A powder for laser high-entropy alloying of iron single-element-based alloy surface

A high-entropy alloy, single-element technology, applied in metal material coating process, coating, melt spraying and other directions, can solve the problems of coating forming quality and surface continuity can not meet the requirements of use, and achieve a simple solid solution phase structure , the effect of reducing brittleness

Active Publication Date: 2017-03-15
SHENYANG POLYTECHNIC UNIV
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  • Description
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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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  • A powder for laser high-entropy alloying of iron single-element-based alloy surface
  • A powder for laser high-entropy alloying of iron single-element-based alloy surface
  • A powder for laser high-entropy alloying of iron single-element-based alloy surface

Examples

Experimental program
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Effect test

Embodiment 1

[0060] Fe on the surface of Q235 steel substrate 0 Preparation of CoCrAlCu Laser High Entropy Alloyed Coatings.

[0061] Prepare Fe at a molar ratio of 0:1:1:1:1 0 CoCrAlCu alloy powder, wherein the mole fraction of Fe is 0, the powder prepared by pure metal powder is pre-ground and dried, and then placed on the surface of Q235 steel substrate, and the thickness of the pre-alloyed powder is 0.5-1.5mm. Use ZQM-SD 500W Nd:YAG solid-state pulsed laser for single-pass and multi-pass laser irradiation. The specific process parameters are: voltage 380V, current 120-190A, spot diameter 1.2mm, scanning speed 3-5mm / s . DLA61300 semiconductor laser is used, the laser output power is 2kW, the laser wavelength is 980±10nm, the spot diameter is 3mm, and the scanning speed is 5-40mm / s. The overlapping rate of large-area laser beam scanning is 50%, the protective gas argon flow rate in the laser alloying process is 10-20L / min, and the thickness of the obtained laser alloyed layer is 0.4-0...

Embodiment 2

[0063] Fe on Q235 steel substrate 0.5 Preparation of CoCrAlCu Laser High Entropy Alloying Coatings.

[0064] Prepare Fe at a molar ratio of 0.5:1:1:1:1 0.5 CoCrAlCu alloy powder, the powder prepared by pure metal powder is pre-placed on the surface of Q235 steel base material after grinding and drying, and the thickness of the pre-placed alloy powder is 0.5-1.5mm. The ZQM-SD 500WNd:YAG solid-state pulsed laser is used for single-pass and multi-pass irradiation. The specific process parameters are: voltage 380V, current 120-170A, spot diameter 1.2mm, scanning speed 3-5mm / s. DLA61300 semiconductor laser is used, the laser output power is 2kW, the laser wavelength is 980±10nm, the spot diameter is 3mm, and the scanning speed is 5-40mm / s. The overlapping rate of large-area laser beam scanning is 50%, the flow rate of protective gas argon in the laser alloying process is 10-20L / min, and the thickness of the obtained laser alloyed layer is 0.5-1.0mm.

Embodiment 3

[0066] Preparation of FeCoCrAlCu high-entropy alloy coating on Q235 steel substrate.

[0067] The FeCoCrAlCu alloy powder is prepared according to the equimolar ratio, and the powder prepared by using pure metal powder is ground and dried, and then placed on the surface of the Q235 steel base material, and the thickness of the alloy powder is 0.5-1.5mm. The ZQM-SD 500W Nd:YAG solid-state pulsed laser is used for single-pass and multi-pass irradiation. The specific process parameters are: voltage 380V, current 110-150A, spot diameter 1.2mm, scanning speed 3-5mm / s. DLA61300 semiconductor laser is used, the laser output power is 2kW, the laser wavelength is 980±10nm, the spot diameter is 3mm, and the scanning speed is 5-40mm / s. The overlapping rate of large-area laser beam scanning is 50%, the flow rate of protective gas argon in the laser alloying process is 10-20L / min, and the thickness of the obtained laser alloyed layer is 0.7-1.5mm.

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Abstract

The invention discloses a powder for synthesizing a high-entropy alloy coating material by laser reaction on the surface of an iron single-element-based alloy substrate, which belongs to the technical field of surface engineering and provides a new alloy powder for preparing a high-entropy alloy coating. This powder composition is composed of 5 or more metal elements, and its constituent elements contain the main element iron of the single-element-based alloy substrate, and the determined single-element-based alloy main element iron accounts for the total mole of the coating alloy powder. 0~30% of the fraction, while the addition content of other types of elements in the alloy powder accounts for 5~35mol% of the total moles of the alloy powder. Using appropriate laser irradiation process parameters, a high-entropy alloy coating with a metallurgical combination with the iron-based alloy substrate, uniform and fine structure, no cracks, and excellent performance can be prepared by laser reaction synthesis surface alloying method.

Description

[0001] Technical field: [0002] 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 steel material-iron single-element-based alloy substrate. [0003] Background technique: [0004] In the 1990s, scholars in Taiwan took the lead in breaking through the traditional alloy design mode, put forward a new alloy design concept, and successfully prepared multi-principal high-entropy alloys. High-entropy alloys have attracted widespread attention and active exploration of scholars at home and abroad since they were proposed. Entropy is a parameter that represents the degree of disorder in thermodynamics. The more elements in an alloy system, the greater the degree of disorder, the higher the entropy value. In multi-principal high-entropy alloys, the number of components is defined between 5 and 13, and each element has a relatively high atomic fraction, but its content will no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/08B22F1/00C23C24/10C22C30/02
Inventor 张春华王超张松吴臣亮伊俊振李琴单丽娜韩维娜李杰勋孙晗刘杰
Owner SHENYANG POLYTECHNIC UNIV
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