CN117684067A - NiCuMoNbReYbC powder-based laser alloy, composite coating and preparation method of composite coating - Google Patents
NiCuMoNbReYbC powder-based laser alloy, composite coating and preparation method of composite coating Download PDFInfo
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Abstract
The invention discloses a laser alloy based on NiCuMoNbReYbC powder, a composite coating and a preparation method of the composite coating, belongs to the technical field of laser alloy, and solves the problems that a laser alloying layer produced by common powder proportioning is easy to deform and crack, poor in strength and toughness matching property, poor in mechanical property and the like by adding Mo, nb, re, yb rare elements on the basis of common laser alloying powder proportioning elements such as NiCuC. The number of cracks of the composite coating prepared by the invention is 0, and the antioxidation speed can reach 0.47g/mm under the high temperature condition 2 H, the abrasion loss can be as low as 0.72g, and the corrosion current is as low as 2.3 mu A/cm 2 Greatly improves the wear resistance, oxidation resistance and high temperature resistance of the alloy coating.
Description
Technical Field
The invention relates to the technical field of laser material increase, in particular to a laser alloy based on NiCuMoNbReYbC powder, a composite coating and a preparation method of the composite coating.
Background
Laser alloying techniques are widely used to improve the properties of material surfaces, including wear resistance, corrosion resistance, oxidation resistance, and high temperature resistance, and play a key role in additive manufacturing. It allows for precisely controlled deposition of materials, build up of complex three-dimensional structures layer by layer for the fabrication of parts, prototypes and custom assemblies. During laser alloying, the substrate and coating experience rapid heating and cooling, which can lead to thermal stresses and distortion, particularly for large and complex structural parts, which can affect the precision and stability of the part.
The common laser alloying powder proportion mainly comprises Ni, cu, C and other elements, and in the laser alloying process, the alloying powder mainly comprising Ni, cu, C elements is easy to react with O in the air to generate more Ni which cannot float upwards 2 O 3 Products such as NiO, cuO and the like become harmful impurities in the alloy layer, and cracks are generated, so that the oxidation resistance and the wear resistance of the material are reduced. Therefore, the invention provides a laser alloy based on NiCuMoNbReYbC powder, a composite coating and a preparation method of the composite coating.
Disclosure of Invention
Aiming at the problems, the invention provides a laser alloy based on NiCuMoNbReYbC powder, a composite coating and a preparation method of the composite coating, wherein Mo, nb, re, yb rare elements are added on the basis of Ni, cu and C elements, so that the high hardness performance of an original alloy layer is reserved, the oxidation resistance and the wear resistance of the material are greatly improved, and the problem that Ni is generated by the reaction of the main elements such as Ni, cu and C with O is effectively solved 2 O 3 Impurity products such as NiO, cuO and the like cause more cracks on the alloy layer, thereby reducing the technical problems of oxidation resistance and wear resistance of the alloy layer.
The first object of the invention is to provide a laser alloy based on NiCuMoNbReYbC powder, which is characterized by comprising the following raw materials in percentage by mass: 20% -30% of Ni, 20% -30% of Cu, 1% -6% of Nb, 10% -20% of Yb, 14% -25% of Re, 10% -20% of Mo, 5% -10% of C and 100% of the total.
The second object of the invention is to provide a laser alloy composite coating, which is manufactured by melting the laser alloy and the adhesive through laser, wherein the mass ratio of the laser alloy to the adhesive is 1:0.03-0.05.
The third object of the present invention is to provide a method for preparing the laser alloy composite coating, which comprises the following steps:
the following raw materials in percentage by mass are respectively weighed: 20% -30% of Ni, 20% -30% of Cu, 1% -6% of Nb, 10% -20% of Yb, 14% -25% of Re, 10% -20% of Mo and 5% -10% of C; adding an adhesive into the weighed raw materials, and uniformly mixing to obtain an alloy powder coating;
and coating the alloy powder coating on the surface of a substrate to form an alloy powder coating, and adopting laser lap joint scanning to the alloy powder coating in an inert gas atmosphere to melt to obtain the laser alloy composite coating.
As a preferred embodiment, the adhesive consists of the following raw materials in mass fraction: 20% -40% of polyurethane resin, 30% -40% of isocyanate, 10% -20% of phenol and 20% -30% of acetone.
As a preferable embodiment, the thickness of the alloy powder coating is 0.2-1.2 mm.
As a preferred embodiment, the laser parameters are: the laser power is 1500W-4000W, the laser scanning speed is 300 mm/min-600 mm/min, and the spot diameter is 2 mm-6 mm.
As a preferable implementation mode, the inert gas is argon, and the flow rate of the argon is 5L/min-25L/min.
As a preferable implementation mode, the ethanol is absolute ethanol, and the mass percentage of the absolute ethanol in the alloy powder coating is 20% -30%.
As a preferred embodiment, the substrate is HT150, copper-based alloy, nickel-based alloy, Q235, 40Cr or 304 stainless steel.
As a preferred embodiment, the substrate surface is sanded, polished and cleaned with acetone having a purity of 98% prior to application of the alloy powder coating to the substrate surface.
Compared with the prior art, the invention has the beneficial effects that:
in order to solve the problems that in the prior art, alloying powder mainly composed of NiCuC and other elements is easy to react with oxygen in the air to generate Ni in the laser alloying process 2 O 3 The invention provides a method for improving the wear resistance, oxidation resistance and high temperature resistance of an alloy coating, which solves the problems that the laser alloying layer produced by common powder proportioning is easy to generate deformation and crack, has poor toughness matching property, poor mechanical property and the like by adding Mo, nb, re, yb rare elements on the basis of common laser alloying powder proportioning elements such as NiCuC and the like, and the interaction among the component alloys improves the wear resistance, oxidation resistance and high temperature resistance of the alloy coating, and is characterized in that:
Mo is dissolved in Re element to form [ Mo, re ]]The binary solid solution phase, mo and Yb element form solid solution alloy, mo and Yb are also solid solution in Re element to form [ Mo, yb, re ]]The three solid solution phases have better strength under the condition of better toughness, so that the formed composite coating has good wear resistance and corrosion resistance. The Mo, yb and Re elements and C form MoC, ybC, reC hard carbides respectively, so that the wear resistance of the composite coating is effectively improved. The Mo and Yb elements have better corrosion resistance and wear resistance, so that the Mo and Yb elements have good effect on improving the surface performance of the composite coating. As-cast Ti-10Mo alloys are solution treated at 900 ℃ and exhibit excellent corrosion resistance. Mo, nb elements may be mixed with other metal alloy elements (e.g., ni, cr, etc.), and alloys formed by solid solution reactions generally have excellent hardness and wear resistance in high temperature, high stress environments. [ Mo, cu ]]The solid solution has adjustable thermal expansion coefficient, good electric conduction and heat conduction properties and excellent high temperature resistance, and the alloy formed by Yb and Nb through solution reaction has certain resistance to some corrosive media, has excellent stability at high temperature and can bear high-temperature and high-stress environments. The oxidation of Mo forms a layered oxide scale, the oxide layer closest to the metal is MoO, and the outer layer is Mo 3 O 4 . When oxidized at a temperature higher than 800 ℃, moO gradually increases in thickness, while Mo 3 O 4 Thickness of layerAnd (3) reducing. The third oxide layer Mo appears below 800 DEG C 2 O 2 An outermost fourth layer of oxide MoO at a temperature below about 450 DEG C 2 The oxidation protection layer is stable, and the Mo can float to the surface of the coating in the oxide generation process, so that a compact oxidation protection layer is formed rapidly, and the oxidation resistance is improved. The prepared composite coating has good oxidation resistance, wear resistance, corrosion resistance and high temperature resistance through the reaction among the alloy elements.
The composite coating prepared by using Ni, cu, mo, nb, re, yb and C powder as raw materials has the crack number of 0, and the antioxidation speed can reach 0.47g/mm under the high-temperature condition 2 H, the abrasion loss can be as low as 0.72g, and the corrosion current is as low as 2.3 mu A/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The alloy powder designed by the invention is proved to be very suitable for laser additive manufacturing.
The alloy composition has reasonable design, strong cooperativity among all the components, reduces the processing cost and improves the processing efficiency, thereby realizing mass rapid processing in factories.
Drawings
FIG. 1 is a schematic diagram of a laser alloyed processing apparatus employed in the present invention;
Reference numerals illustrate:
1. the device comprises an argon bottle, 2, a fiber laser, 3, a control system, 4, a clamp, 5, a laser head, 6, an alloy powder coating, 7, a base material, 8 and a workbench.
Detailed Description
In order that those skilled in the art will better understand the technical solution of the present invention, the present invention will be further described with reference to specific examples, but the examples are not intended to limit the present invention. The following test methods and detection methods, if not specified, are conventional methods; the reagents and starting materials, unless otherwise specified, are commercially available.
Aiming at the prior method for generating Ni by the reaction of the main elements such as Ni, cu, C and the like with O 2 O 3 Impurity products such as NiO, cuO and the like, so that more cracks are generated on the alloy layer, thereby reducing the technical problems of oxidation resistance and wear resistance of the alloy layerAccording to the invention, mo, nb, re, yb rare elements are added on the basis of common laser alloying powder proportioning elements such as NiCuC and the like, and the laser alloy composite coating is prepared by laser melting, so that the wear resistance, oxidation resistance and high temperature resistance of the alloy coating are improved.
In the process of laser melting, mo is dissolved in Re element to form [ Mo, re ] ]The binary solid solution phase, mo and Yb element form solid solution alloy, mo and Yb are also solid solution in Re element to form [ Mo, yb, re ]]The three solid solution phases have better strength under the condition of better toughness, so that the formed composite coating has good wear resistance and corrosion resistance. The Mo, yb and Re elements and C form MoC, ybC, reC hard carbides respectively, so that the wear resistance of the composite coating is effectively improved. The Mo and Yb elements have better corrosion resistance and wear resistance, so that the Mo and Yb elements have good effect on improving the surface performance of the composite coating. As-cast Ti-10Mo alloys are solution treated at 900 ℃ and exhibit excellent corrosion resistance. Mo, nb elements may be mixed with other metal alloy elements (e.g., ni, cr, etc.), and alloys formed by solid solution reactions generally have excellent hardness and wear resistance in high temperature, high stress environments. [ Mo, cu ]]The solid solution has adjustable thermal expansion coefficient, good electric conduction and heat conduction properties and excellent high temperature resistance, and the alloy formed by Yb and Nb through solution reaction has certain resistance to some corrosive media, has excellent stability at high temperature and can bear high-temperature and high-stress environments. The oxidation of Mo forms a layered oxide scale, the oxide layer closest to the metal is MoO, and the outer layer is Mo 3 O 4 . When oxidized at a temperature higher than 800 ℃, moO gradually increases in thickness, while Mo 3 O 4 The thickness of the layer is reduced. The third oxide layer Mo appears below 800 DEG C 2 O 2 An outermost fourth layer of oxide MoO at a temperature below about 450 DEG C 2 The oxidation protection layer is stable, and the Mo can float to the surface of the coating in the oxide generation process, so that a compact oxidation protection layer is formed rapidly, and the oxidation resistance is improved. The prepared composite coating has good oxidation resistance, wear resistance, corrosion resistance and high temperature resistance through the reaction among the alloy elements.
The following examples and comparative examples are provided to illustrate the present invention.
Example 1
A laser alloy based on NiCuMoNbReYbC powder consists of the following raw materials in percentage by mass: 20% Ni, 20% Cu, 6% Nb, 18% Yb, 21% Re, 10% Mo, 5%C.
The preparation method of the laser alloy composite coating manufactured by laser melting of the laser alloy comprises the following steps:
s1: weighing alloy powder with the mass percentage of 20% of Ni, 20% of Cu, 6% of Nb, 18% of Yb, 21% of Re, 10% of Mo and 5%C, adding an adhesive into the weighed alloy powder according to the mass ratio of the laser alloy to the adhesive of 1:0.03, and uniformly mixing to obtain an alloy powder coating; the adhesive is prepared by mixing 20% of polyurethane resin, 40% of isocyanate, 20% of phenol and 20% of acetone in percentage by mass.
S2, polishing and polishing the surface of the HT150 substrate 7, and cleaning by adopting acetone with the purity of 98%.
And S3, uniformly smearing the alloy powder coating on the surface of the cleaned substrate to form an alloy powder coating 6 with the thickness of 0.5mm, drying, placing the substrate 7 coated with the alloy powder coating on a workbench 8, clamping by a clamp 4, carrying out laser alloying operation on the area to be treated by adopting an optical fiber laser 2, and finally forming an alloying coating.
S4, opening the argon bottle 1 to convey argon gas flow to the laser head 5 at a flow rate of 5L/min and blowing the argon gas flow to the surface of the substrate 7.
S5, the fiber laser 2 is turned on, the laser power is adjusted to 2000W, the laser scanning speed is 300 mm/min, the spot diameter is 2mm, the laser beam irradiates the surface of the alloy powder coating 6 through the laser head 5, the workbench 8 is controlled by the control system 3 to move left and right along the X axis, and the laser head 5 moves back and forth along the Y axis or moves up and down along the Z axis, so that the laser beam performs laser alloying treatment on the alloy powder coating 6.
S6, after the laser beam scans the alloy powder coating 6, the optical fiber laser 2 is closed, the argon bottle 1 is closed, and the control system 3 controls the workbench 8 to drive the laser head 5 to return to the original position.
Example 2
A laser alloy based on NiCuMoNbReYbC powder consists of the following raw materials in percentage by mass: 25% Ni, 21% Cu, 4% Nb, 15% Yb, 15% Re, 12% Mo, 8%C.
The preparation method of the laser alloy composite coating manufactured by laser melting of the laser alloy comprises the following steps:
s1: weighing alloy powder with the mass percentage of 25% of Ni, 21% of Cu, 4% of Nb, 15% of Yb, 15% of Re, 12% of Mo and 8%C, adding an adhesive into the weighed alloy powder according to the mass ratio of the laser alloy to the adhesive of 1:0.03, and uniformly mixing to obtain an alloy powder coating; the adhesive is prepared by mixing 40% of polyurethane resin, 30% of isocyanate, 10% of phenol and 20% of acetone in percentage by mass.
S2, polishing the surface of the copper-based alloy substrate 7, and cleaning by adopting acetone with the purity of 98%.
And S3, uniformly smearing the alloy powder coating on the surface of the cleaned substrate to form an alloy powder coating 6 with the thickness of 0.8mm, drying, placing the substrate 7 coated with the alloy powder coating on a workbench 8, clamping by a clamp 4, carrying out laser alloying operation on the area to be treated by adopting an optical fiber laser 2, and finally forming an alloying coating.
S4, opening the argon bottle 1 to convey argon gas flow to the laser head 5 at a flow rate of 10L/min and blowing the argon gas flow to the surface of the substrate 7.
S5, the fiber laser 2 is turned on, the laser power is adjusted to 3000W, the laser scanning speed is 400 mm/min, the spot diameter is 4mm, the laser beam irradiates the surface of the alloy powder coating 6 through the laser head 5, the workbench 8 is controlled by the control system 3 to move left and right along the X axis, and the laser head 5 moves back and forth along the Y axis or moves up and down along the Z axis, so that the laser beam performs laser alloying treatment on the alloy powder coating 6.
S6, after the laser beam scans the alloy powder coating 6, the optical fiber laser 2 is closed, the argon bottle 1 is closed, and the control system 3 controls the workbench 8 to drive the laser head 5 to return to the original position.
Example 3
A laser alloy based on NiCuMoNbReYbC powder consists of the following raw materials in percentage by mass: 30% Ni, 22% Cu, 1% Nb, 10% Yb, 18% Re, 14% Mo, 5%C.
The preparation method of the laser alloy composite coating manufactured by laser melting of the laser alloy comprises the following steps:
s1: weighing alloy powder with the mass percentage of 30% of Ni, 22% of Cu, 1% of Nb, 10% of Yb, 18% of Re, 14% of Mo and 5%C, adding an adhesive into the weighed alloy powder according to the mass ratio of the laser alloy to the adhesive of 1:0.04, and uniformly mixing to obtain an alloy powder coating; the adhesive is prepared by mixing 30% of polyurethane resin, 40% of isocyanate, 10% of phenol and 20% of acetone in percentage by mass.
S2, grinding and polishing the surface of the nickel-based alloy substrate 7, and cleaning with acetone with the purity of 98%.
And S3, uniformly smearing the alloy powder coating on the surface of the cleaned substrate to form an alloy powder coating 6 with the thickness of 1.5mm, drying, placing the substrate 7 coated with the alloy powder coating on a workbench 8, clamping by a clamp 4, carrying out laser alloying operation on the area to be treated by adopting an optical fiber laser 2, and finally forming an alloying coating.
S4, opening the argon bottle 1 to convey argon gas flow to the laser head 5 at a flow rate of 15L/min and blowing the argon gas flow to the surface of the substrate 7.
S5, the fiber laser 2 is turned on, the laser power is adjusted to 4000W, the laser scanning speed is 500 mm/min, the spot diameter is 5mm, the laser beam irradiates the surface of the alloy powder coating 6 through the laser head 5, the workbench 8 is controlled by the control system 3 to move left and right along the X axis, and the laser head 5 moves back and forth along the Y axis or moves up and down along the Z axis, so that the laser beam performs laser alloying treatment on the alloy powder coating 6.
S6, after the laser beam scans the alloy powder coating 6, the optical fiber laser 2 is closed, the argon bottle 1 is closed, and the control system 3 controls the workbench 8 to drive the laser head 5 to return to the original position.
Example 4
A laser alloy based on NiCuMoNbReYbC powder consists of the following raw materials in percentage by mass: 22% Ni, 25% Cu, 3% Nb, 12% Yb, 18% Re, 15% Mo, 5%C.
The preparation method of the laser alloy composite coating manufactured by laser melting of the laser alloy comprises the following steps:
s1: weighing alloy powder with the mass percentage of 22% of Ni, 25% of Cu, 3% of Nb, 12% of Yb, 18% of Re, 15% of Mo and 5%C, adding an adhesive into the weighed alloy powder according to the mass ratio of the laser alloy to the adhesive of 1:0.04, and uniformly mixing to obtain an alloy powder coating; the adhesive is prepared by mixing 25% of polyurethane resin, 35% of isocyanate, 20% of phenol and 20% of acetone in percentage by mass.
S2, polishing the surface of the Q235 substrate 7, and cleaning with acetone with the purity of 98%.
And S3, uniformly smearing the alloy powder coating on the surface of the cleaned substrate to form an alloy powder coating 6 with the thickness of 0.5mm, drying, placing the substrate 7 coated with the alloy powder coating on a workbench 8, clamping by a clamp 4, carrying out laser alloying operation on the area to be treated by adopting an optical fiber laser 2, and finally forming an alloying coating.
S4, opening the argon bottle 1 to convey argon gas flow to the laser head 5 at a flow rate of 5L/min and blowing the argon gas flow to the surface of the substrate 7.
S5, the fiber laser 2 is turned on, the laser power is adjusted to 2500W, the laser scanning speed is 450 mm/min, the spot diameter is 3mm, the laser beam irradiates the surface of the alloy powder coating 6 through the laser head 5, the control system 3 controls the workbench 8 to move left and right along the X axis, and the laser head 5 moves back and forth along the Y axis or moves up and down along the Z axis, so that the laser beam performs laser alloying treatment on the alloy powder coating 6. S6, after the laser beam scans the alloy powder coating 6, the optical fiber laser 2 is closed, the argon bottle 1 is closed, and the control system 3 controls the workbench 8 to drive the laser head 5 to return to the original position.
Example 5
A laser alloy based on NiCuMoNbReYbC powder consists of the following raw materials in percentage by mass: 28% Ni, 26% Cu, 5% Nb, 11% Yb, 15% Re, 10% Mo and 5%C.
The preparation method of the laser alloy composite coating manufactured by laser melting of the laser alloy comprises the following steps:
s1: weighing alloy powder with the mass percentage of 28% of Ni, 26% of Cu, 5% of Nb, 11% of Yb, 15% of Re, 10% of Mo and 5%C, adding an adhesive into the weighed alloy powder according to the mass ratio of the laser alloy to the adhesive of 1:0.05, and uniformly mixing to obtain an alloy powder coating; the adhesive is prepared by mixing 35% of polyurethane resin, 30% of isocyanate, 15% of phenol and 20% of acetone in percentage by mass.
S2, grinding and polishing the surface of the 40Cr substrate 7, and cleaning with acetone with the purity of 98%.
And S3, uniformly smearing the alloy powder coating on the surface of the cleaned substrate to form an alloy powder coating 6 with the thickness of 0.5mm, drying, placing the substrate 7 coated with the alloy powder coating on a workbench 8, clamping by a clamp 4, carrying out laser alloying operation on the area to be treated by adopting an optical fiber laser 2, and finally forming an alloying coating.
S4, opening the argon bottle 1 to convey argon gas flow to the laser head 5 at a flow rate of 5L/min and blowing the argon gas flow to the surface of the substrate 7.
S5, the fiber laser 2 is turned on, the laser power is adjusted to 3500W, the laser scanning speed is 550 mm/min, the spot diameter is 5mm, the laser beam irradiates the surface of the alloy powder coating 6 through the laser head 5, the workbench 8 is controlled by the control system 3 to move left and right along the X axis, and the laser head 5 moves back and forth along the Y axis or moves up and down along the Z axis, so that the laser beam performs laser alloying treatment on the alloy powder coating 6.
S6, after the laser beam scans the alloy powder coating 6, the optical fiber laser 2 is closed, the argon bottle 1 is closed, and the control system 3 controls the workbench 8 to drive the laser head 5 to return to the original position.
Example 6
A laser alloy based on NiCuMoNbReYbC powder consists of the following raw materials in percentage by mass: 21% Ni, 30% Cu, 3% Nb, 14% Yb, 14% Re, 10% Mo, 8%C.
The preparation method of the laser alloy composite coating manufactured by laser melting of the laser alloy comprises the following steps:
s1: weighing alloy powder with the mass percentage of 21% Ni, 30% Cu, 3% Nb, 14% Yb, 14% Re, 10% Mo and 8%C, adding an adhesive into the weighed alloy powder according to the mass ratio of the laser alloy to the adhesive of 1:0.05, and uniformly mixing to obtain an alloy powder coating; the adhesive is prepared by mixing 28% of polyurethane resin, 34% of isocyanate, 13% of phenol and 25% of acetone in percentage by mass.
S2, polishing the surface of the 304 stainless steel substrate 7, and cleaning with acetone with the purity of 98%.
And S3, uniformly smearing the alloy powder coating on the surface of the cleaned substrate to form an alloy powder coating 6 with the thickness of 0.5mm, drying, placing the substrate 7 coated with the alloy powder coating on a workbench 8, clamping by a clamp 4, carrying out laser alloying operation on the area to be treated by adopting an optical fiber laser 2, and finally forming an alloying coating.
S4, opening the argon bottle 1 to convey argon gas flow to the laser head 5 at a flow rate of 5L/min and blowing the argon gas flow to the surface of the substrate 7.
S5, the fiber laser 2 is turned on, the laser power is adjusted to 4000W, the laser scanning speed is 600 mm/min, the spot diameter is 6mm, the laser beam irradiates the surface of the alloy powder coating 6 through the laser head 5, the workbench 8 is controlled by the control system 3 to move left and right along the X axis, and the laser head 5 moves back and forth along the Y axis or moves up and down along the Z axis, so that the laser beam performs laser alloying treatment on the alloy powder coating 6.
S6, after the laser beam scans the alloy powder coating 6, the optical fiber laser 2 is closed, the argon bottle 1 is closed, and the control system 3 controls the workbench 8 to drive the laser head 5 to return to the original position.
To further illustrate the effect of the present invention, the present invention provides a comparative example as follows:
comparative example 1 (Mo element removed)
Compared with the example 1, the difference is that Mo element is removed, and the laser alloy consists of the following raw materials in percentage by mass: 25% Ni, 25% Cu, 6% Nb, 18% Yb, 21% Re, 5%C.
A laser alloy based on NiCuNbReYbC powder consists of the following raw materials in percentage by mass: 25% Ni, 25% Cu, 6% Nb, 18% Yb, 21% Re, 5%C.
The preparation method of the laser alloy composite coating manufactured by laser melting of the laser alloy comprises the following steps:
s1: weighing alloy powder with the mass percentage of 25% of Ni, 25% of Cu, 6% of Nb, 18% of Yb, 21% of Re and 5%C, adding an adhesive into the weighed alloy powder according to the mass ratio of the laser alloy to the adhesive of 1:0.03, and uniformly mixing to obtain an alloy powder coating; the adhesive is prepared by mixing 20% of polyurethane resin, 40% of isocyanate, 20% of phenol and 20% of acetone in percentage by mass.
S2, polishing and polishing the surface of the HT150 substrate 7, and cleaning by adopting acetone with the purity of 98%.
And S3, uniformly smearing the alloy powder coating on the surface of the cleaned substrate to form an alloy powder coating 6 with the thickness of 0.5mm, drying, placing the substrate 7 coated with the alloy powder coating on a workbench 8, clamping by a clamp 4, carrying out laser alloying operation on the area to be treated by adopting an optical fiber laser 2, and finally forming an alloying coating.
S4, opening the argon bottle 1 to convey argon gas flow to the laser head 5 at a flow rate of 5L/min and blowing the argon gas flow to the surface of the substrate 7.
S5, the fiber laser 2 is turned on, the laser power is adjusted to 2000W, the laser scanning speed is 300 mm/min, the spot diameter is 2mm, the laser beam irradiates the surface of the alloy powder coating 6 through the laser head 5, the workbench 8 is controlled by the control system 3 to move left and right along the X axis, and the laser head 5 moves back and forth along the Y axis or moves up and down along the Z axis, so that the laser beam performs laser alloying treatment on the alloy powder coating 6.
S6, after the laser beam scans the alloy powder coating 6, the optical fiber laser 2 is closed, the argon bottle 1 is closed, and the control system 3 controls the workbench 8 to drive the laser head 5 to return to the original position.
Comparative example 2 (Nb element removed)
The difference compared with example 1 is that the Nb element is removed, and the laser alloy consists of the following raw materials in percentage by mass: 23% Ni, 23% Cu, 18% Yb, 21% Re, 10% Mo, 5%C.
A laser alloy based on NiCuMoReYbC powder consists of the following raw materials in percentage by mass: 23% Ni, 23% Cu, 18% Yb, 21% Re, 10% Mo, 5%C.
The preparation method of the laser alloy composite coating manufactured by laser melting of the laser alloy comprises the following steps:
s1: weighing alloy powder with the mass percentage of 23% Ni, 23% Cu, 18% Yb, 21% Re, 10% Mo and 5%C, adding an adhesive into the weighed alloy powder according to the mass ratio of the laser alloy to the adhesive of 1:0.03, and uniformly mixing to obtain an alloy powder coating; the adhesive is prepared by mixing 20% of polyurethane resin, 40% of isocyanate, 20% of phenol and 20% of acetone in percentage by mass.
S2, polishing and polishing the surface of the HT150 substrate 7, and cleaning by adopting acetone with the purity of 98%.
And S3, uniformly smearing the alloy powder coating on the surface of the cleaned substrate to form an alloy powder coating 6 with the thickness of 0.5mm, drying, placing the substrate 7 coated with the alloy powder coating on a workbench 8, clamping by a clamp 4, carrying out laser alloying operation on the area to be treated by adopting an optical fiber laser 2, and finally forming an alloying coating.
S4, opening the argon bottle 1 to convey argon gas flow to the laser head 5 at a flow rate of 5L/min and blowing the argon gas flow to the surface of the substrate 7.
S5, the fiber laser 2 is turned on, the laser power is adjusted to 2000W, the laser scanning speed is 300 mm/min, the spot diameter is 2mm, the laser beam irradiates the surface of the alloy powder coating 6 through the laser head 5, the workbench 8 is controlled by the control system 3 to move left and right along the X axis, and the laser head 5 moves back and forth along the Y axis or moves up and down along the Z axis, so that the laser beam performs laser alloying treatment on the alloy powder coating 6.
S6, after the laser beam scans the alloy powder coating 6, the optical fiber laser 2 is closed, the argon bottle 1 is closed, and the control system 3 controls the workbench 8 to drive the laser head 5 to return to the original position.
Comparative example 3 (Yb element was removed)
Compared with the example 1, the difference is that Yb element is removed, and the laser alloy consists of the following raw materials in percentage by mass: 24% Ni, 24% Cu, 10% Nb, 24% Re, 13% Mo, 5%C.
A laser alloy based on NiCuMoNbRec powder consists of the following raw materials in percentage by mass: 24% Ni, 24% Cu, 10% Nb, 24% Re, 13% Mo, 5%C.
The preparation method of the laser alloy composite coating manufactured by laser melting of the laser alloy comprises the following steps:
s1: weighing alloy powder with the mass percentage of 24% of Ni, 24% of Cu, 10% of Nb, 24% of Re, 13% of Mo and 5%C, adding an adhesive into the weighed alloy powder according to the mass ratio of the laser alloy to the adhesive of 1:0.03, and uniformly mixing to obtain an alloy powder coating; the adhesive is prepared by mixing 20% of polyurethane resin, 40% of isocyanate, 20% of phenol and 20% of acetone in percentage by mass.
S2, polishing and polishing the surface of the HT150 substrate 7, and cleaning by adopting acetone with the purity of 98%.
And S3, uniformly smearing the alloy powder coating on the surface of the cleaned substrate to form an alloy powder coating 6 with the thickness of 0.5mm, drying, placing the substrate 7 coated with the alloy powder coating on a workbench 8, clamping by a clamp 4, carrying out laser alloying operation on the area to be treated by adopting an optical fiber laser 2, and finally forming an alloying coating.
S4, opening the argon bottle 1 to convey argon gas flow to the laser head 5 at a flow rate of 5L/min and blowing the argon gas flow to the surface of the substrate 7.
S5, the fiber laser 2 is turned on, the laser power is adjusted to 2000W, the laser scanning speed is 300 mm/min, the spot diameter is 2mm, the laser beam irradiates the surface of the alloy powder coating 6 through the laser head 5, the workbench 8 is controlled by the control system 3 to move left and right along the X axis, and the laser head 5 moves back and forth along the Y axis or moves up and down along the Z axis, so that the laser beam performs laser alloying treatment on the alloy powder coating 6.
S6, after the laser beam scans the alloy powder coating 6, the optical fiber laser 2 is closed, the argon bottle 1 is closed, and the control system 3 controls the workbench 8 to drive the laser head 5 to return to the original position.
Comparative example 4 (Re element removed)
Compared with the example 1, the difference is that Re element is removed, and the laser alloy consists of the following raw materials in percentage by mass: 22% Ni, 26% Cu, 10% Nb, 20% Yb, 12% Mo and 10% C.
A laser alloy based on NiCuMoNbYbC powder consists of the following raw materials in percentage by mass: 22% Ni, 26% Cu, 10% Nb, 20% Yb, 12% Mo and 10% C.
The preparation method of the laser alloy composite coating manufactured by laser melting of the laser alloy comprises the following steps:
s1: weighing alloy powder with the mass percentage of 22% of Ni, 26% of Cu, 10% of Nb, 20% of Yb, 12% of Mo and 10% of C, adding an adhesive into the weighed alloy powder according to the mass ratio of the laser alloy to the adhesive of 1:0.03, and uniformly mixing to obtain an alloy powder coating; the adhesive is prepared by mixing 20% of polyurethane resin, 40% of isocyanate, 20% of phenol and 20% of acetone in percentage by mass.
S2, polishing and polishing the surface of the HT150 substrate 7, and cleaning by adopting acetone with the purity of 98%.
And S3, uniformly smearing the alloy powder coating on the surface of the cleaned substrate to form an alloy powder coating 6 with the thickness of 0.5mm, drying, placing the substrate 7 coated with the alloy powder coating on a workbench 8, clamping by a clamp 4, carrying out laser alloying operation on the area to be treated by adopting an optical fiber laser 2, and finally forming an alloying coating.
S4, opening the argon bottle 1 to convey argon gas flow to the laser head 5 at a flow rate of 5L/min and blowing the argon gas flow to the surface of the substrate 7.
S5, the fiber laser 2 is turned on, the laser power is adjusted to 2000W, the laser scanning speed is 300 mm/min, the spot diameter is 2mm, the laser beam irradiates the surface of the alloy powder coating 6 through the laser head 5, the workbench 8 is controlled by the control system 3 to move left and right along the X axis, and the laser head 5 moves back and forth along the Y axis or moves up and down along the Z axis, so that the laser beam performs laser alloying treatment on the alloy powder coating 6.
S6, after the laser beam scans the alloy powder coating 6, the optical fiber laser 2 is closed, the argon bottle 1 is closed, and the control system 3 controls the workbench 8 to drive the laser head 5 to return to the original position.
Comparative example 5
The difference is that the mass ratio of Ni element is reduced compared with example 1; the laser alloy consists of the following raw materials in percentage by mass: 10% Ni, 20% Cu, 6% Nb, 28% Yb, 16% Re, 10% Mo and 10% C.
A laser alloy based on NiCuMoNbReYbC powder consists of the following raw materials in percentage by mass: 10% Ni, 20% Cu, 6% Nb, 28% Yb, 16% Re, 10% Mo and 10% C.
The preparation method of the laser alloy composite coating manufactured by laser melting of the laser alloy comprises the following steps:
s1: weighing alloy powder with the mass percentage of 10% of Ni, 20% of Cu, 6% of Nb, 28% of Yb, 16% of Re, 10% of Mo and 10% of C, adding an adhesive into the weighed alloy powder according to the mass ratio of the laser alloy to the adhesive of 1:0.03, and uniformly mixing to obtain an alloy powder coating; the adhesive is prepared by mixing 20% of polyurethane resin, 40% of isocyanate, 20% of phenol and 20% of acetone in percentage by mass.
S2, polishing and polishing the surface of the HT150 substrate 7, and cleaning by adopting acetone with the purity of 98%.
And S3, uniformly smearing the alloy powder coating on the surface of the cleaned substrate to form an alloy powder coating 6 with the thickness of 0.5mm, drying, placing the substrate 7 coated with the alloy powder coating on a workbench 8, clamping by a clamp 4, carrying out laser alloying operation on the area to be treated by adopting an optical fiber laser 2, and finally forming an alloying coating.
S4, opening the argon bottle 1 to convey argon gas flow to the laser head 5 at a flow rate of 5L/min and blowing the argon gas flow to the surface of the substrate 7.
S5, the fiber laser 2 is turned on, the laser power is adjusted to 2000W, the laser scanning speed is 300 mm/min, the spot diameter is 2mm, the laser beam irradiates the surface of the alloy powder coating 6 through the laser head 5, the workbench 8 is controlled by the control system 3 to move left and right along the X axis, and the laser head 5 moves back and forth along the Y axis or moves up and down along the Z axis, so that the laser beam performs laser alloying treatment on the alloy powder coating 6. S6, after the laser beam scans the alloy powder coating 6, the optical fiber laser 2 is closed, the argon bottle 1 is closed, and the control system 3 controls the workbench 8 to drive the laser head 5 to return to the original position.
Comparative example 6
The difference is that the mass ratio of Ni element is improved as compared with example 1; the laser alloy consists of the following raw materials in percentage by mass: 40% Ni, 25% Cu, 1% Nb, 5% Yb, 5% Re, 19% Mo, 5%C.
A laser alloy based on NiCuMoNbReYbC powder consists of the following raw materials in percentage by mass: 40% Ni, 25% Cu, 1% Nb, 5% Yb, 5% Re, 19% Mo, 5%C.
The preparation method of the laser alloy composite coating manufactured by laser melting of the laser alloy comprises the following steps:
S1: weighing alloy powder with the mass percentage of 40% of Ni, 25% of Cu, 1% of Nb, 5% of Yb, 5% of Re, 19% of Mo and 5%C, adding an adhesive into the weighed alloy powder according to the mass ratio of the laser alloy to the adhesive of 1:0.03, and uniformly mixing to obtain an alloy powder coating; the adhesive is prepared by mixing 20% of polyurethane resin, 40% of isocyanate, 20% of phenol and 20% of acetone in percentage by mass.
S2, polishing and polishing the surface of the HT150 substrate 7, and cleaning by adopting acetone with the purity of 98%.
And S3, uniformly smearing the alloy powder coating on the surface of the cleaned substrate to form an alloy powder coating 6 with the thickness of 0.5mm, drying, placing the substrate 7 coated with the alloy powder coating on a workbench 8, clamping by a clamp 4, carrying out laser alloying operation on the area to be treated by adopting an optical fiber laser 2, and finally forming an alloying coating.
S4, opening the argon bottle 1 to convey argon gas flow to the laser head 5 at a flow rate of 5L/min and blowing the argon gas flow to the surface of the substrate 7.
S5, the fiber laser 2 is turned on, the laser power is adjusted to 2000W, the laser scanning speed is 300 mm/min, the spot diameter is 2mm, the laser beam irradiates the surface of the alloy powder coating 6 through the laser head 5, the workbench 8 is controlled by the control system 3 to move left and right along the X axis, and the laser head 5 moves back and forth along the Y axis or moves up and down along the Z axis, so that the laser beam performs laser alloying treatment on the alloy powder coating 6.
S6, after the laser beam scans the alloy powder coating 6, the optical fiber laser 2 is closed, the argon bottle 1 is closed, and the control system 3 controls the workbench 8 to drive the laser head 5 to return to the original position.
Comparative example 7
The difference compared with example 1 is that the mass ratio of the element C is improved; the laser alloy consists of the following raw materials in percentage by mass: 20% Ni, 20% Cu, 6% Nb, 15% Yb, 14% Re, 5% Mo and 20% C.
A laser alloy based on NiCuMoNbReYbC powder consists of the following raw materials in percentage by mass: 20% Ni, 20% Cu, 6% Nb, 15% Yb, 14% Re, 5% Mo and 20% C.
The preparation method of the laser alloy composite coating manufactured by laser melting of the laser alloy comprises the following steps:
s1: weighing alloy powder with the mass percentage of 20% of Ni, 20% of Cu, 6% of Nb, 15% of Yb, 14% of Re, 5% of Mo and 20% of C, adding an adhesive into the weighed alloy powder according to the mass ratio of laser alloy, the adhesive and the solvent of 1:0.03, and uniformly mixing to obtain an alloy powder coating; the adhesive is prepared by mixing 20% of polyurethane resin, 40% of isocyanate, 20% of phenol and 20% of acetone in percentage by mass.
S2, polishing and polishing the surface of the HT150 substrate 7, and cleaning by adopting acetone with the purity of 98%.
And S3, uniformly smearing the alloy powder coating on the surface of the cleaned substrate to form an alloy powder coating 6 with the thickness of 0.5mm, drying, placing the substrate 7 coated with the alloy powder coating on a workbench 8, clamping by a clamp 4, carrying out laser alloying operation on the area to be treated by adopting an optical fiber laser 2, and finally forming an alloying coating.
S4, opening the argon bottle 1 to convey argon gas flow to the laser head 5 at a flow rate of 5L/min and blowing the argon gas flow to the surface of the substrate 7.
S5, the fiber laser 2 is turned on, the laser power is adjusted to 2000W, the laser scanning speed is 300 mm/min, the spot diameter is 2mm, the laser beam irradiates the surface of the alloy powder coating 6 through the laser head 5, the workbench 8 is controlled by the control system 3 to move left and right along the X axis, and the laser head 5 moves back and forth along the Y axis or moves up and down along the Z axis, so that the laser beam performs laser alloying treatment on the alloy powder coating 6.
S6, after the laser beam scans the alloy powder coating 6, the optical fiber laser 2 is closed, the argon bottle 1 is closed, and the control system 3 controls the workbench 8 to drive the laser head 5 to return to the original position.
Comparative example 8
The difference compared to example 1 is that the mass ratio of the C element is reduced; the laser alloy consists of the following raw materials in percentage by mass: 25% Ni, 23% Cu, 11% Nb, 10% Yb, 14% Re, 15% Mo and 2% C.
A laser alloy based on NiCuMoNbReYbC powder consists of the following raw materials in percentage by mass: 25% Ni, 23% Cu, 11% Nb, 10% Yb, 14% Re, 15% Mo and 2% C.
The preparation method of the laser alloy composite coating manufactured by laser melting of the laser alloy comprises the following steps:
s1: weighing alloy powder with the mass percentage of 25% of Ni, 23% of Cu, 11% of Nb, 10% of Yb, 14% of Re, 15% of Mo and 2% of C, adding an adhesive into the weighed alloy powder according to the mass ratio of laser alloy, the adhesive and the solvent of 1:0.03, and uniformly mixing to obtain an alloy powder coating; the adhesive is prepared by mixing 20% of polyurethane resin, 40% of isocyanate, 20% of phenol and 20% of acetone in percentage by mass.
S2, polishing and polishing the surface of the HT150 substrate 7, and cleaning by adopting acetone with the purity of 98%.
And S3, uniformly smearing the alloy powder coating on the surface of the cleaned substrate to form an alloy powder coating 6 with the thickness of 0.5mm, drying, placing the substrate 7 coated with the alloy powder coating on a workbench 8, clamping by a clamp 4, carrying out laser alloying operation on the area to be treated by adopting an optical fiber laser 2, and finally forming an alloying coating.
S4, opening the argon bottle 1 to convey argon gas flow to the laser head 5 at a flow rate of 5L/min and blowing the argon gas flow to the surface of the substrate 7.
S5, the fiber laser 2 is turned on, the laser power is adjusted to 2000W, the laser scanning speed is 300 mm/min, the spot diameter is 2mm, the laser beam irradiates the surface of the alloy powder coating 6 through the laser head 5, the workbench 8 is controlled by the control system 3 to move left and right along the X axis, and the laser head 5 moves back and forth along the Y axis or moves up and down along the Z axis, so that the laser beam performs laser alloying treatment on the alloy powder coating 6.
S6, after the laser beam scans the alloy powder coating 6, the optical fiber laser 2 is closed, the argon bottle 1 is closed, and the control system 3 controls the workbench 8 to drive the laser head 5 to return to the original position.
Comparative example 9
The difference is that the mass ratio of Cu element is reduced as compared with example 1; the laser alloy consists of the following raw materials in percentage by mass: 30% Ni, 10% Cu, 5% Nb, 15% Yb, 15% Re, 15% Mo and 10% C.
A laser alloy based on NiCuMoNbReYbC powder consists of the following raw materials in percentage by mass: 30% Ni, 10% Cu, 5% Nb, 15% Yb, 15% Re, 15% Mo and 10% C.
The preparation method of the laser alloy composite coating manufactured by laser melting of the laser alloy comprises the following steps:
S1: weighing alloy powder with the mass percentage of 30% of Ni, 10% of Cu, 5% of Nb, 15% of Yb, 15% of Re, 15% of Mo and 10% of C, adding an adhesive into the weighed alloy powder according to the mass ratio of the laser alloy to the adhesive of 1:0.03, and uniformly mixing to obtain an alloy powder coating; the adhesive is prepared by mixing 20% of polyurethane resin, 40% of isocyanate, 20% of phenol and 20% of acetone in percentage by mass.
S2, polishing and polishing the surface of the HT150 substrate 7, and cleaning by adopting acetone with the purity of 98%.
And S3, uniformly smearing the alloy powder coating on the surface of the cleaned substrate to form an alloy powder coating 6 with the thickness of 0.5mm, drying, placing the substrate 7 coated with the alloy powder coating on a workbench 8, clamping by a clamp 4, carrying out laser alloying operation on the area to be treated by adopting an optical fiber laser 2, and finally forming an alloying coating.
S4, opening the argon bottle 1 to convey argon gas flow to the laser head 5 at a flow rate of 5L/min and blowing the argon gas flow to the surface of the substrate 7.
S5, the fiber laser 2 is turned on, the laser power is adjusted to 2000W, the laser scanning speed is 300 mm/min, the spot diameter is 2mm, the laser beam irradiates the surface of the alloy powder coating 6 through the laser head 5, the workbench 8 is controlled by the control system 3 to move left and right along the X axis, and the laser head 5 moves back and forth along the Y axis or moves up and down along the Z axis, so that the laser beam performs laser alloying treatment on the alloy powder coating 6.
S6, after the laser beam scans the alloy powder coating 6, the optical fiber laser 2 is closed, the argon bottle 1 is closed, and the control system 3 controls the workbench 8 to drive the laser head 5 to return to the original position.
Comparative example 10
The difference is that the mass ratio of Cu element is improved as compared with example 1; the laser alloy consists of the following raw materials in percentage by mass: 25% Ni, 40% Cu, 1% Nb, 5% Yb, 14% Re, 5% Mo, 10% C.
A laser alloy based on NiCuMoNbReYbC powder consists of the following raw materials in percentage by mass: 25% Ni, 40% Cu, 1% Nb, 5% Yb, 14% Re, 5% Mo, 10% C.
The preparation method of the laser alloy composite coating manufactured by laser melting of the laser alloy comprises the following steps:
s1: weighing alloy powder with the mass percentage of 25% of Ni, 40% of Cu, 1% of Nb, 5% of Yb, 14% of Re, 5% of Mo and 10% of C, adding an adhesive into the weighed alloy powder according to the mass ratio of the laser alloy to the adhesive of 1:0.03, and uniformly mixing to obtain an alloy powder coating; the adhesive is prepared by mixing 20% of polyurethane resin, 40% of isocyanate, 20% of phenol and 20% of acetone in percentage by mass.
S2, polishing and polishing the surface of the HT150 substrate 7, and cleaning by adopting acetone with the purity of 98%.
And S3, uniformly smearing the alloy powder coating on the surface of the cleaned substrate to form an alloy powder coating 6 with the thickness of 0.5mm, drying, placing the substrate 7 coated with the alloy powder coating on a workbench 8, clamping by a clamp 4, carrying out laser alloying operation on the area to be treated by adopting an optical fiber laser 2, and finally forming an alloying coating.
S4, opening the argon bottle 1 to convey argon gas flow to the laser head 5 at a flow rate of 5L/min and blowing the argon gas flow to the surface of the substrate 7.
S5, the fiber laser 2 is turned on, the laser power is adjusted to 2000W, the laser scanning speed is 300 mm/min, the spot diameter is 2mm, the laser beam irradiates the surface of the alloy powder coating 6 through the laser head 5, the workbench 8 is controlled by the control system 3 to move left and right along the X axis, and the laser head 5 moves back and forth along the Y axis or moves up and down along the Z axis, so that the laser beam performs laser alloying treatment on the alloy powder coating 6.
S6, after the laser beam scans the alloy powder coating 6, the optical fiber laser 2 is closed, the argon bottle 1 is closed, and the control system 3 controls the workbench 8 to drive the laser head 5 to return to the original position.
The properties of the above-described NiCuMoNbReYbC powder-based laser alloy composite coatings provided in examples 1-6 and comparative examples 1-10 were examined, respectively, and the results are shown in tables 1 and 2.
Table 1 table for testing the properties of the laser alloy composite coatings of the examples of the invention
Table 2 table for testing the properties of the laser alloy composite coatings of the comparative examples of the present invention
As can be seen from tables 1 and 2, the laser alloyed surface based on NiCuMoNbReYbC powder prepared by the present invention has excellent wear resistance, corrosion resistance and high temperature oxidation resistance. The alloying layers of examples 1-6 of the present invention did not crack and the corrosion current was low2.3μA/cm 2 The abrasion loss is as low as 0.72g under the high temperature condition, and the oxidation speed is 0.47 g/mm 2 H. After the components and the mass percentages of the laser alloying powder are respectively adjusted in comparative examples 1-9, one element is absent in comparative examples 1-4, the specific gravity of one element is improved or reduced in comparative examples 5-10, and the performance of the obtained laser alloying layer is not ideal, and the method is particularly characterized in that the number of cracks on the surface of the laser alloying layer is more, the corrosion resistance is reduced, the wear rate is higher, and the oxidized area is increased.
The laser alloy composite coating obtained in the comparative examples 1 to 10 has poor performance, and the main reason is that:
in comparative example 1, since Mo element reacts with O element in air easily to form oxide, the oxide floats up to the surface layer, a dense oxidation protective layer is formed rapidly, oxidation resistance is improved, and Mo oxide has high temperature resistance and corrosion resistance, so that the lack of Mo element in comparative example 1 directly causes the failure of the above effect, thereby significantly reducing the performance of the alloy layer. Meanwhile, the loss of Mo element leads to the obvious increase of the proportion of other 6 elements, which also leads to the destruction of the balance of the reaction process among the elements, generates impurities, further reduces the performance, and finally leads to the increase of cracks of the alloy layer, and the reduction of the wear resistance and the corrosion resistance.
In comparative example 2, since Nb element is stable in air at room temperature, it is not completely oxidized even when red-heated in oxygen, nb 2 O 5 Since the alloy is stable at high temperature, the wear resistance and oxidation resistance of the metal material can be improved, and therefore, the wear resistance and oxidation resistance of the alloy layer are remarkably reduced due to the absence of Nb element in comparative example 2.
In comparative example 3, since Yb element can not only improve the strength of the material, but also improve the toughness, high-temperature oxidation resistance and corrosion resistance of the steel, reduce the brittleness of the material, and obtain good weldability and formability, the absence of Yb element in comparative example 3 can result in a decrease in the alloy formability of the laser when scanning the alloy coating, and a decrease in corrosion resistance and wear resistance.
In comparative example 4, since Re element can improve the corrosion resistance of the alloy in a high temperature environment, the absence of Re element in comparative example 4 may result in a decrease in the corrosion resistance of the alloy in a high temperature environment when the laser scans the alloy coating. Meanwhile, the lack of Re element also leads to the increase of the proportion of other elements, which leads to the destruction of the reaction between the elements and is unfavorable for the improvement of the alloy performance.
In comparative example 5, since the Cd element can be solid-dissolved with the Ni element, a binary solid-solution phase having corrosion resistance and oxidation resistance is formed. Therefore, decreasing the Ni element ratio and at the same time, the Yb element ratio in comparative example 1 is significantly increased, which results in the destruction of balance in the reaction process between elements, and also results in the degradation of the properties of the alloy layer, further degradation of the properties, and finally, the degradation of the corrosion resistance and oxidation resistance of the alloy layer.
In comparative example 6, ni absorbs a large amount of H element during passivation, and the smaller the particle size, the larger the absorption amount, and the Ni has more active chemical properties and reacts with halogen during heating. At the same time, the increase in the proportion of Ni element results in a decrease in the proportion of other elements, and therefore, in comparative example 2, the proportion of Ni element is increased and the proportion of Re element is decreased, which also results in a decrease in corrosion resistance of the alloy, and eventually, an increase in corrosion current of the alloy and a decrease in performance.
In comparative example 7, the content of the element C is significantly higher than the reasonable range, and excessive element C forms more MoC, ybC, reC three hard carbides, which increases stress concentration points and also reduces the proportion of the element Mo, so that the effect of the element Mo on corrosion resistance and oxidation resistance is reduced, thereby being unfavorable for improving the performance.
In comparative example 8, the proportion of the element C is reduced, and since the element C has stable chemical properties and wear resistance, it can withstand water invasion, high temperature and high pressure without damage, reducing the element C results in reduction of hard carbide, reduction of hardness of the alloy layer, and meanwhile, the proportion of other elements is increased to affect the reaction between the elements, thereby reducing the positive effect of other elements on the performance of the alloy layer and being unfavorable for improvement of performance.
In comparative example 9, the Cu element ratio was reduced, so that energy generated by laser could not be uniformly transferred in the powder, and thus stress was generated in the alloy layer to cause cracks, and oxidation of the alloy was also intensified. The reduction of Cu element also leads to the increase of the proportion of other elements, and the reaction among elements is destroyed, which is unfavorable for the improvement of performance.
In comparative example 10, the Cu content was too high to react with O element in the air to generate a large amount of oxide and impurities, and the Mo and Nb element ratio was also reduced to reduce the alloy formed by the solution reaction, thereby reducing the hardness and wear resistance of the alloy. Thus, the adverse effect of the improvement in performance is apparent.
Various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (9)
1. The NiCuMoNbReYbC powder-based laser alloy is characterized by comprising the following raw materials in percentage by mass: 20% -30% of Ni, 20% -30% of Cu, 1% -6% of Nb, 10% -20% of Yb, 14% -25% of Re, 10% -20% of Mo, 5% -10% of C and 100% of the total.
2. The laser alloy composite coating is characterized by being manufactured by laser melting of the laser alloy and the adhesive according to claim 1, wherein the mass ratio of the laser alloy to the adhesive is 1:0.03-0.05.
3. The method for preparing the laser alloy composite coating according to claim 2, comprising the following steps:
the following raw materials in percentage by mass are respectively weighed: 20% -30% of Ni, 20% -30% of Cu, 1% -6% of Nb, 10% -20% of Yb, 14% -25% of Re, 10% -20% of Mo and 5% -10% of C; adding an adhesive into the weighed raw materials, and uniformly mixing to obtain an alloy powder coating;
and coating the alloy powder coating on the surface of a substrate to form an alloy powder coating, and adopting laser lap joint scanning to the alloy powder coating in an inert gas atmosphere to melt to obtain the laser alloy composite coating.
4. A method of preparation according to claim 3, wherein the binder consists of the following raw materials in mass fraction: 20% -40% of polyurethane resin, 30% -40% of isocyanate, 10% -20% of phenol and 20% -30% of acetone.
5. The method of claim 3, wherein the alloy powder coating has a thickness of 0.2 to 1.2mm.
6. A method of manufacturing according to claim 3, wherein the parameters of the laser are: the laser power is 1500W-4000W, the laser scanning speed is 300 mm/min-600 mm/min, and the spot diameter is 2 mm-6 mm.
7. The method according to claim 3, wherein the inert gas is argon, and the flow rate of the argon is 5L/min to 25L/min.
8. The method of claim 3, wherein the substrate is HT150, copper-based alloy, nickel-based alloy, Q235, 40Cr or 304 stainless steel.
9. A method of preparing as claimed in claim 3 wherein the substrate surface is sanded, polished and cleaned with acetone having a purity of 98% prior to application of the alloy powder coating to the substrate surface.
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| CN111349800A (en) * | 2020-03-25 | 2020-06-30 | 石家庄铁道大学 | Preparation method of high-entropy alloy duplex process |
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