CN117753966A - Laser cladding powder of cast steel material and preparation method thereof - Google Patents
Laser cladding powder of cast steel material and preparation method thereof Download PDFInfo
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- CN117753966A CN117753966A CN202311762764.XA CN202311762764A CN117753966A CN 117753966 A CN117753966 A CN 117753966A CN 202311762764 A CN202311762764 A CN 202311762764A CN 117753966 A CN117753966 A CN 117753966A
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- 239000000843 powder Substances 0.000 title claims abstract description 92
- 238000004372 laser cladding Methods 0.000 title claims abstract description 77
- 229910001208 Crucible steel Inorganic materials 0.000 title claims abstract description 26
- 239000000463 material Substances 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title abstract description 22
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 4
- 230000004927 fusion Effects 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 4
- 229910001566 austenite Inorganic materials 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229910000734 martensite Inorganic materials 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract description 19
- 230000007797 corrosion Effects 0.000 abstract description 19
- 238000005299 abrasion Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 238000007373 indentation Methods 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000005253 cladding Methods 0.000 description 40
- 230000000052 comparative effect Effects 0.000 description 30
- 239000011159 matrix material Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 12
- 238000012876 topography Methods 0.000 description 12
- 230000008439 repair process Effects 0.000 description 10
- 239000000758 substrate Substances 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 239000000956 alloy Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 229910052761 rare earth metal Inorganic materials 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010790 dilution Methods 0.000 description 3
- 239000012895 dilution Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 239000010953 base metal Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009689 gas atomisation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011165 process development Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910001256 stainless steel alloy Inorganic materials 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
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- Laser Beam Processing (AREA)
Abstract
The invention relates to cast steel material laser cladding powder and a preparation method thereof. The laser cladding powder consists of the following components: cr:16.0 to 18.0wt percent, ni:10.0 to 14.0wt percent, mo:2.0 to 3.0wt%, mn:0.30-1.00wt%, si:0.35-1.00wt%, C:0.005-0.03wt%, S:0.005-0.03wt%, P:0.005-0.03wt%, Y 2 O 3 ：1.5‑2.5wt％，The balance being Fe. The laser cladding powder disclosed by the invention is mainly used for repairing defects such as indentation, corrosion and the like of the cast steel axle box body part made of the G20Mn5QT material, can improve the abrasion resistance, corrosion resistance and fatigue resistance of a damaged surface of the cast steel axle box body, solves the current situation of 'repairing with replacement', reduces the maintenance cost of a motor train unit and improves the use efficiency of the cast steel axle box body part made of the G20Mn5QT material.
Description
Technical Field
The invention relates to alloy materials, in particular to cast steel material laser cladding powder and a preparation method thereof.
Background
The cast steel axle box G20Mn5QT material for the high-speed motor train unit has excellent toughness, is widely applied to key components such as axle boxes of rail vehicles, and has important roles on the reliability and safety of trains. In order to solve the problem that the cast steel axle box body is scrapped due to surface rust and excessive abrasion, the selected laser cladding method needs a powder material which has the advantages of low dilution rate, good interface combination, wear resistance and corrosion resistance equivalent to a base metal, good impact property, good fatigue property and good quality uniformity, so as to meet the laser cladding quality requirement of the axle box body.
Disclosure of Invention
The invention provides laser cladding powder for solving the problem of damaged surfaces of axle box bodies of high-speed motor train units and a preparation method thereof. The laser cladding powder is mainly used for repairing defects such as indentation, corrosion and the like of the cast steel axle box body part made of the G20Mn5QT material, can improve the abrasion resistance, corrosion resistance and fatigue resistance of a damaged surface of the cast steel axle box body, solves the current situation of 'repairing with replacement', reduces the maintenance cost of a motor train unit and improves the use efficiency of the cast steel axle box body part made of the G20Mn5QT material.
The laser cladding powder comprises the following components in percentage by mass: cr:16.0 to 18.0wt percent, ni:10.0 to 14.0wt percent, mo:2.0 to 3.0wt%, mn:0.30-1.00wt%, si:0.35-1.00wt%, C:0.005-0.03wt%, S:0.005-0.03wt%, P:0.005-0.03wt%, Y 2 O 3 :1.5-2.5wt% and the balance of Fe.
According to the embodiment of the invention, the laser cladding powder comprises the following components in percentage by mass: cr:17.24wt%, ni:10.92wt%, mo:2.54wt%, mn:0.93wt%, si:0.72wt%, C:0.01wt%, S:0.03wt%, P:0.01wt%, Y 2 O 3 :1.5-2.5wt% and the balance of Fe.
The effect of each element in the laser cladding powder in the cladding layer is as follows: the strength of the cladding layer is improved by the element C; the Si element improves the acid resistance; mo can strengthen the matrix, improve the high-temperature strength and creep property of the material, form a passivation film and improve the corrosion resistance; mn element can improve high temperature resistance; the P element improves the strength and hardness of the material; the Ni element improves the plasticity and toughness of the cladding layer and improves the corrosion resistance; cr element improves cladding corrosion resistance and forms a surface passivation film; rare earth Y 2 O 3 Plays a role of refining grains and improves the overall performance of the cladding layer. The powder has reasonable matching of elements and gives consideration to the strength, hardness, toughness, corrosion resistance and wear resistance of the cladding layer.
The laser cladding powder has high melting point, smaller particle size and more diffuse tissue; after laser cladding forming, the structure has austenite, martensite, fe-Cr phase and a small amount of SiC hard phase, and the existence of rare earth elements further refines the structure grains, so that the repairing layer has unique properties of toughness, wear resistance and corrosion resistance. The cladding powder has smaller particle size and higher melting point, ensures stronger combination with a matrix and ensures that the dilution rate is lower than 5 percent.
Further studies have found that if Y in the laser cladding powder of the invention 2 O 3 The content is lower than 1.5 weight percent, so that the nucleation rate in a molten pool is low, the grain refinement effect on the molten pool is not obvious, and the influence on the mechanical property of a cladding layer is small; if Y 2 O 3 When the content is higher than 2.5wt%, a large amount of insoluble matters are formed in the molten pool, so that the fluidity of the molten pool is reduced, grains become coarse, and the mechanical property of the cladding layer is reduced. When Y is 2 O 3 When the content is in the range of 1.5-2.5wt%, the amorphous silicon carbide material can react with impurities in a molten pool to form fine compounds to form cores of heterogeneous crystal nuclei, so that the nucleation rate is improved, grains are refined, and the mechanical property of a cladding layer is improved.
According to an embodiment of the present invention, in the laser cladding powder, Y 2 O 3 The content is 1.5wt%, 2wt% or 2.5wt%.
In some embodiments, the Hall flow rate of the laser cladding powder is 17-18s/50g, such as 17.80s/50g. The detection can be performed by referring to the standard GB/T19077 method.
According to the embodiment of the invention, the granularity of the laser cladding powder is 60-95 mu m. The research shows that the cladding powder has smaller particle size and higher melting point, ensures stronger combination with a matrix and ensures that the dilution rate is lower than 5 percent.
According to an embodiment of the present invention, the laser cladding powder has austenite, martensite, fe-Cr phase, and SiC hard phase.
The invention also provides a preparation method of the laser cladding powder, which comprises the following steps: mixing the elements according to a formula; under the action of high-temperature high-pressure gas, carrying out reaction and fusion; grinding and screening to obtain qualified powder; and (5) heat treatment.
According to an embodiment of the invention, the elevated temperature is 180-220 ℃, e.g. 200 ℃.
According to an embodiment of the invention, the high pressure is 3.0-5.0Mpa, for example 3.5Mpa.
According to an embodiment of the invention, the gas is an inert gas, such as argon.
According to the embodiment of the invention, the reaction and fusion can be performed in a medium-frequency induction furnace.
According to the embodiment of the invention, the vacuum degree of the heat treatment is 0.1-1Pa (e.g. 0.2 Pa), the temperature of the heat treatment is 850-950 ℃ (e.g. 900 ℃), and the heat treatment time is 0.5-2h (e.g. 1 h). The heat treatment aims to fully diffuse alloy elements in the raw material powder, and the metastable phase is completely converted into a stable phase, so that the uniformity and the controllability of the powder components are ensured.
The invention is prepared by adopting a gas physical and chemical method, so that the powder is more uniformly mixed, and the particle sizes are more consistent. The preparation method of the invention not only can greatly save the preparation time of the powder, but also can improve the qualification rate of the prepared powder, and further reduces the preparation cost of the powder.
According to an embodiment of the invention, the laser cladding powder appears grey in appearance, dry and visually free of visible inclusions.
The laser cladding powder may be dried prior to use. For example, the stainless steel alloy powder is subjected to a drying treatment of 100 ℃ x 2 hours by using a vacuum drying oven before laser cladding.
The invention also provides application of the laser cladding powder in repairing cast steel materials.
The laser cladding powder is suitable for laser cladding repair (laser cladding technology) of axle box bodies. The repair substrate may be carbon steel, particularly suitable for repairing cast steel G20Mn5QT substrates. The cast steel axle box G20Mn5QT material for repairing the high-speed motor train unit is specifically used.
Conventional laser cladding methods in the art may be employed.
Alloy compositions and corresponding room temperature mechanical properties of the cast steel G20Mn5QT substrate are shown in Table 1.
TABLE 1 chemical composition and mechanical Properties of cast Steel G20Mn5QT substrate
The laser cladding powder is spherical powder containing rare earth elements Y, and can deposit a stainless steel coating with good wear resistance and corrosion resistance on a friction surface or a contact surface of low alloy steel of the axle box body so as to improve the wear resistance and corrosion resistance of the axle box body and prolong the service life of the axle box body.
Drawings
FIG. 1 is a schematic diagram of a process for preparing a laser cladding powder according to an embodiment of the present invention.
Figure 2 example 1 SEM topography of laser cladding powder.
FIG. 3 is a morphology chart of the stainless steel clad layer OM (optical microscope) of example 1 and comparative examples 1 to 5.
FIG. 4 is a chart showing the OM topography of the cladding coating-substrate bonding interface of example 1.
FIG. 5 is a graph showing the OM topography of the salt spray corrosion of the cladding coating and the substrate of example 1.
And (3) an OM morphology diagram of the cast steel matrix G20Mn5QT is shown in fig. 6.
FIG. 7 is an OM topography of the cladding layer of example 1.
FIG. 8 is a graph of OM topography of the cladding layer of comparative example 1.
FIG. 9 is a graph of OM topography of the cladding layer of comparative example 2.
FIG. 10 is a graph of OM topography of the cladding layer of comparative example 3.
FIG. 11 is a graph of OM topography of the cladding layer of comparative example 4.
FIG. 12 is a graph of OM topography of the cladding layer of comparative example 5.
And (3) SEM morphology of a cast steel matrix G20Mn5QT fatigue fracture.
FIG. 14 is an SEM topography of a cladding layer fatigue fracture of example 1.
Detailed Description
The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
The schematic flow chart of the preparation process of the laser cladding powder in the embodiment of the invention is shown in fig. 1. As shown in fig. 1, the powder gas-liquid interaction crushing process and the gas atomization pulverizing process in the pulverizing process are simulated by a numerical simulation method to find out the optimal powder preparation process. The method has the advantages that the optimal powder preparation process can be quickly found, and the process development cost of powder preparation is greatly reduced. And analyzing the simulation result, and preparing the powder material object by using the process after the obtained powder meets the related technical indexes. Firstly, preparing all elements of the powder according to an optimal proportion, adding the powder into a smelting furnace, and fully reacting and fusing the powder under the action of high-temperature and high-pressure gas. After smelting, grinding and screening the collected powder to obtain qualified powder. And then carrying out heat treatment on the powder to reach the heat treatment state required by the powder before laser cladding. Finally, checking and comparing various indexes such as physical and chemical properties of the powder, and sealing and packaging for later use if the use requirement is met.
Example 1
The embodiment provides laser cladding powder which comprises the following components in percentage by mass: cr:17.24wt%, ni:10.92wt%, mo:2.54wt%, mn:0.93wt%, si:0.72wt%, C:0.01wt%, S:0.03wt%, P:0.01wt%, Y 2 O 3 :2wt% and the balance of Fe.
The preparation method of the laser cladding powder comprises the following steps: mixing the elements according to a formula; under the action of argon at 200 ℃ and 3.5Mpa, carrying out reaction and fusion; grinding and screening to obtain qualified powder; heat treatment is carried out for 1h under the conditions of vacuum degree of 0.2Pa and temperature of 900 ℃.
The particle size of the laser cladding powder of this example was 60-95. Mu.m.
The laser cladding powder of this example was used for laser cladding repair. Setting the spot diameter of 4mm, the focal length of 11.6mm, the laser power of 2300W, the laser scanning speed of 500mm/min, the powder feeding rate of 14G/min and the powder feeding air flow of 7L/min on a G20Mn5QT cast steel substrate, and obtaining the stainless steel cladding layer after laser cladding.
Example 2
The embodiment provides laser cladding powder which comprises the following components in percentage by mass: cr:17.24wt%, ni:10.92wt%, mo:2.54wt%, mn:0.93wt%, si:0.72wt%, C:0.01wt%, S:0.03wt%, P:0.01wt%, Y 2 O 3 :1.5wt% and the balance of Fe.
The preparation method is the same as in example 1.
The laser cladding powder of this example was used for laser cladding repair in the same manner as in example 1.
Example 3
The embodiment provides laser cladding powder which comprises the following components in percentage by mass: cr:17.24wt%, ni:10.92wt%, mo:2.54wt%, mn:0.93wt%, si:0.72wt%, C:0.01wt%, S:0.03wt%, P:0.01wt%, Y 2 O 3 :2.5wt% and the balance being Fe.
The preparation method is the same as in example 1.
The laser cladding powder of this example was used for laser cladding repair in the same manner as in example 1.
Comparative example 1
This comparative example provides a laser cladding powder differing from example 1 only in that: y is Y 2 O 3 The content of (C) was 0.5% by weight. The preparation method is the same as in example 1.
The laser cladding repair was performed using the laser cladding powder of this comparative example in the same manner as in example 1.
Comparative example 2
This comparative example provides a laser cladding powder differing from example 1 only in that: y is Y 2 O 3 The content of (2) was 1% by weight. The preparation method is the same as in example 1.
The laser cladding repair was performed using the laser cladding powder of this comparative example in the same manner as in example 1.
Comparative example 3
This comparative example provides a laser cladding powder differing from example 1 only in that: y is Y 2 O 3 The content of (2) was 3% by weight. The preparation method is the same as in example 1.
The laser cladding repair was performed using the laser cladding powder of this comparative example in the same manner as in example 1.
Comparative example 4
This comparative example provides a laser cladding powder differing from example 1 only in that: y is set to 2 O 3 Replacement with Al; the Al content was 2wt%. The preparation method is the same as in example 1.
The laser cladding repair was performed using the laser cladding powder of this comparative example in the same manner as in example 1.
Comparative example 5
This comparative example provides a laser cladding powder differing from example 1 only in the preparation method: y is set to 2 O 3 Replaced with Ti; the Ti content was 2wt%. The preparation method is the same as in example 1.
The laser cladding repair was performed using the laser cladding powder of this comparative example in the same manner as in example 1.
Experimental example
Example 1 laser cladding powder SEM morphology is shown in figure 2.
The morphology (golden phase) of the stainless steel cladding layer OM (optical microscope) of example 1 and comparative examples 1-5 is shown in FIG. 3.
As can be seen from FIG. 3, the stainless steel cladding layers of example 1 and comparative examples 1 to 5 were flat and crack-free.
Example 1 a map of the OM morphology of the cladding coating and substrate bonding interface is shown in fig. 4.
As can be seen from FIG. 4, the cladding layer of example 1 has good bonding with the substrate interface, and the shear strength can reach 520Mpa.
The pattern of the salt spray corrosion OM of the cladding coating and the matrix in example 1 is shown in FIG. 5. As can be seen from FIG. 5, the cladding layers of example 1 are each more corrosion resistant than the substrate by the salt spray corrosion test.
The OM morphology diagram of the cast steel matrix G20Mn5QT is shown in FIG. 6.
The OM topography of the cladding layers of example 1 and comparative examples 1-5 are shown in FIGS. 7-12.
By comparing the metallographic phase of the base material with the metallographic phase of the cladding layers of the example 1 and the comparative examples 1-5, the base material is cast steel G20Mn5QT, and the metallographic phase (figure 6) is coarser.
Example 1 cladding layer metallographic (fig. 7) had finer grains; comparative example 1, Y 2 O 3 Lower content, poor surface formation (fig. 8); comparative example 2, Y 2 O 3 The content was 1%, the molding was poor, and voids were present (fig. 9); comparative example 3, following Y 2 O 3 The increase in the content caused the metallographic grains of the cladding layer to grow up relative to those of example 1 (FIG. 10); in comparative examples 4 and 5, grain growth was more pronounced after element replacement (fig. 11 and 12).
As can be seen from the mechanical property test results, the cladding layers of example 1 and comparative examples 1 to 5 have better low-temperature impact toughness (-40 ℃) and abrasion resistance than the matrix material. However, the cladding layer had better tensile strength, yield strength and microhardness than the matrix only under the alloy composition and process conditions of example 1. Therefore, the mechanical properties are best under the powder composition and process conditions of example 1.
TABLE 2 comparison of mechanical Properties
The fatigue performance test was conducted by cladding the base material with the composition and process of example 1, to obtain a base material with a fatigue limit of 320MPa and a cladding layer with a fatigue limit of 310MPa. The fatigue limit of the alloy is close to that of the base metal, and the use requirement can be met.
SEM morphology of cast steel matrix G20Mn5QT fatigue fracture is shown in FIG. 13. Example 1 SEM topography of the cladding layer fatigue fracture is shown in fig. 14. By analyzing the matrix fatigue fracture (fig. 13), fatigue cracks are mainly caused by defects during casting. By analyzing the fatigue fracture of the cladding layer (fig. 14), fatigue cracks were mainly caused by the cladding layer pores.
By comparing and analyzing the technological properties, mechanical properties, corrosion properties and fatigue properties of the matrix and related examples, the alloy composition and the technological conditions in the example 1 can melt and coat a cladding layer with high bonding strength, good comprehensive mechanical properties, excellent corrosion resistance and close fatigue strength on the surface of the matrix material through a laser cladding process. Meets the requirement of repairing the indentation and the rust of the cast steel axle box body part made of the G20Mn5QT material.
In a word, the laser cladding powder is spherical powder and austenitic stainless steel, the components take chromium and nickel elements as main components, iron is taken as matrix components, and the interaction of the chromium and nickel elements plays a role in improving the wear resistance and corrosion resistance through smelting, atomizing and forming, and rare earth element Y 2 O 3 The structure grains are thinned, and the toughness of the cladding layer is improved.
While the invention has been described in detail in the foregoing general description and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (10)
1. The laser cladding powder is characterized by comprising the following components in percentage by mass: cr:16.0 to 18.0wt percent, ni:10.0 to 14.0wt percent, mo:2.0 to 3.0wt%, mn:0.30-1.00wt%, si:0.35-1.00wt%, C:0.005-0.03wt%, S:0.005-0.03wt%, P:0.005-0.03wt%, Y 2 O 3 :1.5-2.5wt% and the balance of Fe.
2. The laser cladding powder according to claim 1, wherein, in mass percent,the composition comprises the following components: cr:17.24wt%, ni:10.92wt%, mo:2.54wt%, mn:0.93wt%, si:0.72wt%, C:0.01wt%, S:0.03wt%, P:0.01wt%, Y 2 O 3 :1.5-2.5wt% and the balance of Fe.
3. The laser cladding powder according to claim 1, wherein in the laser cladding powder, Y 2 O 3 The content is 1.5wt%, 2wt% or 2.5wt%.
4. A laser cladding powder according to any one of claims 1-3, wherein the hall flow rate of the laser cladding powder is 17-18s/50g; optionally 17.80s/50g.
5. The laser cladding powder according to any one of claims 1-4, wherein the particle size of the laser cladding powder is 60-95 μm.
6. The laser cladding powder according to any one of claims 1-5, wherein the laser cladding powder has austenite, martensite, fe-Cr phase, and SiC hard phase.
7. A method for producing the laser cladding powder according to any one of claims 1 to 6, comprising:
mixing the elements according to a formula; under the action of high-temperature high-pressure gas, carrying out reaction and fusion;
grinding and screening to obtain qualified powder;
and (5) heat treatment.
8. The method for producing a laser cladding powder according to claim 7,
the high temperature is 180-220 ℃; and/or the number of the groups of groups,
the high pressure is 3.0-5.0Mpa; and/or the number of the groups of groups,
the gas is inert gas; and/or the number of the groups of groups,
the vacuum degree of the heat treatment is 0.1-1Pa, the heat treatment temperature is 850-950 ℃, and the heat treatment time is 0.5-2h.
9. Use of the laser cladding powder of any one of claims 1-6 for repairing cast steel materials.
10. The use according to claim 9, characterized in that the cast steel material is G20Mn5QT.
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| CN202311762764.XA CN117753966A (en) | 2023-12-19 | 2023-12-19 | Laser cladding powder of cast steel material and preparation method thereof |
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