CN110954571A - Experimental method for rapidly improving hardness of titanium alloy at normal temperature - Google Patents
Experimental method for rapidly improving hardness of titanium alloy at normal temperature Download PDFInfo
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- CN110954571A CN110954571A CN201911280644.XA CN201911280644A CN110954571A CN 110954571 A CN110954571 A CN 110954571A CN 201911280644 A CN201911280644 A CN 201911280644A CN 110954571 A CN110954571 A CN 110954571A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
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- G01N23/2251—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material using electron or ion using incident electron beams, e.g. scanning electron microscopy [SEM]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
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- G—PHYSICS
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Abstract
The invention discloses an experimental method for rapidly improving the hardness of titanium alloy at normal temperature, which comprises the steps of processing a titanium alloy raw material into a cylindrical sample, removing a surface oxidation layer, and placing the sample between two electrodes of an electric impact treatment device; setting parameters of electric impact, carrying out electric impact treatment on the sample, removing a surface oxide layer after the sample is cooled to room temperature, cutting the sample subjected to electric impact treatment along a central axis by wire cutting, preparing a metallographic specimen by hot embedding, and grinding, polishing and cleaning the metallographic specimen; representing microstructure changes of the metallographic sample before and after the electric impact treatment by using a scanning electron microscope, and detecting hardness changes of the metallographic sample before and after the electric impact treatment by using a microhardness tester; and comparing and analyzing the hardness change of the titanium alloy before and after treatment and the relation between the hardness change and the microstructure to obtain an experimental conclusion. The method can rapidly improve the overall hardness of the titanium alloy at normal temperature in a short time, and has important significance for the research and application of the titanium alloy.
Description
Technical Field
The invention belongs to the field of titanium alloy, and particularly relates to an experimental method for rapidly improving the hardness of titanium alloy at normal temperature.
Background
The common titanium alloy structure mainly comprises α phase and β phase, and the contents of different α phase and β phase directly influence the performance of the titanium alloy.
The titanium alloy material with high hardness is required to work under a specific working condition, so that researchers improve the hardness of the titanium alloy by means of solution treatment, ion implantation treatment, ultrasonic treatment and the like, so that the material reaches the use standard. Therefore, an experimental method for improving the hardness of the titanium alloy is found, and particularly a simple and energy-saving novel experimental method capable of quickly improving the hardness of the titanium alloy at normal temperature is of great significance for guiding the application of the titanium alloy in practice.
Disclosure of Invention
The invention aims to provide an experimental method for rapidly improving the hardness of a titanium alloy at normal temperature, which can rapidly improve the overall hardness of the titanium alloy at normal temperature in a short time and has important significance for the research and application of the titanium alloy.
The technical scheme adopted by the invention is as follows:
an experimental method for rapidly improving the hardness of a titanium alloy at normal temperature comprises the following steps:
s1, processing a titanium alloy raw material into a cylindrical sample, removing a surface oxidation layer, and placing the sample between two electrodes of an electric shock treatment device;
s2, setting parameters of electric shock, carrying out electric shock treatment on the sample, removing a surface oxide layer after the sample is cooled to room temperature, cutting the sample subjected to electric shock treatment along a central axis by wire cutting, preparing a metallographic specimen by hot embedding, and grinding, polishing and cleaning the metallographic specimen;
s3, representing microstructure changes of the metallographic specimen before and after the electric impact treatment by using a scanning electron microscope, and detecting hardness changes of the metallographic specimen before and after the electric impact treatment by using a microhardness tester;
s4, comparing and analyzing the hardness change of the titanium alloy before and after the treatment and the relation between the hardness change and the microstructure to obtain an experimental conclusion.
In step S1, the surface oxide layer is removed by sanding.
In step S2, the surface oxide layer is removed by sanding, and the metallographic specimen is sequentially sanded from coarse to fine.
In step S2, polishing is performed with OPS polishing liquid.
In step S2, cleaning is performed with alcohol ultrasonics.
In step S3, when the hardness change of the metallographic specimen before and after the electric shock treatment is detected, a plurality of points forming a matrix are respectively selected from the upper, middle and lower areas of the metallographic specimen for hardness test, and after the maximum value and the minimum value are removed, the average value and the distribution of the hardness values of the titanium alloy before and after the treatment are obtained.
In step S3, when the microstructure of the metallographic specimen changes before and after the electric shock treatment, the middle region of the metallographic specimen is selected.
The invention has the beneficial effects that:
the method can rapidly improve the overall hardness of the titanium alloy at normal temperature in a short time, and the time consumption of the treatment process is short when the titanium alloy is treated by electric shock at normal temperature. The hardness of the titanium alloy is improved mainly by the fact that the microstructure of the titanium alloy is changed through electric shock treatment, and the electric shock treatment technology is shown to be capable of rapidly improving the hardness of the titanium alloy at normal temperature and has important significance for research and application of the titanium alloy.
Drawings
FIG. 1 is a schematic diagram of hardness testing and a pre-and post-treatment hardness value distribution graph, wherein a) is a schematic diagram of hardness testing and b) is a distribution graph of average hardness values before and after treatment.
FIG. 2 is an SEM (scanning Electron microscope) image of the titanium alloy phase structure before and after the treatment, wherein a) is before the treatment and b) is after the treatment.
Detailed Description
The invention is further described below with reference to the figures and examples.
An experimental method for rapidly improving the hardness of a titanium alloy at normal temperature comprises the following steps.
S1, taking titanium alloy TC11 as an example, a bar-shaped titanium alloy TC11 raw material is prepared into a cylindrical sample with the diameter of 5 multiplied by 10mm by a linear cutting method, a surface oxidation layer is removed by sanding, and the sample is placed between two electrodes of an electric shock treatment device.
S2, setting the electric shock processing parameters as follows: the front end input current amplitude value is 70A, the action time is 0.12s, the sample is subjected to electric shock treatment, after the sample is cooled to the room temperature, a surface oxide layer is removed by grinding with abrasive paper, the sample subjected to electric shock treatment is cut along the central axis by wire cutting and is inlaid by heat to prepare a metallographic specimen, the metallographic specimen is sequentially ground from coarse to fine by using abrasive paper, polished by using OPS polishing solution, and finally, the metallographic specimen is cleaned by using alcohol ultrasonic.
S3, selecting a middle area of the metallographic specimen, and representing microstructure changes of the metallographic specimen before and after the electric impact treatment by using a scanning electron microscope; the hardness change of the metallographic sample before and after the electric impact treatment is detected by a microhardometer, for accurate hardness test, 25 points (5 multiplied by 5 matrix, distance between two points is 0.5mm) are respectively selected from the upper, middle and lower areas of the metallographic sample to carry out the hardness test (shown as a in figure 1), the pressure value is set to be 500N, the holding time is set to be 5s, and after the maximum value and the minimum value are removed, the average value (shown as b in figure 1) and the distribution of the hardness values of the sample before and after the treatment are obtained.
S4, comparing and analyzing the hardness change of the titanium alloy before and after the treatment and the relation between the hardness change and the microstructure to obtain an experimental conclusion:
s4.1, analyzing the hardness change of the titanium alloy before and after treatment;
the hardness changes of the titanium alloy before and after the electric shock treatment are analyzed by taking the upper, middle and lower areas of the sample as test objects in the experimental process, and the result is shown as b) in fig. 1, so that the average hardness value of the sample after the electric shock treatment is obviously improved. As can be seen from Table 1, the average hardness value 362.0HV in the upper region of the untreated sample was greater than those in the middle 318.4HV and lower 325.4HV regions, with no significant change in the middle and lower regions, and the average hardness values in the upper, middle and lower regions of the electric shock treated sample were no significant change, with the average hardness values being 397.7HV, 397.7HV and 393.7HV, respectively. It is shown that the electric shock treatment can not only improve the hardness of the titanium alloy, but also achieve the effect of uniformizing the hardness of the distribution of the hardness of the upper, middle and lower regions.
TABLE 1 hardness distribution of TC11 before and after electric impact treatment
S4.2, analyzing the microstructure change of the titanium alloy before and after treatment;
the TC11 titanium alloy belongs to α + β type titanium alloy, and FIG. 2 is an SEM image of a microscopic phase structure of the titanium alloy before and after electric shock treatment, wherein a) in FIG. 2 shows a structure before treatment, and b) in FIG. 2 shows a structure after treatment, it can be found that a plurality of needle-shaped secondary α phases (gray) exist in β phase (white) of the internal structure of a sample before treatment, the phase structure is completely changed after electric shock treatment, a primary α phase and a secondary α phase are not seen, phase transformation occurs, the phase structure is completely converted into β phase and a dispersed needle-shaped α phase, and a fine needle-shaped α phase is a main contributor to strength improvement.
S4.3, obtaining a conclusion;
after the electric shock treatment, the temperature of the titanium alloy sample is rapidly increased and reaches a phase transformation point, a primary α phase and a secondary α phase are transformed into a β phase, a large amount of very fine needle-shaped α phases are separated from the interior of the sample along with the rapid cooling of the sample in the air and are uniformly distributed, and the large amount of fine needle-shaped α phases are mutually staggered to play a role of dispersion strengthening in the material so as to improve the hardness of the material.
The technical method is also suitable for other technologies for rapidly improving the hardness of the titanium alloy, and the method is the same as the example and has the same effect, and the examples are not listed.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (7)
1. An experimental method for rapidly improving the hardness of titanium alloy at normal temperature is characterized in that: comprises the steps of (a) carrying out,
s1, processing a titanium alloy raw material into a cylindrical sample, removing a surface oxidation layer, and placing the sample between two electrodes of an electric shock treatment device;
s2, setting parameters of electric shock, carrying out electric shock treatment on the sample, removing a surface oxide layer after the sample is cooled to room temperature, cutting the sample subjected to electric shock treatment along a central axis by wire cutting, preparing a metallographic specimen by hot embedding, and grinding, polishing and cleaning the metallographic specimen;
s3, representing microstructure changes of the metallographic specimen before and after the electric impact treatment by using a scanning electron microscope, and detecting hardness changes of the metallographic specimen before and after the electric impact treatment by using a microhardness tester;
s4, comparing and analyzing the hardness change of the titanium alloy before and after the treatment and the relation between the hardness change and the microstructure to obtain an experimental conclusion.
2. The experimental method for rapidly increasing the hardness of titanium alloy at normal temperature according to claim 1, wherein: in step S1, the surface oxide layer is removed by sanding.
3. The experimental method for rapidly increasing the hardness of titanium alloy at normal temperature according to claim 1, wherein: in step S2, the surface oxide layer is removed by sanding, and the metallographic specimen is sequentially sanded from coarse to fine.
4. The experimental method for rapidly increasing the hardness of titanium alloy at normal temperature according to claim 1, wherein: in step S2, polishing is performed with OPS polishing liquid.
5. The experimental method for rapidly increasing the hardness of titanium alloy at normal temperature according to claim 1, wherein: in step S2, cleaning is performed with alcohol ultrasonics.
6. The experimental method for rapidly increasing the hardness of titanium alloy at normal temperature according to claim 1, wherein: in step S3, when the hardness change of the metallographic specimen before and after the electric shock treatment is detected, a plurality of points forming a matrix are respectively selected from the upper, middle and lower areas of the metallographic specimen for hardness test, and after the maximum value and the minimum value are removed, the average value and the distribution of the hardness values of the titanium alloy before and after the treatment are obtained.
7. The experimental method for rapidly increasing the hardness of titanium alloy at normal temperature according to claim 1, wherein: in step S3, when the microstructure of the metallographic specimen changes before and after the electric shock treatment, the middle region of the metallographic specimen is selected.
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| CN111366599A (en) * | 2020-04-20 | 2020-07-03 | 武汉理工大学 | Rapid nanocrystallization experimental method for titanium-based composite material reinforcement |
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