阅读说明：本技术 Ta1和if钢复合的钛钢板晶界显示方法 (Grain boundary display method for titanium steel plate compounded by TA1 and IF steel ) 是由 张达富 刘兆华 刘希斌 于 2019-10-31 设计创作，主要内容包括：本发明公开了一种TA1和IF钢复合的钛钢板晶界显示方法,涉及晶界显示技术领域,解决按照分步腐蚀法来观察钛钢复合板的微观组织,需要分别腐蚀出钛和钢两种晶界并进行拼图,效率低下的问题。本发明采用的技术方案是：TA1和IF钢复合的钛钢板晶界显示方法,包括以下步骤：S1制备试样,并对试样进行抛光；S2将试样固定在扫描电镜样品台上；S3使用扫描电镜观察试样,将画面调整到合适的焦距；S4使用电子背散射衍射仪采集试样的衍射照片；S5设置扫描电镜的扫描参数并进行采集；S6对数据结果进行处理,得到钛钢板两侧的晶界形貌图片。本发明在不使用步腐蚀法,实现了钛钢板晶界Ti-α相和钢的铁素体相在同一张图片中的显示。(The invention discloses a grain boundary display method for a titanium steel plate compounded by TA1 and IF steel, relates to the technical field of grain boundary display, and solves the problems that the efficiency is low because two kinds of grain boundaries of titanium and steel need to be respectively corroded and spliced when the microstructure of the titanium steel composite plate is observed according to a step-by-step corrosion method. The technical scheme adopted by the invention is as follows: the grain boundary display method of the titanium steel plate compounded by TA1 steel and IF steel comprises the following steps: s1 preparing a sample and polishing the sample; s2, fixing the sample on a sample table of a scanning electron microscope; s3, observing the sample by using a scanning electron microscope, and adjusting the picture to a proper focal length; s4, acquiring a diffraction picture of the sample by using an electron back scattering diffractometer; s5, setting scanning parameters of the scanning electron microscope and collecting the scanning parameters; and S6, processing the data result to obtain the grain boundary morphology pictures of the two sides of the titanium steel plate. The method realizes the display of the Ti-alpha phase of the grain boundary of the titanium steel plate and the ferrite phase of the steel in the same picture without using a step corrosion method.)

The grain boundary display method of the titanium steel plate compounded by TA1 and IF steel is characterized in that: the method comprises the following steps:

s1, preparing a sample, and polishing the sample;

s2, fixing the sample on a sample table of a scanning electron microscope;

s3, observing the sample by using a scanning electron microscope, and adjusting the picture to a proper focal length;

s4, collecting a diffraction picture of the sample by using an electron back scattering diffractometer;

s5, setting scanning parameters of the scanning electron microscope and collecting the scanning parameters;

and S6, processing the data result to obtain grain boundary morphology pictures of the two sides of the titanium steel plate.

2. The grain boundary display method of a titanium steel sheet compounded with TA1 and IF steel according to claim 1, wherein: in step S1, after preparing the sample, the sample is polished by vibration through a vibration medium, wherein the vibration medium is one of silicon oxide, aluminum oxide and magnesium oxide suspensions.

3. The grain boundary display method of a titanium steel sheet compounded with TA1 and IF steel according to claim 2, wherein: in the step S1, preparing a sample with the length of 5-25 mm and the height of 5-15 mm from the titanium steel plate, grinding and primarily polishing to obtain a polished metallographic surface, and then performing vibration polishing: the amplitude is 40-80%, and the vibration time is 1-4 h.

4. The grain boundary display method of a titanium steel sheet compounded with TA1 and IF steel according to claim 1, wherein: in step S2, a conductive carbon tape is used to stick the sample to a stage of a scanning electron microscope with an inclination angle of 45-85 °.

5. The grain boundary display method of a titanium steel sheet compounded with TA1 and IF steel according to claim 1, wherein: in step S3, the scanning electron microscope conditions are: the accelerating voltage is 1-30 kV, the diaphragm size is 10-90 mu m, the sample working distance is 8-20 mm, and the amplification factor is 100-5000 times.

6. The grain boundary display method of a titanium steel sheet compounded with TA1 and IF steel according to any one of claims 1 to 5, wherein: in step S4, the collection conditions of the electron backscatter diffractometer are: and selecting a Titanium phase and an Iron-bcc phase as search terms, carrying out the next collection work if the sample can collect clear chrysanthemum pool patterns, and returning to the step S1 to prepare the sample again if the sample can not collect clear chrysanthemum pool patterns.

7. The grain boundary display method of a titanium steel sheet compounded with TA1 and IF steel according to claim 6, wherein: in step S5, the acquisition parameters are: the integration time is 1 multiplied by 1 to 8 multiplied by 8, the collection step length is 0.05 to 5.00 mu m, and the collection time is 10 to 60 min.

8. The grain boundary display method of a titanium steel sheet compounded with TA1 and IF steel according to claim 6, wherein: in step S6, the data type stored after the acquisition is finished is a channel 5 file, and then the acquired image is subjected to noise reduction processing by using the Manbo software, so as to obtain the grain boundary morphology pictures at the two sides of the titanium steel plate.

Technical Field

The invention relates to the technical field of grain boundary display, in particular to a method for displaying crystal grains of two phases of titanium and steel on the same picture for a titanium steel plate compounded by TA1 and IF steel.

Background

Titanium has the advantages of light weight, high specific strength, strong corrosion resistance and the like, and can stably exist in acidic, alkaline and neutral salt solutions, so that the titanium is widely applied to various fields of chemical reactors, heat exchangers and corrosion resistance, but the cost of the titanium is high. The titanium steel composite board produced by adopting the explosion cladding or rolling cladding method not only has the corrosion resistance of titanium, but also has the strength and plasticity of a common steel plate as a structural member, and most importantly, the cost is reduced, so that the titanium steel composite board is widely applied to the engineering fields of petrochemical industry, electric power, salt chemical industry, seawater desalination and the like.

In the titanium steel sheet obtained by compounding TA1 and IF steel, there is a technical problem in observing the microstructure of titanium and steel on both sides of the interface between the titanium steel sheets, namely how to simultaneously display the grain boundaries of titanium and steel. At present, the microstructure of the titanium steel composite plate is usually observed by adopting a step-by-step corrosion method, and because the corrosive liquids used by TA1 and IF steel are completely different and cannot simultaneously display two microstructures, two crystal boundaries of titanium and steel need to be respectively corroded, observation is carried out, and finally jigsaw is carried out, so that the efficiency is low.

Disclosure of Invention

The invention provides a display method of a TA1 and IF steel compounded titanium steel plate grain boundary Ti-alpha phase and a steel ferrite phase, which solves the problem of low efficiency caused by the fact that two kinds of grain boundaries of titanium and steel need to be respectively corroded and spliced when a microstructure of a titanium steel composite plate is observed according to a step corrosion method.

The technical scheme adopted by the invention for solving the technical problems is as follows: the grain boundary display method of the titanium steel plate compounded by TA1 steel and IF steel comprises the following steps:

s1, preparing a sample, and polishing the sample;

specifically, the method comprises the following steps: in step S1, after preparing the sample, the sample is polished by vibration through a vibration medium, wherein the vibration medium is one of silicon oxide, aluminum oxide and magnesium oxide suspensions.

For example, in step S1, a titanium steel plate is prepared into a sample with a length of 5 to 25mm and a height of 5 to 15mm, and is ground and primarily polished to obtain a polished metallographic surface, and then is subjected to vibration polishing: the amplitude is 40-80%, and the vibration time is 1-4 h.

S2, fixing the sample on a sample table of a scanning electron microscope;

specifically, the method comprises the following steps: in step S2, a conductive carbon tape is used to stick the sample to a stage of a scanning electron microscope with an inclination angle of 45-85 °.

S3, observing the sample by using a scanning electron microscope, and adjusting the picture to a proper focal length;

specifically, the method comprises the following steps: in step S3, the scanning electron microscope conditions are: the accelerating voltage is 1-30 kV, the diaphragm size is 10-90 mu m, the sample working distance is 8-20 mm, and the amplification factor is 100-5000 times.

S4, collecting a diffraction picture of the sample by using an electron back scattering diffractometer;

specifically, the method comprises the following steps: in step S4, the collection conditions of the electron backscatter diffractometer are: and selecting a Titanium phase and an Iron-bcc phase as search terms, carrying out the next collection work if the sample can collect clear chrysanthemum pool patterns, and returning to the step S1 to prepare the sample again if the sample can not collect clear chrysanthemum pool patterns.

S5, setting scanning parameters of the scanning electron microscope and collecting the scanning parameters;

specifically, the method comprises the following steps: in step S5, the acquisition parameters are: the integration time is 1 multiplied by 1 to 8 multiplied by 8, the collection step length is 0.05 to 5.00 mu m, and the collection time is 10 to 60 min.

And S6, processing the data result to obtain grain boundary morphology pictures of the two sides of the titanium steel plate.

Specifically, the method comprises the following steps: in step S6, the data type stored after the acquisition is finished is a channel 5 file, and then the acquired image is subjected to noise reduction processing by using the Manbo software, so as to obtain the grain boundary morphology pictures at the two sides of the titanium steel plate.

The invention has the beneficial effects that: the invention realizes the purpose of displaying the crystal grains of the titanium phase and the steel phase in the same picture on the premise of not using a step corrosion method. According to the appearance pictures of the grain boundaries at the two sides of the titanium steel plate, the grain boundaries of TA1 and IF steel of the titanium steel plate can be directly and simultaneously displayed, and the grain sizes of TA1 and IF steel can be visually observed.

Drawings

FIG. 1 is a picture of the grain boundary morphology at both sides of the titanium steel plate finally obtained by the embodiment of the present invention.

Detailed Description

The present invention will be further described with reference to the following examples.

The grain boundary display method of the titanium steel plate compounded by TA1 steel and IF steel comprises the following steps:

s1, preparing a sample, and polishing the sample.

Preparing a sample, namely preparing a titanium steel plate into a sample with the length of 5-25 mm and the height of 5-15 mm, grinding and primarily polishing to obtain a polished metallographic surface, so as to achieve a mirror surface effect and aim at removing scratches on the surface of the ground sample. After preparing the sample, the sample is vibrated and polished by a vibration medium, and the residual stress on the surface of the sample is removed by a vibration polishing mother. The vibrating medium is one of silica, alumina and magnesia suspensions, for example, vibratory finishing: the amplitude is 40-80%, and the vibration time is 1-4 h.

And S2, fixing the sample on a sample table of the scanning electron microscope.

And adhering the sample on a scanning electron microscope sample table with an inclination angle of 45-85 degrees by using a conductive carbon adhesive tape, wherein the sample needs to be firmly adhered, and the sample is prevented from falling off in the scanning process.

And S3, observing the sample by using a scanning electron microscope, and adjusting the picture to a proper focal length.

For example: the scanning electron microscope conditions were: the accelerating voltage is 1-30 kV, the diaphragm size is 10-90 mu m, the sample working distance is 8-20 mm, and the amplification factor is 100-5000 times.

S4, a diffraction photograph of the sample was taken using an electron back-scattering diffractometer.

A diffraction photograph of a sample was taken using an electron back-scattering diffractometer, and the conditions were set as follows: and (3) selecting a Titanium phase and an Iron-bcc phase from a database as search terms, carrying out next collection work if the cleaned chrysanthemum pool patterns can be collected by the sample, otherwise, unqualified sample preparation, and returning to the step 1 to prepare the sample again.

And S5, setting the scanning parameters of the scanning electron microscope and collecting.

The acquisition parameters are set as: the integration time is 1 multiplied by 1 to 8 multiplied by 8, the collection step length is 0.05 to 5.00 mu m, and the collection time is 10 to 60 min.

And S6, processing the data result to obtain grain boundary morphology pictures of the two sides of the titanium steel plate. And (3) saving the data type of the acquired data as a channel 5 file, and then performing noise reduction on the acquired image by using the Manbo software to finally obtain the grain boundary morphology pictures at the two sides of the titanium steel plate.

In the following, the examples of the present invention will be described, first, a cross-sectional test piece having a length of 15mm and a height of 8mm is cut out from a titanium steel plate slab made of TA1 and IF steel, the test piece is ground using 180#, 280#, 400#, 800# and 1200# metallographic abrasive paper, then the test piece is subjected to metallographic polishing on polishing cloths having a thickness of 9 μm, 3 μm, 1 μm and 0.5 μm, and then the surface stress is removed by a vibratory finishing machine, and the vibratory finishing is performed using a silica suspension as a vibration medium, with an amplitude of 50% and a vibration time of 1 h. And adhering the prepared sample on a sample table with a pre-inclination angle of 70 degrees, putting the sample into a scanning electron microscope, adjusting the surface focal distance of the sample at a working distance of 15mm, and then inserting an electron back scattering diffraction probe. Selecting a Titanium phase and an Iron-bcc phase in a database, firstly observing whether a clear chrysanthemum pool pattern can be obtained, and returning to prepare a sample again if the clear chrysanthemum pool pattern can not be obtained; if a clear chrysanthemum pool pattern is obtained, the collection can be started, and the collection parameters are as follows: the integration time is 2 × 2, the acquisition step size is 0.2 μm, and the acquisition time is 30 min. After the acquisition is finished, saving a file with a data type of channel 5, and performing noise reduction processing on the acquired image by using a Manbo software to obtain a picture of the appearance of the crystal boundary at two sides of the titanium steel plate, as shown in FIG. 1.