CN110241421B - Grid type wear-resistant reinforced coating, wear-resistant lining plate using same and preparation method thereof - Google Patents
Grid type wear-resistant reinforced coating, wear-resistant lining plate using same and preparation method thereof Download PDFInfo
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- 239000000956 alloy Substances 0.000 claims abstract description 186
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 186
- 238000004372 laser cladding Methods 0.000 claims abstract description 26
- 238000005728 strengthening Methods 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims description 32
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
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Abstract
The invention provides a grid type wear-resistant strengthening coating and a preparation method thereof, and a wear-resistant lining plate and a preparation method thereof, and belongs to the technical field of metal surface engineering. Alloy powder A and alloy powder B are preset on the surface of a device to be strengthened, in the obtained alloy powder layer, the alloy powder A and the alloy powder B are alternately distributed in a strip shape, and then laser cladding is carried out to obtain a grid type wear-resistant strengthened coating; the alloy powder A comprises the following components in percentage by mass: 2.2-3.2% of Ni powder, 15-18% of Cr powder, 0.25-0.35% of C powder, 2.0-3.5% of Co powder and the balance of Fe powder; the alloy powder B comprises the following components in percentage by mass: 2.2-3.2% of Ni powder, 15-18% of Cr powder, 0.25-0.35% of C powder, 2.0-3.5% of Co powder, 10-25% of WC powder and the balance of Fe powder.
Description
Technical Field
The invention relates to the technical field of metal surface engineering, in particular to a grid type wear-resistant strengthening coating and a preparation method thereof, and a wear-resistant lining plate and a preparation method thereof.
Background
Various high-grade lining plates are widely applied to the metallurgical industry. For example, in the process of rolling steel plates by a rolling mill, moving parts in the rolling mill have great abrasion to fixed lining plates on a housing of the rolling mill, the moving parts are frequently replaced in the actual use process, and the downtime is increased. How to improve the wear resistance of the lining plate so as to prolong the service life of the lining plate is a problem to be solved urgently in the metallurgical industry. The conventional method for improving the wear resistance of the lining plate is to modify the surface of the lining plate by using metal surface modification technologies such as surfacing, plasma, spray welding and the like, but the method has large thermal deformation, is difficult to ensure the high-precision requirements on size and shape, cannot be used for surface reinforcement of a high-grade lining plate, and has a certain reinforcement effect on the high-grade lining plate in the modes of surface quenching, induction heating and the like, but has a limited reinforcement effect and cannot meet the requirements of severe working conditions of the high-grade lining plate.
Disclosure of Invention
The invention aims to provide a grid type wear-resistant reinforced coating and a preparation method thereof, and a wear-resistant lining plate and a preparation method thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a grid type wear-resistant reinforced coating, which is prepared by the following method: presetting alloy powder A and alloy powder B on the surface of a device to be strengthened, wherein the alloy powder A and the alloy powder B are alternately distributed in a strip shape in the obtained alloy powder layer, and then carrying out laser cladding to obtain a grid type wear-resistant strengthened coating;
the alloy powder A comprises the following components in percentage by mass: 2.2-3.2% of Ni powder, 15-18% of Cr powder, 0.25-0.35% of C powder, 2.0-3.5% of Co powder and the balance of Fe powder;
the alloy powder B comprises the following components in percentage by mass: 2.2-3.2% of Ni powder, 15-18% of Cr powder, 0.25-0.35% of C powder, 2.0-3.5% of Co powder, 10-25% of WC powder and the balance of Fe powder.
Preferably, the particle sizes of the alloy powder A and the alloy powder B are 135-325 meshes independently.
Preferably, the laser cladding parameters are as follows: the laser power is 3.8-4.0 kW, the rectangular light spot is 2 multiplied by 14mm, the lap joint rate is 30-50%, and the scanning speed is 500-650 mm/min.
Preferably, in the alloy powder layer, the width of a strip formed by the alloy powder A and the alloy powder B is 0.4-0.6 mm.
The invention also provides a preparation method of the grid type wear-resistant reinforced coating, which comprises the following steps:
providing a grating capable of covering the surface of a device to be strengthened, wherein the width of a grating groove of the grating is the same as that of a grating strip, and the length of the grating groove of the grating is not less than that of the surface of the device to be strengthened;
placing the grid on the surface of a device to be reinforced, filling alloy powder A into the grid groove until the height of the alloy powder A is flush with that of the grid groove, then translating the grid along the direction vertical to grid bars of the grid, and providing support below the grid to enable the bottom of the grid groove of the grid to be the same as the thickness of the alloy powder A, and the translation distance of the grid to be the same as the width of the grid groove; then, alloy powder B is filled into the grid groove until the height of the alloy powder B is flush with the bottom of the grid groove, and an alloy powder layer is obtained;
and carrying out laser cladding on the alloy powder layer to obtain the grid type wear-resistant reinforced coating.
Preferably, alloy powder a and alloy powder B are filled using an electrostatic duster.
Preferably, the grid is prepared by a laser cutting method.
The invention also provides a wear-resistant lining plate, which comprises a lining plate base body and a strengthening coating, wherein the strengthening coating is the grid type wear-resistant strengthening coating in the technical scheme or the grid type wear-resistant strengthening coating obtained by the preparation method in the technical scheme, and the strengthening coating and the lining plate base body are in metallurgical bonding.
Preferably, the thickness of the reinforced coating is 0.5-2 mm.
The invention also provides a preparation method of the wear-resistant lining plate, which comprises the following steps:
according to the preparation method of the technical scheme, the reinforced coating is prepared on the surface of the lining plate substrate, and the wear-resistant lining plate is obtained.
The invention provides a grid type wear-resistant reinforced coating, which is prepared by the following method: presetting alloy powder A and alloy powder B on the surface of a device to be strengthened, wherein the alloy powder A and the alloy powder B are alternately distributed in a strip shape in the obtained alloy powder layer, and then carrying out laser cladding to obtain a grid type wear-resistant strengthened coating; the alloy powder A comprises the following components in percentage by mass: 2.2-3.2% of Ni powder, 15-18% of Cr powder, 0.25-0.35% of C powder, 2.0-3.5% of Co powder and the balance of Fe powder; the alloy powder B comprises the following components in percentage by mass: 2.2-3.2% of Ni powder, 15-18% of Cr powder, 0.25-0.35% of C powder, 2.0-3.5% of Co powder, 10-25% of WC powder and the balance of Fe powder. In the invention, the alloy powder A and the alloy powder B are alternately distributed in a strip shape, and when laser cladding is carried out, the alloy powder A does not contain WC, so that the residual stress after laser cladding is small, the larger residual stress generated when the alloy powder B containing WC is clad can be offset, and the cracking tendency of a coating is further reduced; after laser cladding, A, B alternate grid type wear-resistant reinforced coatings are formed, and under the combined action of all the components, the coatings have excellent wear resistance, corrosion resistance and high temperature resistance, so that the service life of the device is prolonged; in addition, compared with a coating formed by completely using the alloy powder B, the service life of the coating obtained by the method is only reduced by 8-20%, but the using amount of WC is reduced by about 50%, namely the precious metal W is saved, and higher cost performance is realized.
Drawings
FIG. 1 is a macroscopic view of the grid used in example 1;
fig. 2 is a schematic diagram of the wear-resistant lining plate of sample 1 obtained in example 1.
Detailed Description
The invention provides a grid type wear-resistant reinforced coating, which is prepared by the following method: presetting alloy powder A and alloy powder B on the surface of a device to be strengthened, wherein the alloy powder A and the alloy powder B are alternately distributed in a strip shape in the obtained alloy powder layer, and then carrying out laser cladding to obtain a grid type wear-resistant strengthened coating;
the alloy powder A comprises the following components in percentage by mass: 2.2-3.2% of Ni powder, 15-18% of Cr powder, 0.25-0.35% of C powder, 2.0-3.5% of Co powder and the balance of Fe powder;
the alloy powder B comprises the following components in percentage by mass: 2.2-3.2% of Ni powder, 15-18% of Cr powder, 0.25-0.35% of C powder, 2.0-3.5% of Co powder, 10-25% of WC powder and the balance of Fe powder.
In the invention, the alloy powder A comprises 2.2-3.2% of Ni powder, preferably 2.5-3.0%, and more preferably 2.7-2.8% by mass; the purity of the Ni powder is preferably greater than 99.9%. In the present invention, the Ni powder can improve hardness and heat resistance of the coating layer.
In the invention, the alloy powder A comprises 15-18% by mass of Cr powder, preferably 16-17% by mass of Cr powder; the purity of the Cr powder is preferably more than 99.9%. In the invention, the Cr powder can improve the hardness and heat resistance of the coating.
In the invention, the alloy powder A comprises 0.25-0.35% of C powder, preferably 0.28-0.32% by mass; the purity of the C powder is preferably greater than 99.9%.
In the invention, the alloy powder A comprises 2.0-3.5% by mass of Co powder, preferably 2.3-2.8%; the purity of the Co powder is preferably greater than 99.9%. In the invention, the Co powder can improve the hardness and the heat resistance of the coating and can also improve the corrosion resistance of the coating.
In the invention, the alloy powder B comprises 2.2-3.2% of Ni powder, preferably 2.5-3.0%, and more preferably 2.7-2.8% by mass; the purity of the Ni powder is preferably greater than 99.9%. In the present invention, the Ni powder can improve hardness and heat resistance of the coating layer.
In the invention, the alloy powder B comprises 15-18% by mass of Cr powder, preferably 16-17% by mass of Cr powder; the purity of the Cr powder is preferably more than 99.9%. In the invention, the Cr powder can improve the hardness and heat resistance of the coating.
In the invention, the alloy powder B comprises 0.25-0.35% of C powder, preferably 0.28-0.32% of C powder by mass percentage; the purity of the C powder is preferably greater than 99.9%.
In the invention, the alloy powder B comprises 2.0-3.5% by mass of Co powder, preferably 2.3-2.8%; the purity of the Co powder is preferably greater than 99.9%. According to the invention, the Co powder can improve the hardness and heat resistance of the coating and can also improve the corrosion resistance of the coating.
In the invention, the alloy powder B comprises 10-25% of WC powder, preferably 15-20% by mass; the purity of the WC powder is preferably greater than 99.9%. In the invention, the WC powder can play a role in dispersion strengthening so as to improve the hardness of the coating, particularly, the WC belongs to ceramic powder, the wettability of the ceramic powder with metal is poor, only part of the WC forms new compounds with metal materials in the cladding process, and the other part of the WC forms W2C, the rest WC is not decomposed and uniformly distributedThe alloy powder A does not contain WC, so that the residual stress formed after cladding is small, the residual stress in the cladding process of the alloy powder B can be counteracted, the cracking tendency of the coating is further reduced, and the coating with high hardness and strong cracking resistance is obtained.
In the present invention, the purity of the Fe powder in the alloy powder a and the alloy powder B is preferably independently more than 99.9%.
In the invention, the granularity of the alloy powder A and the granularity of the alloy powder B are independent, preferably 135-325 meshes, more preferably 150-300 meshes, and most preferably 200-250 meshes. In the invention, the particle size is beneficial to improving the fluidity of the alloy powder in the laser cladding process so as to improve the quality of the cladding layer and prevent the generation of defects such as holes in the cladding layer.
In the invention, in the alloy powder layer, the width of a strip formed by the alloy powder A and the alloy powder B is preferably 0.4-0.6 mm, and more preferably 0.5 mm; the strip shape formed of the alloy powder a and the strip shape formed of the alloy powder B preferably have the same width.
In the invention, the laser cladding parameters are as follows: the laser power is preferably 3.8-4.0 kW, and more preferably 3.9 kW; the rectangular light spot is preferably 2X 14 mm; the lapping rate is preferably 30-50%, and more preferably 35-45%; the scanning speed is preferably 500 to 650mm/min, and more preferably 550 to 600 mm/min. In the invention, the parameters are beneficial to refining grains and further improving the wear resistance of the coating.
The invention provides a preparation method of a grid type wear-resistant reinforced coating, which comprises the following steps:
providing a grating capable of covering the surface of a device to be strengthened, wherein the width of a grating groove of the grating is the same as that of a grating strip, and the length of the grating groove of the grating is not less than that of the surface of the device to be strengthened;
placing the grid on the surface of a device to be reinforced, filling alloy powder A into the grid groove until the height of the alloy powder A is flush with that of the grid groove, then translating the grid along the direction vertical to grid bars of the grid, and providing support below the grid to enable the bottom of the grid groove of the grid to be the same as the thickness of the alloy powder A, and the translation distance of the grid to be the same as the width of the grid groove; then, alloy powder B is filled into the grid groove until the height of the alloy powder B is flush with the bottom of the grid groove, and an alloy powder layer is obtained;
and carrying out laser cladding on the alloy powder layer to obtain the grid type wear-resistant reinforced coating.
The invention firstly provides a grid which can cover the surface of a device to be strengthened, the width of a grid groove of the grid is the same as that of a grid strip, and the length of the grid groove of the grid is not less than that of the surface of the device to be strengthened.
In the invention, the width of the grid groove and the width of the grid bar of the grid are the width of the bar formed by the alloy powder A and the alloy powder B.
The source of the grid is not particularly limited, and a suitable grid sold in the market can be made by a user or adopted; in the embodiment of the present invention, the grating is preferably prepared by a laser cutting method.
The thickness of the grid is not particularly limited in the present invention, and those skilled in the art can select the thickness of the grid according to the thickness of the coating to be prepared.
In the present invention, the material of the grid is not particularly limited, and in the embodiment of the present invention, the material of the grid is preferably a steel plate.
In the embodiment of the invention, the macroscopic view of the grid is a rectangular grid as shown in fig. 1, and the widths of the grid bars and the grid grooves of the grid are the same.
After the grid is obtained, the grid is placed on the surface of a device to be reinforced, alloy powder A is filled into the grid groove until the height of the alloy powder A is flush with that of the grid groove, then the grid is translated along the direction vertical to grid bars of the grid, and support is provided below the grid, so that the thickness of the bottom of the grid groove of the grid is the same as that of the alloy powder A, and the translation distance of the grid is the same as the width of the grid groove; and then filling alloy powder B into the gate groove until the height of the alloy powder B is flush with the bottom of the gate groove, so as to obtain an alloy powder layer.
In the present invention, the height of the gate groove is the thickness of the grid.
The alloy powder A and the alloy powder B are preferably filled by using an electrostatic powder blower.
In the invention, when an electrostatic powder sprayer is adopted to fill alloy powder A into a grid groove until the height of the alloy powder A is level with that of the grid groove, the grid is preferably moved away, the residual alloy powder A falling on grid bars of the grid is collected, then the grid is suspended and placed at the position of the grid when the alloy powder A is filled, the grid is translated along the direction vertical to the grid bars by the distance equal to the width of the grid groove, a support is provided below the grid, the thickness of the bottom of the grid groove of the grid is the same as that of the alloy powder A, then the alloy powder B is filled into the grid groove by the electrostatic powder sprayer until the height of the alloy powder B is level with that of the bottom of the grid groove, the grid is moved away, and the residual alloy powder B on the grid is collected to obtain an alloy powder layer; in the present invention, the support is not particularly limited, and the bottom of the grid groove of the grid may be made to have the same thickness as the alloy powder a.
The material of the device to be strengthened is not particularly limited, and in the embodiment of the invention, the device to be strengthened is preferably steel, and more preferably 45 steel.
After the alloy powder layer is obtained, the alloy powder layer is subjected to laser cladding to obtain the grid type wear-resistant reinforced coating.
The invention also provides a wear-resistant lining plate, which comprises a lining plate base body and a strengthening coating, wherein the strengthening coating is the grid type wear-resistant strengthening coating in the technical scheme or the grid type wear-resistant strengthening coating obtained by the preparation method in the technical scheme, and the strengthening coating and the lining plate base body are in metallurgical bonding.
In the invention, the thickness of the reinforced coating is preferably 0.5-2.0 mm, and more preferably 1.5 mm. In the invention, the thickness can be obtained through one-time cladding, the residual stress is small, the bonding force with a matrix is strong, the falling is not easy, and the use requirement of the wear-resistant lining plate can be met.
The invention also provides a preparation method of the wear-resistant lining plate, which comprises the following steps:
according to the preparation method of the technical scheme, the reinforced coating is prepared on the surface of the lining plate substrate, and the wear-resistant lining plate is obtained.
The present invention provides a grid-type wear-resistant reinforced coating and a method for preparing the same, a wear-resistant lining plate and a method for preparing the same, which are described in detail below with reference to the examples, but they should not be construed as limiting the scope of the present invention.
Example 1
(1) Selecting a rectangular thin steel plate with the thickness of 1.5mm, and processing uniformly distributed rectangular grids on the surface of the rectangular thin steel plate by a laser cutting method, wherein as shown in figure 1, the width of grid bars is 0.5mm, the width of grid grooves is 0.5mm, the grids can cover the working surface of a lining plate to be reinforced, and the length of the grid grooves of the grids is not less than the length of the surface of a device to be reinforced;
(2) preparing alloy powder A and alloy powder B according to the following mass percentages:
alloy powder A: 2.3% of Ni powder, 17% of Cr powder, 0.25% of C powder, 2.5% of Co powder and the balance of Fe powder, wherein the purity of each component is more than 99.9%;
alloy powder B: 2.3% of Ni powder, 17% of Cr powder, 0.25% of C powder, 2.5% of Co powder, 20% of WC powder and the balance of Fe powder, wherein the purity of each component is more than 99.9%;
(3) fixing the lining plate to be strengthened on a platform of a numerical control laser processing machine tool by taking a 45-steel lining plate as the lining plate to be strengthened, and flatly paving the rectangular grating on the working surface of the lining plate to be strengthened to enable the working surface of the lining plate to be strengthened to fall within the range of the grating; uniformly spraying alloy powder A on the surface of the grid through an electrostatic powder sprayer, filling the grid with the alloy powder A, namely, the thickness of the alloy powder A is flush with the height of a grid groove of the grid, removing the grid, and collecting the residual alloy powder A on the grid; suspending the grid at the position of the grid when the alloy powder A is filled, translating the grid along the direction vertical to grid bars of the grid by the distance equal to the width of the grid groove, raising the side edge of the grid by 1.5mm to enable the thickness of the bottom of the grid groove of the grid to be the same as that of the alloy powder A, filling the alloy powder B into the grid groove by adopting an electrostatic powder sprayer until the height of the alloy powder B is flush with the bottom of the grid groove, removing the grid, and collecting the residual alloy powder B on the grid to obtain an alloy powder layer;
(4) carrying out laser cladding on the alloy powder layer to obtain a strengthened coating on the working surface of the lining plate, namely the wear-resistant lining plate, wherein the laser cladding process parameters are as follows: the laser power is 3.8kW, the rectangular light spot is 2X 14mm, the lap joint rate is 30%, and the scanning speed is 500 mm/min.
The composition of the 45 steel liner used in this example is shown in table 1:
composition of steel lining plate for watch 145
| C | Si | Mn | Cr | Ni | Cu |
| 0.42-0.50％ | 0.17-0.37％ | 0.50-0.80％ | ≤0.25％ | ≤0.25％ | ≤0.30％ |
Preparing 4 wear-resistant lining plates according to the operation, respectively marking as a sample 1, a sample 2, a sample 3 and a sample 4, uniformly spreading and flattening all sample strengthening coatings, wherein the thickness of a cladding layer is 1 mm; obtaining a smooth and stain-free reinforced coating surface after surface polishing treatment; and carrying out penetration flaw detection on the test sample by using the flaw detection agent, wherein the reinforced coating of all the test samples has no crack.
Hardness of the strengthening coating and that of the substrate 45 steel were measured using a bench scale hardness tester, and the results are shown in table 2.
TABLE 2 hardness of the strengthening coatings and substrates in samples 1-4
| Group of | Alloy powder A cladding area | Alloy powder B cladding area | Base material |
| Sample No. 1 | HRC54 | HRC58 | HRC28 |
| Sample No. 2 | HRC55 | HRC60 | HRC32 |
| Sample No. 3 | HRC54 | HRC59 | HRC29 |
| Sample No. 4 | HRC55 | HRC61 | HRC31 |
| Mean value of | HRC54.5 | HRC59.5 | HRC30 |
Table 2 shows that the average hardness of the alloy powder a cladding region in the obtained strengthened coating is HRC54.5, the average hardness of the alloy powder B cladding region is HRC59.5, no WC is present in the alloy powder a, and the average hardness of the alloy powder a cladding region is lower than that of the alloy powder B cladding region, but is higher than that of the matrix, and is 2 times that of the matrix, which indicates that the strengthened coating significantly improves the wear resistance of the matrix lining plate. In addition, the hardness of the obtained samples is not greatly different after the sample is repeated for 4 times, which shows that the method provided by the invention has good repeatability.
The morphology of the reinforced coatings of samples 1-4 was observed, and as shown in fig. 2, the reinforced coating practical diagram of sample 1 is shown, and the coating surface has no defects such as inclusions and cracks.
The service lives of the wear-resistant lining plates obtained by the test samples 1-4 and the 45 steel lining plate base body are tested, and the service lives of the wear-resistant lining plates obtained by the test samples 1-4 are respectively 150 days, 165 days and 158 days, 172 days and 35 days, so that the service life of the 45 steel lining plate base body can be more than 4 times that of the traditional 45 steel lining plate in the actual use process, wherein the service life of the wear-resistant lining plate provided by the invention can not meet the standard that the service needs are service life termination.
Example 2
(1) Selecting a rectangular thin steel plate with the thickness of 1.0mm, and processing uniformly distributed rectangular grids on the surface of the rectangular thin steel plate by a laser cutting method, wherein as shown in figure 1, the width of grid bars is 0.4mm, the width of grid grooves is 0.4mm, the grids can cover the working surface of a lining plate to be reinforced, and the length of the grid grooves of the grids is not less than the length of the surface of a device to be reinforced;
(2) preparing alloy powder A and alloy powder B according to the following mass percentages:
alloy powder A: 2.5% of Ni powder, 15% of Cr powder, 0.25% of C powder, 3.5% of Co powder and the balance of Fe powder, wherein the purity of each component is more than 99.9%;
alloy powder B: 2.5% of Ni powder, 15% of Cr powder, 0.25% of C powder, 3.5% of Co powder, 25% of WC powder and the balance of Fe powder, wherein the purity of each component is more than 99.9%;
(3) fixing the lining plate to be strengthened on a platform of a numerical control laser processing machine tool by taking a 45-steel lining plate as the lining plate to be strengthened, and flatly paving the rectangular grating on the working surface of the lining plate to be strengthened to enable the working surface of the lining plate to be strengthened to fall within the range of the grating; uniformly spraying alloy powder A on the surface of the grid through an electrostatic powder sprayer, filling the grid with the alloy powder A, namely, the thickness of the alloy powder A is flush with the height of a grid groove of the grid, removing the grid, and collecting the residual alloy powder A on the grid; suspending the grid at the position of the grid when the alloy powder A is filled, translating the grid along the direction vertical to grid bars of the grid by the distance equal to the width of the grid groove, raising the side edge of the grid by 1mm to enable the bottom of the grid groove of the grid to be the same as the thickness of the alloy powder A, filling the alloy powder B into the grid groove by adopting an electrostatic powder sprayer until the height of the alloy powder B is flush with the bottom of the grid groove, removing the grid, and collecting the residual alloy powder B on the grid to obtain an alloy powder layer;
(4) carrying out laser cladding on the alloy powder layer to obtain a strengthened coating on the working surface of the lining plate, namely the wear-resistant lining plate, wherein the laser cladding process parameters are as follows: the laser power is 4.0kW, the rectangular light spot is 2X 14mm, the lap joint rate is 30%, and the scanning speed is 650 mm/min.
The hardness of the reinforced coating obtained in this example was measured according to the test method in example 1, and the results are shown in Table 3.
TABLE 3 hardness of the reinforced coating obtained in this example
| Alloy powder A cladding area | Alloy powder B cladding area | Base material |
| HRC53 | HRC59.5 | HRC27 |
The reinforced coating obtained in the embodiment is uniformly and flatly spread, and the thickness of the cladding layer is 0.5 mm; obtaining a smooth and stain-free reinforced coating surface after surface polishing treatment; and carrying out penetration flaw detection on the test sample by using the flaw detection agent, wherein the reinforced coating of all the test samples has no crack. The morphology of the reinforced coating obtained in the embodiment is observed, and the surface of the coating has no defects such as inclusions, cracks and the like.
The service life of the reinforced coating obtained in the embodiment is tested, so that in the actual use process, the lining plate cannot meet the standard that the service requirement is the service life termination, the result is 171 days, and the service life of the wear-resistant lining plate provided by the invention reaches more than 4.5 times of that of the traditional 45 steel lining plate.
Example 3
(1) Selecting a rectangular thin steel plate with the thickness of 2.0mm, and processing uniformly distributed rectangular grids on the surface of the rectangular thin steel plate by a laser cutting method, wherein as shown in figure 1, the width of grid bars is 0.6mm, the width of grid grooves is 0.6mm, the grids can cover the working surface of a lining plate to be reinforced, and the length of the grid grooves of the grids is not less than the length of the surface of a device to be reinforced;
(2) preparing alloy powder A and alloy powder B according to the following mass percentages:
alloy powder A: 3.5% of Ni powder, 18% of Cr powder, 0.25% of C powder, 3.5% of Co powder and the balance of Fe powder, wherein the purity of each component is more than 99.9%;
alloy powder B: 3.5% of Ni powder, 18% of Cr powder, 0.25% of C powder, 3.5% of Co powder, 20% of WC powder and the balance of Fe powder, wherein the purity of each component is more than 99.9%;
(3) fixing the lining plate to be strengthened on a platform of a numerical control laser processing machine tool by taking a 45-steel lining plate as the lining plate to be strengthened, and flatly paving the rectangular grating on the working surface of the lining plate to be strengthened to enable the working surface of the lining plate to be strengthened to fall within the range of the grating; uniformly spraying alloy powder A on the surface of the grid through an electrostatic powder sprayer, filling the grid with the alloy powder A, namely, the thickness of the alloy powder A is flush with the height of a grid groove of the grid, removing the grid, and collecting the residual alloy powder A on the grid; suspending the grid at the position of the grid when the alloy powder A is filled, translating the grid along the direction vertical to grid bars of the grid by the distance equal to the width of the grid groove, raising the side edge of the grid by 2mm to enable the bottom of the grid groove of the grid to be the same as the thickness of the alloy powder A, filling the alloy powder B into the grid groove by adopting an electrostatic powder sprayer until the height of the alloy powder B is flush with the bottom of the grid groove, removing the grid, and collecting the residual alloy powder B on the grid to obtain an alloy powder layer;
(4) carrying out laser cladding on the alloy powder layer to obtain a strengthened coating on the working surface of the lining plate, namely the wear-resistant lining plate, wherein the laser cladding process parameters are as follows: the laser power is 3.9kW, the rectangular light spot is 2X 14mm, the lap joint rate is 50%, and the scanning speed is 630 mm/min.
The hardness of the reinforced coating obtained in this example was measured according to the test method in example 1, and the results are shown in Table 4.
TABLE 4 hardness of the strengthening coating obtained in this example
| Alloy powder A cladding area | Alloy powder B cladding area | Base material |
| HRC54.5 | HRC59.3 | HRC28.5 |
The reinforced coating obtained in the embodiment is uniformly and flatly spread, and the thickness of the cladding layer is 1.5 mm; obtaining a smooth and stain-free reinforced coating surface after surface polishing treatment; and carrying out penetration flaw detection on the test sample by using the flaw detection agent, wherein the reinforced coating of all the test samples has no crack. The morphology of the reinforced coating obtained in the embodiment is observed, and the surface of the coating has no defects such as inclusions, cracks and the like.
The service life of the reinforced coating obtained in the embodiment is tested, so that in the actual use process, the lining plate cannot meet the standard that the working requirement is the service life termination, the result is 168 days, and the service life of the wear-resistant lining plate provided by the invention is 4.8 times that of the traditional 45 steel lining plate.
Comparative example 1
(1) Preparing alloy powder A according to the following mass percent
Alloy powder A: 3.5% of Ni powder, 18% of Cr powder, 0.25% of C powder, 3.5% of Co powder and the balance of Fe powder, wherein the purity of each component is more than 99.9%;
(2) fixing the lining plate to be strengthened on a numerical control laser processing machine tool platform by taking a 45-steel lining plate as the lining plate to be strengthened, uniformly spraying alloy powder A on the surface of the grating by using an electrostatic powder sprayer, and presetting the thickness of the powder A to be 2.0 mm;
(4) carrying out laser cladding on the alloy powder layer to obtain a strengthened coating on the working surface of the lining plate, namely the wear-resistant lining plate, wherein the laser cladding process parameters are as follows: the laser power is 3.9kW, the rectangular light spot is 2X 14mm, the lap joint rate is 50%, and the scanning speed is 630 mm/min.
The hardness of the A alloy powder reinforced coating obtained in this example was measured according to the test method in example 1, and the results are shown in Table 5.
TABLE 5 hardness of the reinforced coating obtained in this comparative example
| Alloy powder A cladding area | Base material |
| HRC55.3 | HRC28.2 |
The appearance of the reinforced coating obtained by the comparative example is observed, and the surface of the coating has no defects such as inclusion, cracks and the like.
The service life of the reinforced coating obtained in the comparative example is tested, and the lining plate can not meet the standard that the service requirement is the service life termination in the actual use process, so that the service life is 81 days, which is half shorter than that of the reinforced coatings obtained in the examples 1-3.
Comparative example 2
(1) Preparing alloy powder B according to the following mass percent
Alloy powder B: 3.5% of Ni powder, 18% of Cr powder, 0.25% of C powder, 3.5% of Co powder, 20% of WC powder and the balance of Fe powder, wherein the purity of each component is more than 99.9%;
(2) fixing the lining plate to be strengthened on a numerical control laser processing machine tool platform by taking a 45-steel lining plate as the lining plate to be strengthened, uniformly spraying alloy powder B on the surface of the grating by using an electrostatic powder sprayer, and presetting the thickness of the powder B to be 2.0 mm;
(4) carrying out laser cladding on the alloy powder layer to obtain a strengthened coating on the working surface of the lining plate, namely the wear-resistant lining plate, wherein the laser cladding process parameters are as follows: the laser power is 3.9kW, the rectangular light spot is 2X 14mm, the lap joint rate is 50%, and the scanning speed is 630 mm/min.
The hardness of the B alloy powder reinforced coating obtained in this example was measured according to the test method in example 1, and the results are shown in Table 6.
TABLE 6 hardness of the reinforced coating obtained in this comparative example
| Alloy powder B cladding area | Base material |
| HRC60.3 | HRC27.8 |
The appearance of the reinforced coating obtained by the comparative example is observed, and the surface of the coating has no defects such as inclusion, cracks and the like.
The service life of the reinforced coating obtained in the comparative example is tested, and in the actual use process, the lining plate cannot meet the standard that the service life is required to be the service life end, the result is 187 days, and the service life of the reinforced coating is only 9-31 days longer than that of the reinforced coatings obtained in examples 1-3, namely, compared with the coating formed by completely using the alloy powder B, the service life of the coating provided by the invention is only reduced by 8-20%, but the using amount of WC is reduced by about 50%, the precious metal W is saved, and the higher cost performance is realized.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A grid type wear-resistant reinforced coating is characterized by being prepared by the following method:
presetting alloy powder A and alloy powder B on the surface of a device to be strengthened, wherein the alloy powder A and the alloy powder B are alternately distributed in a strip shape in the obtained alloy powder layer, and then carrying out laser cladding to obtain a grid type wear-resistant strengthened coating;
the alloy powder A comprises the following components in percentage by mass: 2.2-3.2% of Ni powder, 15-18% of Cr powder, 0.25-0.35% of C powder, 2.0-3.5% of Co powder and the balance of Fe powder;
the alloy powder B comprises the following components in percentage by mass: 2.2-3.2% of Ni powder, 15-18% of Cr powder, 0.25-0.35% of C powder, 2.0-3.5% of Co powder, 10-25% of WC powder and the balance of Fe powder.
2. The grated wear-resistant reinforced coating according to claim 1, wherein the alloy powder A and the alloy powder B independently have a particle size of 135-325 mesh.
3. The grated wear-resistant reinforced coating of claim 1, wherein the laser cladding parameters are: the laser power is 3.8-4.0 kW, the rectangular light spot is 2 multiplied by 14mm, the lap joint rate is 30-50%, and the scanning speed is 500-650 mm/min.
4. The grid type wear-resistant strengthening coating as claimed in claim 1 or 2, wherein the alloy powder layer has a strip shape formed by alloy powder A and alloy powder B, and the strip shape has a width of 0.4-0.6 mm.
5. The preparation method of the grid type wear-resistant reinforced coating as claimed in any one of claims 1 to 4, which is characterized by comprising the following steps:
providing a grating capable of covering the surface of a device to be strengthened, wherein the width of a grating groove of the grating is the same as that of a grating strip, and the length of the grating groove of the grating is not less than that of the surface of the device to be strengthened;
placing the grid on the surface of a device to be reinforced, filling alloy powder A into the grid groove until the height of the alloy powder A is flush with that of the grid groove, then translating the grid along the direction vertical to grid bars of the grid, and providing support below the grid to enable the bottom of the grid groove of the grid to be the same as the thickness of the alloy powder A, and the translation distance of the grid to be the same as the width of the grid groove; then, alloy powder B is filled into the grid groove until the height of the alloy powder B is flush with the bottom of the grid groove, and an alloy powder layer is obtained;
and carrying out laser cladding on the alloy powder layer to obtain the grid type wear-resistant reinforced coating.
6. The production method according to claim 5, wherein the alloy powder A and the alloy powder B are filled using an electrostatic powder blower.
7. The method of claim 5, wherein the grid is produced by a laser cutting method.
8. The wear-resistant lining plate is characterized by comprising a lining plate base body and a strengthening coating, wherein the strengthening coating is the grid type wear-resistant strengthening coating in any one of claims 1 to 4 or the grid type wear-resistant strengthening coating obtained by the preparation method in any one of claims 5 to 7, and the strengthening coating and the lining plate base body are metallurgically bonded.
9. The wear-resistant lining board according to claim 8, wherein the thickness of the strengthening coating is 0.5-2.0 mm.
10. The method for preparing the wear-resistant lining plate as claimed in any one of claims 8 to 9, which is characterized by comprising the following steps:
the preparation method according to any one of claims 5 to 7, wherein a strengthening coating is prepared on the surface of the lining plate substrate to obtain the wear-resistant lining plate.
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Application publication date: 20190917 Assignee: Yantai Nuclear Power Intelligent Technology Research Institute Co.,Ltd. Assignor: Yantai Zhongxin Interconnection Energy Technology Co.,Ltd. Contract record no.: X2023980052343 Denomination of invention: A grid type wear-resistant strengthening coating, wear-resistant lining plate using the coating, and their preparation method Granted publication date: 20200428 License type: Exclusive License Record date: 20231222 |