evenly mixed powders are dried in a vacuum drying oven for 2 to 8 hours. The dried alloy powder is pre-placed on the surface of the Ni201 alloy substrate, and the thickness of the pre-placed alloy powder is 0.5-1.5 mm; 2 The laser performs single-pass and multi-pass laser irradiation. The specific process parameters are: laser output power 2kW, laser wavelength 10640nm, spot diameter 3mm, scanning speed 1-10mm / s, laser beam large-area scanning overlap rate 50 %. During the laser alloying process, the protective gas argon flow rate is 10-20L / min, and the thickness of the obtained laser alloyed layer is 0.4-1.5mm.

Embodiment 3

[0041] Microhardness distribution of FeCoCrAlNi laser alloyed layer cross section.

[0042] Fe, Co, Cr, Al quaternary alloy powders are prepared at a molar ratio of 1:1:1:1, the mixed powders are ball milled or ground, and then the evenly mixed powders are dried in a vacuum drying oven for 2 to 8 hours. The dried alloy powder is pre-placed on the surface of the Ni201 alloy substrate, and the thickness of the pre-placed alloy powder is 0.5-1.5 mm; 2 The laser performs single-pass and multi-pass laser irradiation. The selected process parameters are: laser output power 2kW, laser wavelength 10640nm, spot diameter 3mm, scanning speed 1-10mm / s, laser beam large-area scanning overlap rate 50 %. The protective gas argon flow rate in laser alloying is 10-20L / min, and the thickness of the obtained laser alloyed layer is 0.4-1.5mm.

[0043] Use the HVS-1000 hardness tester to measure the microhardness of the cross-section of the laser high-entropy alloying layer. Vickers (Vikcers) in...

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Abstract

The invention discloses a powder for laser high-entropy alloying on the surface of a nickel single-element-based alloy and a preparation process thereof, belonging to the technical field of surface engineering. The high-entropy alloy powder composition is composed of four metal elements, Fe, Co, Cr, and Al, and the content of each element is in an equimolar ratio of 1:1:1:1. Using the method of laser alloying and selecting appropriate process parameters, a FeCoCrAlNi high-entropy alloyed layer with smooth surface, metallurgical bonding and excellent performance was successfully prepared on the surface of Ni-based alloy. Due to the high mixing entropy effect, the high-entropy alloyed layer prepared by the present invention suppresses the disadvantages of a large number of intermetallic compounds produced in the solidification process of the traditional multi-principal alloy, and the phase composition of the alloyed layer is a simple solid solution structure, thereby reducing the alloy The brittleness of the chemical layer, and the coating has excellent properties such as high hardness and wear resistance, which can be applied to the field of surface engineering technology and has broad application prospects.

Description

technical field [0001] The invention relates to a formula and a process method for preparing high-entropy alloy coating material powder by laser reaction synthesis on the surface of a nickel-based material-nickel single-element-based alloy substrate and belongs to the technical field of surface engineering. Background technique [0002] The traditional alloy design concept is generally to select one or two main elements, and add other trace elements to change the microstructure and properties of the alloy. The microstructure and properties of the alloy thus designed are mostly limited by the main elements, and brittleness may occur at the same time. Intermetallic compounds, thus limiting the application of alloys in many fields. Taiwanese scholar Yeh and others took the lead in jumping out of the framework of traditional alloy design and proposed a new alloy design concept, that is, multi-principal element high-mixing entropy alloy. The alloy has five or more principal elem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00C22C30/00C23C24/10
Inventor 张春华吴臣亮张松李琴赵超越
Owner SHENYANG POLYTECHNIC UNIV
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