CN114985903B - Method for repairing micro holes on surface of laser nitriding amorphous alloy by mechanical scribing - Google Patents
Method for repairing micro holes on surface of laser nitriding amorphous alloy by mechanical scribing Download PDFInfo
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Abstract
The invention relates to a method for repairing micro holes on the surface of a laser nitriding amorphous alloy by mechanical scribing, and belongs to the technical field of amorphous alloy surface repair. And mechanically scribing the laser nitriding surface under a certain normal load by using a scribing test system with a Vickers pressure head, wherein the material in the scribing area is plastically deformed in the movement process of the pressure head, so that the pressure head and the micro holes in the material acting area are extruded and deformed or filled with the material, and further, the micro holes on the laser nitriding surface are repaired. The invention effectively solves the problems of holes, grooves and the like on the surface of the existing laser zirconium nitride-based amorphous alloy. The invention has simple implementation process, high efficiency and strong practicability, and can improve the surface quality and density of the scoring area and enhance the fatigue strength and the wear resistance.
Description
Technical Field
The invention relates to the technical field of amorphous alloy surface repair, in particular to a method for repairing micro holes on a laser nitriding amorphous alloy surface by mechanical scribing. The method for repairing the micro-holes on the surface by mechanical scribing has the advantages of simple implementation process, high efficiency, strong practicability and the like, and can improve the surface quality and the density of the scribing area and enhance the practical engineering applicability.
Background
Amorphous alloys exhibit excellent mechanical and physicochemical properties, such as high elasticity, low elastic modulus, good corrosion resistance and soft magnetic properties, due to their long-range disordered, short-range ordered atomic structure. In particular, the relatively high hardness and wear resistance compared to many crystalline metals provides potential applications for amorphous alloys in the manufacture of bearing rollers, protective armor, medical devices, and high-end sports equipment. In order to further expand the application range and meet the actual severe working condition requirements, it is necessary to further improve the surface properties of the amorphous alloy.
Laser nitriding has the advantages of simple operation, environmental friendliness, high efficiency and the like, and is widely applied to the improvement of the surface performance of materials. In the amorphous alloy laser nitriding process, based on the chemical affinity of nitrogen element in nitrogen and zirconium element in an amorphous alloy matrix under the high-temperature condition, zrN phase is generated in situ and embedded in the amorphous alloy matrix to form a nitriding layer with high hardness and high wear resistance. Therefore, the surface hardness and wear resistance of the zirconium-based amorphous alloy after laser nitriding are remarkably improved. However, laser nitrided surfaces tend to be very rough with significant peaks and valleys requiring mechanical grinding to reduce their surface roughness. But micro-holes dispersed on the laser nitrided surface after mechanical grinding still exist, which limits its applicability as a contact material. Therefore, there is an urgent need for a repair method that can achieve surface micro-scale defect repair without affecting the effect of the nitride layer.
Disclosure of Invention
The invention aims to provide a method for repairing micro holes on the surface of a laser nitriding amorphous alloy by mechanical scribing, which solves the problem that the existing laser nitriding zirconium-based amorphous alloy has micro hole defects on the surface. According to the method provided by the invention, the scratch test system with the Vickers pressure head is utilized to mechanically scratch the laser nitriding surface under a normal load, and the material in the scratch area is plastically deformed in the movement process of the pressure head, so that the pressure head and the micro-holes in the material acting area are extruded and deformed or filled with the material, and thus, the micro-holes on the surface are reduced.
The above object of the present invention is achieved by the following technical solutions:
the method for repairing micro holes on the surface of the laser nitrided amorphous alloy by mechanical scribing comprises the steps of mechanically scribing the surface of the laser nitrided amorphous alloy by using a scratch test system with a Vickers pressure head, wherein a scribing area material is plastically deformed in the movement process of the pressure head, so that the pressure head and the micro holes of a material acting area are extruded and deformed or filled with the material, and further the micro holes on the surface of the laser nitrided alloy are repaired, and the method comprises the following specific steps:
fixing a Vickers pressure head on a scratch test system through threads, fixing an amorphous alloy sample subjected to nanosecond laser nitriding on a scratch platform of the scratch test system, and setting a scratch initial position, a normal load and a scratch speed;
and secondly, scribing the surface of the laser nitride by the Vickers pressure head at the speed of 20 mu m/s under the normal load of 50-200 mN, wherein in the scribing process, the micro holes on the surface of the scribed area are extruded and deformed or filled with materials under the normal force, and the plastic deformation degree of the surface of the laser zirconium nitride-based amorphous alloy can be controlled by changing the normal load, so that the repair of the micro holes on the surface of the laser zirconium nitride-based amorphous alloy with different degrees is realized.
The nanosecond laser nitriding preparation process and the post-treatment process of the amorphous alloy sample in the first step are as follows: a nanosecond laser with a laser pulse width of 10ns, a wavelength of 1064nm and a repetition rate of 600kHz was used to perform laser scanning in a nitrogen atmosphere with a laser power of 3.7W, a scanning speed of 10mm/s, a lap ratio of 70% for adjacent scanning lines, and scanning times of 1 and 3, and then the laser scanning surface was polished with a diamond polishing paste of 1 μm particle size for 60 minutes.
The radius of the micro holes on the surface of the amorphous alloy sample after nanosecond laser nitridation in the step one is 1-5 mu m, and the depth of the micro holes is 0.1-0.5 mu m.
The invention has the beneficial effects that: when the scratch pressure head moves at a constant speed relative to the laser nitriding surface, the material in the scratch area is subjected to plastic deformation under the action of normal force and transverse force, so that the pressure head and the micro-hole in the material acting area are subjected to extrusion deformation or material filling, and the micro-hole defect in the scratch area is obviously repaired. At the same time, since the micro holes of the scribing area are filled up, the material becomes uniform and compact, which helps to enhance fatigue strength and wear resistance. The method effectively solves the problem that the existing laser zirconium nitride-based amorphous alloy has micropore defects on the surface. The method has the advantages of simple implementation process, high efficiency and strong practicability, does not influence the composition of the material in the scribing area, and is suitable for repairing the defects of the micro holes or the micro grooves on the surface of various amorphous alloys.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate and explain the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic diagram of a scratch test system according to the present invention;
FIG. 2 is a graph of the microscopic morphology of the amorphous alloy surface after nanosecond laser scanning in a nitrogen atmosphere in example 1 of the present invention;
FIG. 3 is a graph of the surface micro-topography of a laser zirconium nitride based amorphous alloy after mechanical scoring under a 50mN normal load in example 1 of the present invention;
FIG. 4 is a graph of the surface micro-topography of a laser zirconium nitride based amorphous alloy after mechanical scoring under a normal load of 100mN in example 1 of the present invention;
FIG. 5 is a graph of the microscopic morphology of the amorphous alloy surface after nanosecond laser scanning in a nitrogen atmosphere in example 2 of the present invention;
FIG. 6 is a graph of the surface micro-topography of a laser zirconium nitride based amorphous alloy after mechanical scoring under a 50mN normal load in example 2 of the present invention;
FIG. 7 is a graph of the surface micro-topography of a laser zirconium nitride based amorphous alloy after mechanical scoring under a normal load of 100mN in example 2 of the present invention;
FIG. 8 is a graph of the surface micro-topography of a laser zirconium nitride based amorphous alloy after mechanical scoring under a normal load of 200mN in example 2 of the present invention.
Detailed Description
The details of the present invention and its specific embodiments are further described below with reference to the accompanying drawings.
Referring to fig. 1, the method for repairing micro holes on a laser nitrided amorphous alloy surface by mechanical scribing according to the present invention uses a scratch test system with a vickers indenter to mechanically scribe the laser nitrided surface, and the material in the scribed area is plastically deformed during the movement of the indenter, so that the indenter and the micro holes in the material acting area are extruded and deformed or filled with the material, thereby repairing the micro holes on the laser nitrided surface, and the specific steps include:
fixing a Vickers pressure head on a scratch test system through threads, fixing an amorphous alloy sample subjected to nanosecond laser nitriding on a scratch platform of the scratch test system, and setting a scratch initial position, a normal load and a scratch speed;
and secondly, scribing the surface of the laser nitride by the Vickers pressure head at the speed of 20 mu m/s under the normal load of 50-200 mN, wherein in the scribing process, the micro holes on the surface of the scribed area are extruded and deformed or filled with materials under the normal force, and the plastic deformation degree of the surface of the laser zirconium nitride-based amorphous alloy can be controlled by changing the normal load, so that the repair of the micro holes on the surface of the laser zirconium nitride-based amorphous alloy with different degrees is realized.
Further, the nanosecond laser nitriding preparation process and the post-treatment process of the amorphous alloy sample in the first step are as follows: a nanosecond laser with a laser pulse width of 10ns, a wavelength of 1064nm and a repetition rate of 600kHz was used to perform laser scanning in a nitrogen atmosphere with a laser power of 3.7W, a scanning speed of 10mm/s, a lap ratio of 70% for adjacent scanning lines, and scanning times of 1 and 3, and then the laser scanning surface was polished with a diamond polishing paste of 1 μm particle size for 60 minutes.
Further, the surface micro-hole radius of the amorphous alloy sample after nanosecond laser nitridation in the step one is 1-5 mu m, and the micro-hole depth is 0.1-0.5 mu m.
The embodiment is used for explaining the method for repairing the micro holes on the surface of the laser nitriding amorphous alloy by mechanical scribing.
Zr41.2Ti13.8Cu12.5Ni10Be22.5 amorphous alloy blocks with the thickness of 2 mm, the length of 20 mm and the width of 20 mm are selected, the surfaces of the amorphous alloy blocks are polished, 400, 800, 1500 and 2000 # abrasive papers are sequentially used for polishing, then 0.5 micron diamond particle polishing paste is used for polishing until the mirror surfaces are smooth, and alcohol is used for cleaning the surfaces. Placing the block sample in a rectangular cavity into which nitrogen can be introduced, and scanning the block sample with a mirror surface facing upwards by using a nanosecond laser according to a set processing path to obtain a laser nitriding surface. And fixing the laser nitriding sample on a platform of a scratch test system for mechanical scratch test, and repairing the micro holes on the surface.
Example 1:
FIG. 2 shows a graph of the laser nitrided surface morphology obtained after laser scanning in a nitrogen atmosphere under test conditions of laser average power of 3.7W, scanning speed of 10mm/s, overlapping rate of adjacent scanning lines of 70%, repeated scanning for 1 time, and it can be seen that obvious micro holes exist on the nitrided surface.
FIG. 3 shows the surface morphology of the laser nitrided surface obtained under the test conditions of FIG. 2, with a selected normal load of 50mN and a scoring speed of 20 μm/s, and it can be seen that the surface micro-holes of the scored area are filled and that the number and size of micro-holes are significantly reduced.
FIG. 4 shows the surface morphology of the laser nitrided surface obtained under the test conditions of FIG. 2, the selected normal load is 100mN, the scoring speed is 20 μm/s, it can be seen that as the normal load increases, the plastic deformation degree of the material in the scoring area is enhanced, the surface micro holes are more obviously extruded and filled, and the micro holes in the surface of the scoring area are completely repaired.
Example 2:
FIG. 5 shows the laser nitrided surface topography obtained after laser scanning in a nitrogen atmosphere under test conditions of laser average power of 3.7W, scanning speed of 10mm/s, overlapping ratio of adjacent scanning lines of 70%, repeated scanning for 3 times, and it can be seen that micro holes of larger size are concentrated on the laser nitrided surface.
FIG. 6 shows the surface topography after scribing on a laser nitrided surface obtained under the test conditions of FIG. 5, with a selected normal load of 50mN and a scribing speed of 20 μm/s, as can be seen in that the scribe area has a reduced hole size and is filled with the material resulting from the scribing.
FIG. 7 shows the surface morphology of the laser nitrided surface obtained under the test conditions of FIG. 5, with a normal load of 100mN and a scoring speed of 20 μm/s, and it can be seen that the degree of plastic deformation of the material in the scored area is increased, the micro-holes in the surface of the scored area are significantly repaired, but a small number of micro-holes still exist.
FIG. 8 shows the surface morphology of the laser nitrided surface obtained under the test conditions of FIG. 5, with a normal load of 200mN and a scoring speed of 20 μm/s, and it can be seen that the micro holes in the surface of the scored area are completely repaired.
From the example results, the surface micro holes can be obviously reduced by mechanically scoring the surface of the laser zirconium nitride-based amorphous alloy to enable the surface micro holes to be extruded and deformed and be filled with materials. However, in order to achieve complete repair of the surface micro-holes, the normal load needs to be adjusted according to the size and number of actual surface micro-holes, so that the scribing area is subjected to proper plastic deformation.
The above description is only a preferred example of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A method for repairing micro holes on the surface of a laser nitriding amorphous alloy by mechanical scribing is characterized by comprising the following steps of: mechanical scribing is carried out on the laser nitriding surface by using a scribing test system provided with a Vickers pressure head, and a scribing area material is plastically deformed in the movement process of the pressure head, so that the pressure head and a micropore hole of a material acting area are extruded and deformed or filled with the material, and further, the laser nitriding surface micropore hole is repaired, and the specific steps comprise:
step one, performing laser scanning in a nitrogen environment by using a nanosecond laser with laser pulse width of 10ns, wavelength of 1064nm and repetition frequency of 600kHz under the conditions of laser power of 3.7W, scanning speed of 10mm/s, adjacent scanning line lap ratio of 70 percent and scanning times of 1 and 3 to prepare a nanosecond laser nitrided surface, and polishing the laser nitrided surface for 60 minutes by using diamond polishing paste with granularity of 1 mu m to generate micro-holes with radius of 1-5 mu m and depth of 0.1-0.5 mu m;
fixing a Vickers pressure head on a scratch test system through threads, fixing an amorphous alloy sample subjected to nanosecond laser nitriding on a scratch platform of the scratch test system, and setting a scratch initial position, a normal load and a scratch speed;
and thirdly, scribing the surface of the laser nitride by the Vickers pressure head at the speed of 20 mu m/s under the normal load of 50-200 mN, wherein in the scribing process, the micro holes on the surface of the scribed area are extruded and deformed or filled with materials under the normal force, and the plastic deformation degree of the surface of the laser zirconium nitride-based amorphous alloy can be controlled by changing the normal load, so that the repair of the micro holes on the surface of the laser zirconium nitride-based amorphous alloy with different degrees is realized.
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| CN113686679A (en) * | 2021-08-26 | 2021-11-23 | 山东建筑大学 | High-speed mechanical scribing test method and device for semiconductor crystal |
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| US20010035447A1 (en) * | 2000-05-05 | 2001-11-01 | Andreas Gartner | Methods for laser cut initiation |
| CN201261076Y (en) * | 2008-08-27 | 2009-06-24 | 浙江万丰摩轮有限公司 | Surface flaw repair extrusion knife |
| CN106392460A (en) * | 2016-11-04 | 2017-02-15 | 上海航天精密机械研究所 | Defect repairing method for magnesium/aluminum alloy casting |
| JP7039250B2 (en) * | 2017-10-27 | 2022-03-22 | 三菱重工業株式会社 | Repair equipment and repair method |
| CN108546893B (en) * | 2018-05-17 | 2019-12-27 | 吉林大学 | Method for improving surface hardness of zirconium-based or titanium-based amorphous alloy by laser irradiation in nitrogen |
| CN109740184B (en) * | 2018-12-07 | 2022-04-12 | 吉林大学 | Method for realizing surface planarization of pit-shaped microarray structure unit by secondary pressing |
| CN212042358U (en) * | 2020-04-29 | 2020-12-01 | 广东质好建筑模架科技有限公司 | Stamping die for quickly repairing holes of aluminum alloy template |
| CN111687587B (en) * | 2020-05-31 | 2021-08-13 | 西安交通大学 | Blunt circle repairing method for sharp damage of blade pits of blade disc of engine |
| CN113275740B (en) * | 2021-05-24 | 2022-06-10 | 吉林大学 | Method for realizing laser zirconium nitride based amorphous alloy surface planarization by laser polishing |
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| CN101422797A (en) * | 2007-10-31 | 2009-05-06 | 中国科学院金属研究所 | Metal sheet forming method |
| CN113686679A (en) * | 2021-08-26 | 2021-11-23 | 山东建筑大学 | High-speed mechanical scribing test method and device for semiconductor crystal |
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