CN114147236A - Method for manufacturing stainless steel through ultrasonic rolling and strengthening laser additive - Google Patents
Method for manufacturing stainless steel through ultrasonic rolling and strengthening laser additive Download PDFInfo
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- 238000005096 rolling process Methods 0.000 title claims abstract description 99
- 239000000654 additive Substances 0.000 title claims abstract description 61
- 230000000996 additive effect Effects 0.000 title claims abstract description 61
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 53
- 239000010935 stainless steel Substances 0.000 title claims abstract description 50
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 50
- 238000005728 strengthening Methods 0.000 title claims abstract description 34
- 238000012545 processing Methods 0.000 claims abstract description 40
- 238000005260 corrosion Methods 0.000 claims abstract description 35
- 230000007797 corrosion Effects 0.000 claims abstract description 33
- 230000008569 process Effects 0.000 claims abstract description 24
- 230000003746 surface roughness Effects 0.000 claims abstract description 22
- 238000007514 turning Methods 0.000 claims abstract description 21
- 239000007769 metal material Substances 0.000 claims abstract description 14
- 239000002344 surface layer Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 42
- 230000003068 static effect Effects 0.000 claims description 14
- 239000010687 lubricating oil Substances 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 4
- 238000005056 compaction Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 230000002708 enhancing effect Effects 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 14
- 238000005516 engineering process Methods 0.000 description 14
- 230000002787 reinforcement Effects 0.000 description 9
- 239000010410 layer Substances 0.000 description 8
- 230000007547 defect Effects 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 4
- 230000010287 polarization Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000004372 laser cladding Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000005422 blasting Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 210000003850 cellular structure Anatomy 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/60—Treatment of workpieces or articles after build-up
- B22F10/66—Treatment of workpieces or articles after build-up by mechanical means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
- B33Y40/20—Post-treatment, e.g. curing, coating or polishing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention provides a method for enhancing the corrosion resistance of a stainless steel manufactured by laser additive manufacturing through ultrasonic rolling, which comprises the steps of turning a metal material manufactured by additive manufacturing through a lathe, and performing ultrasonic rolling on the surface of the turned metal material for a plurality of times through ultrasonic rolling equipment to enable the metal material to obtain residual compressive stress, refine a surface layer microstructure, improve microhardness and reduce surface roughness, and finally improve the corrosion resistance of a sample. The method has the advantages of convenient operation, simple process, good strengthening effect and great saving of processing cost.
Description
Technical Field
The invention relates to the technical field of machining of additive manufacturing metal, in particular to a method for manufacturing stainless steel through ultrasonic rolling and strengthening laser additive manufacturing.
Background
The laser additive manufacturing technology can produce parts with complex shapes, structures and individuation in a shorter time, and is concerned by researchers in the fields of biomedical equipment, marine equipment, remanufacturing and the like. The laser additive manufacturing technology is a manufacturing technology which utilizes high-density and high-energy laser beams as heat sources to melt synchronously fed powder or wire materials layer by layer in a layered two-dimensional plane of a three-dimensional CAD model in an inert gas protection environment according to a preset processing path, so that layered forming is realized. Compared with the traditional forging technology, the material manufactured by the laser additive technology has more complex microstructure, higher hardness, excellent corrosion resistance and better wear resistance. However, the surface of the part manufactured by the laser additive technology is rough, and the requirements of direct use in the aspects of size, precision and the like are difficult to achieve. Meanwhile, in the material increase process, defects such as pores, spheroidization, residual tensile stress, cracks and the like exist in the parts, and the defects can seriously affect the service life, reliability and corrosion resistance of the material. Therefore, the research on how to improve various defects existing in the laser material increase process and reduce the surface roughness and the residual tensile stress after processing makes the laser material increase process obtain the residual compressive stress, a compact microstructure and higher microhardness, and the research on further improving the corrosion resistance of the laser material increase process has important research significance.
The ultrasonic rolling technology is a novel surface strengthening technology which is based on ultrasonic wave assistance and integrates the traditional rolling processing and ultrasonic processing modes. The surface of the part after ultrasonic rolling treatment is similar to a mirror surface effect, surface grains are refined, residual compressive stress is introduced, and the surface roughness is greatly reduced, so that the fatigue resistance and the corrosion resistance of the part are improved.
The invention provides a method for strengthening laser additive manufacturing stainless steel by adopting an ultrasonic rolling technology, which improves the stress distribution state, gives the material surface lamination stress and obtains a surface layer structure with finer grains, higher microhardness and lower surface roughness. The corrosion resistance of the material is further improved on the basis of reducing subsequent processing procedures, cost and the like.
Disclosure of Invention
The parts manufactured by the laser additive technology have rough surfaces and are difficult to meet the requirements of direct use in the aspects of size, precision and the like; meanwhile, in the additive process, the parts have the defects of pores, spheroidization, residual tensile stress, cracks and the like, which seriously affect the technical problems of the service life, the reliability and the corrosion resistance of the material, so that the method for manufacturing the corrosion resistance of the stainless steel by the ultrasonic rolling reinforced laser additive is provided. The surface of the laser additive manufacturing material is subjected to ultrasonic rolling processing, so that the material obtains residual compressive stress, a surface layer microstructure is refined, microhardness is improved, surface roughness is reduced, and the corrosion resistance of the material is improved finally.
The technical means adopted by the invention are as follows:
the method for enhancing the corrosion resistance of the stainless steel manufactured by the laser additive through ultrasonic rolling comprises the steps of turning a metal material manufactured by the additive by using a lathe, and performing ultrasonic rolling on the surface of the turned metal material for a plurality of times by using ultrasonic rolling equipment to enable the metal material to obtain residual compressive stress, refine surface layer microstructures, improve microhardness and reduce surface roughness, so that the corrosion resistance of a sample is improved finally.
Further, the metal material is 316L stainless steel manufactured by laser additive manufacturing, and the turning is rough and fine turning.
Further, the method specifically comprises the following steps:
s1, performing laser additive manufacturing on the base bar material by using 316L stainless steel powder to obtain 316L laser additive manufacturing stainless steel;
s2, performing rough and fine turning on the bar stock after the additive manufacturing in the step S1, and reducing the surface roughness of the bar stock after the additive manufacturing;
s3, clamping the bar stock machined in the step S2 on a machine tool, setting ultrasonic rolling processing parameters, and carrying out ultrasonic rolling processing on the bar stock to obtain the ultrasonic rolling reinforced laser additive manufacturing stainless steel.
Further, in the step S2, the roughness of the surface of the bar after rough and fine turning does not exceed ra3.6, so as to meet the requirement of ultrasonic rolling processing.
Further, the specific steps of step S3 are as follows:
s31, clamping the bar stock turned in the step S2 on a machine tool, setting corresponding ultrasonic rolling speed, static pressure, feeding amount and amplitude parameters, and sequentially starting the machine tool, an ultrasonic switch and a lubricating oil switch to perform ultrasonic rolling;
s32, controlling the top of the ultrasonic rolling tool head to be in contact with the surface of the bar and ensuring that the center of the ultrasonic rolling tool head and the axis of the bar are at the same height, then carrying out multiple ultrasonic rolling processing on the bar, and continuously supplying lubricating oil all the time in the processing process to finally obtain the ultrasonic rolling reinforced laser additive manufacturing stainless steel.
Further, the ultrasonic rolling processing parameters are as follows: static pressure is 100-450N, ultrasonic rolling speed is 10-45m/min, and ultrasonic rolling frequency is 1-3.
Furthermore, the bar is ensured to rotate in each ultrasonic rolling processing process, the ultrasonic rolling tool head is controlled to move along the axial direction of the bar, and the contact between the ultrasonic rolling tool head and the bar is always kept in the processing process.
Further, the ultrasonic rolling tool head is a cylindrical roller press head.
Furthermore, the ultrasonic frequency of the ultrasonic rolling processing is 30kHz, and the output amplitude of the ultrasonic rolling tool head is 1-5 μm.
Compared with the prior art, the invention has the following advantages:
1. the invention provides a method for manufacturing stainless steel corrosion resistance by ultrasonic rolling reinforcement laser additive, wherein ultrasonic rolling reinforcement belongs to non-cutting processing, and the surface of a processed sample is bright. Compared with the strengthening processes such as ultrasonic shot blasting and the like, the surface roughness of the sample after ultrasonic rolling strengthening is lower, subsequent grinding and polishing treatment is not needed, and the requirements on the surface quality and the dimensional precision of the sample can be directly met, so that the complexity and the cost of multiple processes are reduced.
2. Compared with the prior art that a coating with stronger corrosion resistance is generally prepared on the surface of a material, the method for manufacturing the corrosion resistance of the stainless steel by the ultrasonic rolling reinforcement laser additive manufacturing method has high manufacturing cost and relatively complex process, and the ultrasonic rolling reinforcement technology is used for reinforcing the surface of the material to reinforce the surface structure so as to improve the corrosion resistance of the material. The method has the advantages of convenient operation, simple process, good strengthening effect and great saving of processing cost.
In conclusion, the technical scheme of the invention can solve the problems that the surface of a part manufactured by the laser additive technology in the prior art is rough, and the requirements of direct use on the aspects of size, precision and the like are difficult to achieve; meanwhile, in the material increase process, defects such as pores, spheroidization, residual tensile stress, cracks and the like exist in the parts, and the defects can seriously affect the service life, the reliability and the corrosion resistance of the material. The invention can improve the microhardness of the material, refine the microstructure, introduce residual compressive stress and improve the corrosion resistance of the material.
For the reasons, the invention can be widely popularized in the fields of metal machining of additive manufacturing and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a surface roughness trend chart of the 316L stainless steel manufactured by the additive manufacturing method after ultrasonic rolling strengthening under different static pressures.
FIG. 2 is a graph showing the change trend of microhardness of 316L stainless steel manufactured by additive manufacturing after ultrasonic rolling strengthening under different static pressures.
Fig. 3 is a residual stress trend chart of the 316L stainless steel manufactured by the additive manufacturing before and after ultrasonic rolling strengthening in the invention.
FIG. 4 is a microstructure view of a surface layer of 316L stainless steel manufactured by additive manufacturing after turning in the invention.
FIG. 5 is a microstructure diagram of the surface layer of 316L stainless steel manufactured by additive manufacturing after ultrasonic rolling in the invention.
Fig. 6 is a polarization curve diagram of additive manufacturing 316L stainless steel before and after ultrasonic roll strengthening in the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
The invention provides a method for ultrasonic rolling reinforcement of laser additive manufacturing stainless steel, and aims to provide the method for ultrasonic rolling reinforcement of 316L stainless steel through ultrasonic rolling processing on the surface of a metal material, so that the material obtains residual compressive stress, refines a surface layer microstructure, improves microhardness, reduces surface roughness and finally improves the corrosion resistance of the material.
The invention discloses a method for enhancing the corrosion resistance of laser additive manufacturing stainless steel by ultrasonic rolling, which is an ultrasonic rolling enhancing process for improving the corrosion resistance of laser additive manufacturing 316L stainless steel.
The selected metal material is 316L stainless steel manufactured by laser additive manufacturing, and the surface roughness of the material after rough turning and finish turning does not exceed Ra3.6 so as to meet the requirements of ultrasonic rolling processing.
The rolling tool head selected is a cylindrical roller ram.
The ultrasonic frequency of the ultrasonic rolling processing is 30kHz, and the output amplitude of the rolling tool head is 1-5 μm.
The invention provides an ultrasonic rolling strengthening process for improving the corrosion resistance of laser additive manufacturing metal, which specifically comprises the following steps:
a. performing additive manufacturing on the base bar stock by using 316L stainless steel powder;
b. turning the bar stock after the material increase by using a lathe to reduce the surface roughness of the bar stock after the material increase;
c. clamping a bar on a machine tool, setting corresponding parameters of rolling speed, static pressure, feeding amount and amplitude, and sequentially starting the machine tool, an ultrasonic switch and a lubricating oil switch;
d. the top of the rolling tool head is controlled to be in contact with the surface of the bar, the center of the rolling tool head and the axis of the bar are ensured to be at the same height, the bar is subjected to ultrasonic rolling processing, and uninterrupted lubricating oil is supplied all the time in the processing process. The specific processing parameters are as follows: the static pressure is 100-450N, the rolling speed is 10-45m/min, and the rolling frequency is 1-3.
The ultrasonic rolling strengthening belongs to the non-cutting processing, and the surface of a processed sample is bright. Compared with the strengthening process such as ultrasonic shot blasting, the surface roughness of the sample is lower after ultrasonic rolling strengthening, subsequent grinding and polishing treatment is not needed, and the requirements on the surface quality and the dimensional precision of the sample can be directly met, so that the complexity and the cost of a plurality of processes are reduced.
The existing anticorrosion technology generally prepares a coating with stronger corrosion resistance on the surface of a material, and has high manufacturing cost and relatively complex process. The ultrasonic rolling strengthening technology adopted by the invention is used for strengthening the surface of the material, strengthening the surface structure and further improving the corrosion resistance of the material. The method has the advantages of convenient operation, simple process, good strengthening effect and great saving of processing cost.
Example 1
(1) The test material is laser additive manufacturing 316L stainless steel with the size phi of 58 multiplied by 400mm, wherein the outermost layer of the bar stock is a laser cladding layer of the 316L stainless steel with the thickness of 4 mm.
(2) And (3) performing rough and fine turning on the surface of the bar stock, wherein the roughness after the processing is not more than Ra3.6.
(3) And carrying out ultrasonic rolling processing on the turned bar stock, and ensuring that the axis of the rolling tool head and the axis of the bar stock are at the same height by using the cylindrical rolling tool head.
(4) Starting the machine tool to ensure that the rolling speed is 15m/min, the feed rate is 0.1mm/r, starting the ultrasonic generator to ensure that the frequency is 30kHz, starting lubricating oil lubrication, adjusting the amplitude to ensure that the output amplitude of the rolling tool head is 1 mu m, adjusting the static pressure to be 100N, 200N and 300N respectively, and ensuring that the rolling pass is 1 time.
Comparative example 1:
(1) the test material is laser additive manufacturing 316L stainless steel with the size phi of 58 multiplied by 400mm, wherein the outermost layer of the bar stock is a laser cladding layer of the 316L stainless steel with the thickness of 4 mm.
(2) And (3) performing rough and fine turning on the surface of the bar stock, wherein the roughness after the rough and fine turning is not more than Ra3.6, and taking the bar stock as an original sample.
Comparative example 2:
(1) the test material is laser additive manufacturing 316L stainless steel with the size phi of 58 multiplied by 400mm, wherein the outermost layer of the bar stock is a laser cladding layer of the 316L stainless steel with the thickness of 4 mm.
(2) And (3) performing rough and fine turning on the surface of the bar stock, wherein the roughness after the processing is not more than Ra3.6.
(3) And carrying out ultrasonic rolling processing on the turned bar stock, and ensuring that the axis of the rolling tool head and the axis of the bar stock are at the same height by using the cylindrical rolling tool head.
(4) Starting the machine tool to ensure that the rolling speed is 15m/min, the feed rate is 0.1mm/r, starting the ultrasonic generator to ensure that the frequency is 30kHz, starting lubricating oil lubrication, adjusting the amplitude to ensure that the output amplitude of the rolling tool head is 1 mu m, adjusting the static pressure to 400N, and rolling for 1 time.
And (3) test results:
1. surface roughness
The surface roughness Ra of the sample after turning is 1.560 μm (comparative example 1); taking the static pressure of 400N as an example, the surface roughness Ra of the sample after ultrasonic rolling strengthening is 0.095 μm (comparative example 2), the reduction of the surface roughness reaches 94%, and the ultrasonic rolling strengthening greatly reduces the surface roughness of the material. As shown in fig. 1.
2. Microhardness
The 316L stainless steel for additive manufacturing was turned to a microhardness of 221.72HV at a distance of 30 μm from the surface (comparative example 1). Taking static pressure 400N as an example (comparative example 2), the microhardness of 316L stainless steel subjected to ultrasonic rolling strengthening at a position 30 μm away from the surface of the sample is 327.67HV, and compared with turning, the microhardness of ultrasonic rolling is improved by 48%. As shown in fig. 2.
3. Residual stress
The residual stress of the original sample is represented as residual tensile stress (comparative example 1), and the sample is converted from the original residual tensile stress to the residual compressive stress after ultrasonic rolling strengthening (comparative example 2). As shown in fig. 3.
4. Microstructure of
Taking static pressure 400N as an example (comparative example 2), compared with a cutting sample (comparative example 1), the size of the microscopic cellular structure of the sample is obviously reduced after ultrasonic rolling strengthening, and the microscopic grain refinement phenomenon occurs. The microscopic grain size of comparative example 1 was about 536nm and that of comparative example 2 was about 190nm as measured by ImageJ software. Therefore, the surface structure of the material can be refined by ultrasonic rolling reinforcement. As shown in fig. 4 and 5.
5. Polarization curve
Taking the static pressure of 400N as an example (comparative example 2), compared with a cutting sample (comparative example 1), the self-corrosion potential of the sample is increased to-3.05V from-3.65V after ultrasonic rolling strengthening, and the self-corrosion current density is increased from 1.665 multiplied by 10-6A·cm-2Down to 2.245 x 10-7A·cm-2. As shown in fig. 6. The results of fitting the polarization curve of additive manufactured 316L stainless steel are shown in table 1.
In conclusion, the corrosion resistance of the surface of the sample can be improved by ultrasonic rolling reinforcement. The method is mainly characterized in that the surface roughness of the material can be greatly reduced by ultrasonic rolling, surface crystal grains are refined, and residual compressive stress is introduced, so that the corrosion resistance of the material is improved.
Table 1 fitting results of polarization curves for additive manufacturing 316L stainless steel
In conclusion, the invention aims to improve the corrosion resistance of the 316L stainless steel manufactured by the additive, reduces the surface roughness of the material, improves the microhardness of the material and induces the residual compressive stress through ultrasonic rolling reinforcement to promote the refinement of the surface structure of the material so as to realize the improvement of the corrosion resistance of the material, and the process is simple to operate and has obvious improvement of the corrosion resistance. The process not only aims at the stainless steel material, but also can perform surface strengthening on other metal materials (such as nickel alloy, magnesium alloy and the like) by properly adjusting rolling parameters, and has wide application range.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The method is characterized in that after turning is carried out on a metal material subjected to additive manufacturing by using a lathe, ultrasonic rolling equipment is used for carrying out ultrasonic rolling processing on the surface of the turned metal material for a plurality of times, so that the metal material obtains residual compressive stress, a surface layer microstructure is refined, microhardness is improved, surface roughness is reduced, and finally the corrosion resistance of a sample is improved.
2. The method of claim 1, wherein the metal material is 316L stainless steel and the turning is rough and fine turning.
3. The ultrasonic roll-compaction laser additive manufacturing method for the corrosion resistance of stainless steel according to claim 2, wherein the method specifically comprises the following steps:
s1, performing laser additive manufacturing on the base bar material by using 316L stainless steel powder to obtain 316L laser additive manufacturing stainless steel;
s2, performing rough and fine turning on the bar stock after the additive manufacturing in the step S1, and reducing the surface roughness of the bar stock after the additive manufacturing;
s3, clamping the bar stock machined in the step S2 on a machine tool, setting ultrasonic rolling processing parameters, and carrying out ultrasonic rolling processing on the bar stock to obtain the ultrasonic rolling reinforced laser additive manufacturing stainless steel.
4. The method for ultrasonic roll-strengthening laser additive manufacturing of stainless steel according to claim 3, wherein in step S2, the roughness of the surface of the bar after rough and fine turning does not exceed ra3.6, so as to meet the requirements of ultrasonic roll-processing.
5. The method for ultrasonic roll-strengthening laser additive manufacturing of stainless steel according to claim 4, wherein the specific steps of step S3 are as follows:
s31, clamping the bar stock turned in the step S2 on a machine tool, setting corresponding ultrasonic rolling speed, static pressure, feeding amount and amplitude parameters, and sequentially starting the machine tool, an ultrasonic switch and a lubricating oil switch to perform ultrasonic rolling;
s32, controlling the top of the ultrasonic rolling tool head to be in contact with the surface of the bar and ensuring that the center of the ultrasonic rolling tool head and the axis of the bar are at the same height, then carrying out multiple ultrasonic rolling processing on the bar, and continuously supplying lubricating oil all the time in the processing process to finally obtain the ultrasonic rolling reinforced laser additive manufacturing stainless steel.
6. The method for ultrasonically roll-strengthening the laser additive manufacturing corrosion-resistant performance of stainless steel according to claim 3 or 5, wherein the ultrasonic roll-working parameters are as follows: static pressure is 100-450N, ultrasonic rolling speed is 10-45m/min, and ultrasonic rolling frequency is 1-3.
7. The method for ultrasonic roll-strengthening laser additive manufacturing of stainless steel according to claim 5, wherein the bar is guaranteed to rotate during each ultrasonic roll-processing, the ultrasonic roll-processing tool head is controlled to move axially along the bar, and the contact between the ultrasonic roll-processing tool head and the bar is maintained during the processing.
8. The method for ultrasonic roll-strengthening laser additive manufacturing of stainless steel corrosion resistance according to claim 5 or 7, wherein the ultrasonic roll tool head is a cylindrical roller ram.
9. The method for ultrasonic roll-strengthening laser additive manufacturing of stainless steel according to claim 8, wherein the ultrasonic frequency of the ultrasonic roll-working is 30kHz, and the output amplitude of the ultrasonic roll-working tool head is 1-5 μm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114682800A (en) * | 2022-05-31 | 2022-07-01 | 太原理工大学 | Method for manufacturing eutectic high-entropy alloy plate by ultrasonic rolling surface strengthening laser additive |
| CN114770029A (en) * | 2022-04-25 | 2022-07-22 | 贵州电网有限责任公司 | Surface modification method for improving stress corrosion resistance of 7075-T6 aluminum alloy |
| CN114941064A (en) * | 2022-04-20 | 2022-08-26 | 大连海事大学 | Surface treatment method for strengthening low-temperature mechanical property of marine steel |
| CN115747683A (en) * | 2022-09-27 | 2023-03-07 | 贵州电网有限责任公司 | Method for improving intergranular corrosion resistance of aluminum alloy |
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| CN114682800B (en) * | 2022-05-31 | 2022-09-06 | 太原理工大学 | Method for manufacturing eutectic high-entropy alloy plate by ultrasonic rolling surface strengthening laser additive |
| CN115747683A (en) * | 2022-09-27 | 2023-03-07 | 贵州电网有限责任公司 | Method for improving intergranular corrosion resistance of aluminum alloy |
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