CN103759993A - Metallographic specimen preparation method - Google Patents
Metallographic specimen preparation method Download PDFInfo
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- CN103759993A CN103759993A CN201310750149.7A CN201310750149A CN103759993A CN 103759993 A CN103759993 A CN 103759993A CN 201310750149 A CN201310750149 A CN 201310750149A CN 103759993 A CN103759993 A CN 103759993A
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Abstract
The invention discloses a metallographic specimen preparation method. The metallographic specimen preparation method particularly comprises the following steps: firstly, sampling a metallographic specimen; secondly, inserting the metallographic specimen; thirdly, polishing the metallographic specimen; fourthly, carrying out acid etching and washing on a to-be-polished surface of the metallographic specimen, namely putting the to-be-polished surface into nital for etching and washing with water; and finally, polishing the metallographic specimen. The metallographic specimen preparation method is simple and rapid; abrasive material particles and metal abrasive dust particles on the polished surface are dissolved by adding the nital etching procedure before polishing; obvious polishing marks cannot be left on the polished specimen, and thus the polishing effect of the metallographic specimen is improved; the polishing time of the metallographic specimen is shorter than before, and the polishing efficiency is improved.
Description
Technical field
The present invention relates to material microstructure detection field, particularly a kind of metallographic specimen preparation method.
Background technology
The check of metallographic microstructure need to just can be tested forming metallographic specimen after exemplar polishing, the quality of quality of finish directly has influence on test effect, the object of sample polishing is in order to remove the polishing scratch that stays on sample flour milling, to obtain the surface like minute surface, for display organization ready.
Common metallographic specimen preparation flow is: sample sampling (cutting), and---sample is inlayed while having specific (special) requirements (exemplar too little or)---sample polishing---sample polishing.After above several procedures, exemplar face to be checked reaches luminance brightness just can carry out the check of metallographic structure.Conventional this way sample polishing effect is bad, although polishing time is longer, polished surface also exists visible obvious polishing scratch.Due to the existence of sample polishing scratch, the judgement of metal lographic examination result is had to impact.
Summary of the invention
The present invention is in order to overcome defect in above-mentioned prior art, and a kind of simple and fast is provided, and increases nital etch operation before polishing, improved metallographic specimen polishing effect, improved the metallographic specimen preparation method of polishing efficiency.
For achieving the above object, according to the invention provides a kind of metallographic specimen preparation method, concrete steps comprise:
First, metallographic specimen sampling;
Secondly, metallographic specimen is inlayed;
Again, metallographic specimen polishing;
Again, polished acid etch, the flushing of metallographic specimen: treat polished surface and be put into water after nital etch and rinse;
Finally, metallographic specimen polishing.
In technique scheme, metallographic specimen is inlayed in step and is selected to inlay according to metallographic specimen size and surface treatment situation.
In technique scheme, in metallographic specimen polishing step, polishing process is cooling to prevent that sample is overheated and tissue changes to metallographic specimen immersion.
In technique scheme, the concentration of nital is 3%～5%.
In technique scheme, nital drops in polished above or whole polished face is put into etch in nital.
In technique scheme, the etch time of nital is 3～5 seconds.
Compared with prior art, the present invention has following beneficial effect: this metallographic specimen preparation method simple and fast, by increase nital etch operation before polishing, dissolve abrasive particle and the metal filings particle stayed on flour milling, sample after polishing can not leave obvious polishing scratch, has improved the polishing effect of metallographic specimen; The polishing time of sample is shorter than original, has improved polishing efficiency.
Accompanying drawing explanation
Fig. 1 is metallographic specimen preparation method's of the present invention process flow diagram.
Embodiment
Below in conjunction with accompanying drawing, a specific embodiment of the present invention is described in detail, but is to be understood that protection scope of the present invention is not subject to the restriction of embodiment.It will be appreciated that, mentioned in following embodiment of the present invention " on ", D score, " left side ", " right side ", " front " and " reverse side " be all take the direction shown in each figure as benchmark, these words that are used for limiting direction are only used to be convenient to explanation, do not represent the restriction to the concrete technical scheme of the present invention.
Metallographic specimen preparation method simple and fast of the present invention, by increase nital etch operation before polishing, dissolve abrasive particle and the metal filings particle stayed on flour milling, the sample after polishing can not leave obvious polishing scratch, has improved the polishing effect of metallographic specimen; The polishing time of sample is shorter than original, has improved polishing efficiency.
Detailed description by way of example but unrestriced mode has illustrated the disclosure, should be understood that the realization that can be combined by independent realization or with other aspects in various aspect of the present disclosure below.This instructions clearly enables those skilled in the art to manufacture and uses us to believe for new and non-obvious improvement, describe some embodiment, alternative, modification, alternatives and system applies, comprised the current best mode that is considered to carry out the inventive principle of describing in this instructions.When describing element or feature and/or embodiment, titled with " one " " one " " be somebody's turn to do " and " described ", be intended to expression and there are one or more in element or feature.Term " comprises " that " comprising " and " having " is intended to is comprising property, and also has extra element or feature beyond being illustrated in those specifically described elements or feature.
------sample polishing (corase grind, fine grinding)---nitric acid alcohol etch sample---sample wash---sample polishing that sample is inlayed while having specific (special) requirements (exemplar too little or) that this metallographic specimen preparation method flow process is: sample sampling (cutting), after the exemplar sample polishing of original metallographic sample preparation flow process, increase acid etch operation one before polishing, its concrete steps comprise:
First, metallographic specimen sampling;
At representational position, intercept sample, during intercepting, prevent that sample from occurring in intercepting process overheated, in order to avoid sample tissue changes because being heated; The special surface that should note protecting sample while intercepting exemplar, as the damage characteristic on thermal treatment surface strengthen layer, thermo-chemical treatment infiltration layer, thermally sprayed coating and coating, oxidation and decarbonization layer, cracked zone and waste product or inefficacy part, does not allow to damage because of intercepting.
Secondly, metallographic specimen is inlayed;
According to metallographic specimen size and surface treatment situation, select to inlay, as large in sample or surface does not have can inlaying of specific (special) requirements, and specific (special) requirements comprises: surfaceness requirement.
Again, metallographic specimen polishing;
Metallographic face to be detected is polished, and polishing process is cooling to prevent that sample is overheated and tissue changes to metallographic specimen immersion.
Again, polished acid etch, the flushing of metallographic specimen;
On polished, splash into the nital (alcohol and nitric acid mixed solution) of several 3%～5%, also can make whole polished face be put into etch in 3%～5% nital, the etch time is that after 3～5 seconds, water is sample wash, and the amount of splashing into of nital is dipped into polished face just can.
Finally, metallographic specimen polishing;
To the polished mirror polish after rinsing, polishing effect is very obvious, and polishing time is fewer than original, and polished surface does not have obvious visible polishing scratch.
Because metal is in polishing process, the abrasive particle coming off and metal filings particulate fraction are stayed on sample flour milling, directly water rinses and during without the etch of nitric acid alcohol, abrasive particle and metal filings particle are washed off not exclusively and are remained on sample flour milling, if at this moment direct polishing sample, residual particle easily scratches flour milling and produces new cut, and polishing effect is poor, on assay, can produce direct impact.If after sample polishing, with polishing again after 3～5% nital etch, polishing effect is very obvious, polishing velocity is fast, and can not produce new cut.Because, nital is alcohol and nitric acid mixed solution, nitric acid plays corrosive attack, and this is an electrochemical reaction process: the crystal grain in Metal and Alloy is different from the physicochemical property between intergranule, intracrystalline and crystal boundary and each phase, and has different free energys.When metal is subject to natal etch, can there is electrochemical reaction, now nitric acid can be described as electrolyte solution.Because metal respectively has different electrode potentials in salpeter solution, form many micro cells, compared with electronegative potential part, be the anode of micro cell, dissolve comparatively fast, therefore, dissolve very soon abrasive particle and the metal filings particle stayed on flour milling.Before polishing, increased after rare nital etch, polishing effect, the polishing efficiency of sample are much improved.
To sum up, this metallographic specimen preparation method simple and fast, by increasing nital etch operation, dissolve abrasive particle and the metal filings particle stayed on flour milling before polishing, sample after polishing can not leave obvious polishing scratch, has improved the polishing effect of metallographic specimen; The polishing time of sample is shorter than original, has improved polishing efficiency.
Disclosed is above only several specific embodiment of the present invention, and still, the present invention is not limited thereto, and the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (6)
1. a metallographic specimen preparation method, is characterized in that, concrete steps comprise:
First, metallographic specimen sampling;
Secondly, metallographic specimen is inlayed;
Again, metallographic specimen polishing;
Again, polished acid etch, the flushing of metallographic specimen: treat polished surface and be put into water after nital etch and rinse;
Finally, metallographic specimen polishing.
2. metallographic specimen preparation method according to claim 1, is characterized in that: described metallographic specimen is inlayed in step and selected to inlay according to metallographic specimen size and surfaceness.
3. metallographic specimen preparation method according to claim 1, is characterized in that: in described metallographic specimen polishing step, polishing process is cooling to prevent that sample is overheated and tissue changes to metallographic specimen immersion.
4. according to the metallographic specimen preparation method described in any one in claims 1 to 3, it is characterized in that: the concentration of described nital is 3%～5%.
5. metallographic specimen preparation method according to claim 4, is characterized in that: described nital drops in polished above or whole polished face is put into etch in nital.
6. metallographic specimen preparation method according to claim 4, is characterized in that: the etch time of described nital is 3～5 seconds.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103940655A (en) * | 2014-05-07 | 2014-07-23 | 广西玉柴机器股份有限公司 | Method for preparing high-pressure oil pipe metallographic specimen |
| CN104458741A (en) * | 2014-08-28 | 2015-03-25 | 青岛永通电梯工程有限公司 | Petrographic analysis method of cement clinker |
| CN105300777A (en) * | 2015-11-13 | 2016-02-03 | 广西玉柴机器股份有限公司 | Metallographic specimen and hardness specimen embedding method |
| CN107421797A (en) * | 2017-08-08 | 2017-12-01 | 宝钢集团新疆八钢铁有限公司 | The metallographic rapid detection method of ultra-low carbon cold-rolling plate |
| CN107462437A (en) * | 2017-08-09 | 2017-12-12 | 海盐猛凌汽车配件有限公司 | Rough turn part metallographic specimen sampling method |
| CN108896339A (en) * | 2018-04-04 | 2018-11-27 | 江苏科泰检测技术服务有限公司 | The preparation method of metallographic specimen |
| CN109269867A (en) * | 2018-09-11 | 2019-01-25 | 大连理工大学 | Tungsten nickel iron alloy polishing fluid and alloy surface polishing, metallographic preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940655A (en) * | 2014-05-07 | 2014-07-23 | 广西玉柴机器股份有限公司 | Method for preparing high-pressure oil pipe metallographic specimen |
| CN104458741A (en) * | 2014-08-28 | 2015-03-25 | 青岛永通电梯工程有限公司 | Petrographic analysis method of cement clinker |
| CN105300777A (en) * | 2015-11-13 | 2016-02-03 | 广西玉柴机器股份有限公司 | Metallographic specimen and hardness specimen embedding method |
| CN107421797A (en) * | 2017-08-08 | 2017-12-01 | 宝钢集团新疆八钢铁有限公司 | The metallographic rapid detection method of ultra-low carbon cold-rolling plate |
| CN107462437A (en) * | 2017-08-09 | 2017-12-12 | 海盐猛凌汽车配件有限公司 | Rough turn part metallographic specimen sampling method |
| CN108896339A (en) * | 2018-04-04 | 2018-11-27 | 江苏科泰检测技术服务有限公司 | The preparation method of metallographic specimen |
| CN109269867A (en) * | 2018-09-11 | 2019-01-25 | 大连理工大学 | Tungsten nickel iron alloy polishing fluid and alloy surface polishing, metallographic preparation method |
| CN109269867B (en) * | 2018-09-11 | 2020-12-11 | 大连理工大学 | Tungsten-nickel-iron alloy polishing solution and alloy surface polishing and metallographic phase preparation method |
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