CN105088220A - Composite carbide and carbonitride alloy used for laser cladding - Google Patents
Composite carbide and carbonitride alloy used for laser cladding Download PDFInfo
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- CN105088220A CN105088220A CN201410204052.0A CN201410204052A CN105088220A CN 105088220 A CN105088220 A CN 105088220A CN 201410204052 A CN201410204052 A CN 201410204052A CN 105088220 A CN105088220 A CN 105088220A
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Abstract
The invention relates to a composite carbide and carbonitride alloy used for laser cladding, and belongs to the science and technology field of new and high-tech material processes. The alloy comprises, by mass percent, 15%-35% of Cr, 8%-50% of W, 2%-25% of Mo, 0.5%-3.0% of V, 0.5%-4.0% of Ti, 4%-20% of Ni, 1.0%-6.0% of C, 0.2%-1.5% of N, 1.0%-15% of Mn, not larger than 2.0% of Si, smaller than 0.03% of S, smaller than 0.03% of P and the balanced Fe. The alloy is prepared according to the component ratio of the alloy and is smelted and atomized into alloy powder. A preset part of a workpiece is covered with the prepared carbide and carbonitride alloy powder in advance. A laser head of a laser device is controlled to conduct laser scanning on the clad alloy powder covering the workpiece in advance on the surface of the workpiece according to a preset route. Under the conditions that the laser power ranges from 1.5 kW to 2.0 kW, the light spot diameter ranges from 4 mm to 5 mm and the scanning speed ranges from 10 mm/sec to 15 mm/sec, according to the cladding layer structure characteristic, MC type, M2C type, M6C type, M23C6 type and M7C3 type multi-element carbide and carbonitride are distributed on a gamma-phase matrix. No mesh-shaped carbide or mesh-shaped structures exist in a texture. The alloy is suitable for surface laser cladding of special tools with requirements for high abrasion resistance and high corrosion resistance.
Description
Technical field
This invention belongs to new high-tech material craft science technical field, particularly a kind of laser cladding anticorrosive wear-resistant high rigidity double carbide carbonitride alloys.
Background technology
Along with development in science and technology, all kinds of instrument, precision cutting tool, NC lathe special type knife, Rock cutting cutter and petroleum drilling instrument, except the cutter (blade) requiring direct cutting metal or rock, with the cutter head (drill bit) of superhard wear corrosion-resistant material outward, the importing of cutter hub, cutter, extension, have higher hardness, wear-resisting, anti-corrosion, to ensure the precision of cutting and processing, extend the work-ing life of precision cutting tool or drilling tool.For this reason, wish there is higher wear and corrosion behavior in region of interest.Used welding process in the past, and comprised TIG weldering, Plasma weldering or PTA weldering, though these methods can obtain good wear-and corrosion-resistant overlay cladding, because thermal source is not concentrated, heat affected zone is comparatively large, affects the performance of cutter hub, even the distortion of cutter hub.Carry out laser cladding (Lasercladding or Lasermelting) with the laser beam of high-energy-density, heat input can be reduced, obviously reduce heat affected zone, reduce workpiece deformation.But current available coating material, though hardness and the wear resistance that can ensure deposition floor height, after deposition often there is crackle in overlay.After seeking laser cladding, flawless the guarantee again of cladding layer meets the target that the anti-corrosion alloy material of laser cladding layers high hardness wear-resisting is the research and development of this field.
Summary of the invention
This patent application, have developed a kind of laser cladding anticorrosive wear-resistant high rigidity double carbide carbonitride alloys.The one-tenth of the double carbide carbonitride alloys of research and development is grouped into and ensures at power 1.5kW-2.0kW, under the laser cladding condition of hot spot 4-5mm, the microstructure of the overlay alloy obtained is: MC type, M2C type, M23C6 type, M7C3(M is metallic element, and C is carbon and/or nitrogen) double carbide, carbonitride be comparatively evenly distributed on γ phase matrix.Fig. 1, provides the metallographic microstructure photo of this kind of alloy of laser cladding.The total amount of carbide and carbonitride is in 40-75vol% (percent by volume).The macrohardness 50-65HRC of coating, wherein the microhardness of hard phase (alloy carbide, carbonitride) is at 1050-2100HV, higher than the hardness (500-850HV) of the hardened steel run under engineering specifications (700HV) or rock material, ensure that overlay has higher wear resistance.Alloy has higher chrome content and nickel content, thus ensures that this double carbide carbonitride alloys has good solidity to corrosion.
Separately, see from the metallographic structure of the laser cladding layers of such alloy, in tissue, easily do not cause the carbide network that cracks and reticulattion.Ensure that the laser cladding layers of this kind of alloy under laser cladding condition does not have crackle.
The composition of the laser cladding anticorrosive wear-resistant high rigidity double carbide carbonitride alloys of this application for (mass percent wt%) is: containing Cr:15-35wt%, W:8.0-50wt%, Mo:2.0-25wt%, V:0.5-3.0wt%, Ti:0.5-4.0wt%, Ni:4.0-20wt%, C:1.0-6.0wt%, N:0.2-1.5wt%, Mn:1.0-15wt%, Si≤2.0wt%, S≤0.03wt%, P≤0.03wt%, remaining is Fe.
Component requirements batching pressed by this alloy, with induction furnace melting, and high pressure nitrogen powder by atomization, obtained double carbide carbonitride alloys powder.In design of alloy, Cr, W, Mo, V, Ti is carbide carbon nitride and forms metallic element, in the alloy with the difference of its content and C content, MC type carbide, M2C type, M23C6 type, M7C3 type carbide and carbonitride (M is metallic element, and C is carbon and/or nitrogen) can be formed, several element coordinates in right amount and can ensure to form multiple carbide and carbonitride, and the formation of the netted eutectic carbides easily cracked of drawing up.The carbide of Ti and V and carbonitride have the effect stoping grain growth, thus also have the effect preventing crackle.In laser cladding process, the rapid heating of the laser beam that energy density is high, the high-melting-point carbide in alloy, carbonitride do not have enough time to melt, and play the effect of the nucleus of dispersion in rapid solidification subsequently, reduce solidification shrinkage, reduce thermal crack.Rational selection laser parameter, comprising: power, hot spot, out of focus distance, laser scanning speed (i.e. moving speed of laser beam), the time that regulation and control molten bath exists, and reduces fusion penetration, reduces the fusing of matrix metal, reduces heat affected zone, reduce thermal stresses.Ensure to obtain the anti-corrosion double carbide carbonitride alloys coating of laser cladding flawless high hardness wear-resisting.
Accompanying drawing illustrates: accompanying drawing 1 provides the IPG optical fibre laser head be loaded on " robot " arm and carries out laser cladding photo; Accompanying drawing 2 provides as embodiment, has the special tool photo of such carbide carbon nitride alloy layer of laser cladding; Accompanying drawing 3 provides as embodiment, has the special tool photo of such carbide carbon nitride alloy layer of laser cladding.
Embodiment: the anti abrasive position of requirement of special forming cutter requires high hardness wear-resisting layer, pre-coated double carbide powdered alloy, then with the IPG optical fiber laser laser head (accompanying drawing 1) be loaded on robotic arm, carry out laser scanning deposition by the path procedure woven at workpiece surface, the position required at special forming cutter obtains flawless laser cladding double carbide, carbonitride alloys coating.Accompanying drawing 2,3 provides the photo of such specially-shaped cutter.
Claims (3)
1. a laser cladding wear-and corrosion-resistant double carbide carbonitride alloys, the composition quality percentage ratio of alloy is:
Cr:15-35, W:8-50, Mo:2-25, V:0.5-3.0, Ti:0.5-4.0, Ni:4-20, C:1.0-6.0, N:0.2-1.5, Mn:1.0-15, Si≤2.0, S<0.03, P<0.03, remaining is Fe.
2. the double carbide carbonitride alloys described in claim 1, prepares burden by its composition proportion, and with induction furnace melting, high pressure nitrogen haze value obtains alloy powder.
3. at the pre-coated obtained carbide carbon nitride alloy powder of workpiece predetermined position, control laser device laser head by preset path at the pre-coated powdered alloy of workpiece surface laser scanning deposition, when laser power 1.5-2.0kW, spot diameter 4-5mm, sweep velocity 10-15mm/sec, overlay tissue signature is: γ-phase matrix is distributed with MC type, M2C type M6C type, M23C6 type and M7C3 type multicarbide and carbonitride, do not have carbide network and reticulattion in tissue.
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Cited By (5)
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| CN108315638A (en) * | 2018-01-31 | 2018-07-24 | 西北有色金属研究院 | A kind of cold spraying iron(-)base powder and its preparation method and application |
| CN108326287A (en) * | 2018-03-26 | 2018-07-27 | 浙江安可环保科技有限公司 | Corrosion-resistant laser cladding powder and its cladding method and purposes |
| CN110405197A (en) * | 2019-08-28 | 2019-11-05 | 燕山大学 | A kind of laser cladding powder and preparation method thereof and cladding layer and preparation method thereof |
| CN111118498A (en) * | 2020-03-06 | 2020-05-08 | 贵州大学 | TRIP steel coating for 304 stainless steel surface laser cladding and cladding method |
| US20220112583A1 (en) * | 2020-10-12 | 2022-04-14 | Toyota Jidosha Kubushiki Kaisha | Hard particle, sliding member, and production method of sintered alloy |
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| CN111118498A (en) * | 2020-03-06 | 2020-05-08 | 贵州大学 | TRIP steel coating for 304 stainless steel surface laser cladding and cladding method |
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| US11634799B2 (en) * | 2020-10-12 | 2023-04-25 | Toyota Jidosha Kabushiki Kaisha | Hard particle, sliding member, and production method of sintered alloy |
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Application publication date: 20151125 |