CN103759993B - Metallographic specimen preparation method - Google Patents
Metallographic specimen preparation method Download PDFInfo
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- CN103759993B CN103759993B CN201310750149.7A CN201310750149A CN103759993B CN 103759993 B CN103759993 B CN 103759993B CN 201310750149 A CN201310750149 A CN 201310750149A CN 103759993 B CN103759993 B CN 103759993B
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Abstract
The invention discloses a kind of metallographic specimen preparation method.This metallographic specimen preparation method concrete steps comprise: first, and metallographic specimen samples; Secondly, metallographic specimen is inlayed; Again, metallographic specimen polishing; Again, polished acid etch of metallographic specimen, flushing: treat after polished surface is put into nital etch and rinse with water; Finally, metallographic specimen polishing.This metallographic specimen preparation method simple and fast, by increasing nital etch operation before polishing, dissolve and stay abrasive particle on flour milling and metal filings particle, the sample after polishing can not leave obvious polishing scratch, improves the polishing effect of metallographic specimen; The polishing time of sample is shorter than original, improves polishing efficiency.
Description
Technical field
The present invention relates to material microstructure detection field, particularly a kind of metallographic specimen preparation method.
Background technology
The inspection of metallographic microstructure needs just can test forming metallographic specimen after exemplar polishing, the quality of quality of finish directly has influence on test effect, the object of sample polishing is to remove the polishing scratch that sample flour milling stays, the surface obtaining seemingly minute surface, for display organization is ready.
------sample polishing---sample polishing that sample is inlayed (exemplar too little or when having a particular/special requirement) that common metallographic specimen preparation flow is: sample sampling (cutting).After above a few procedure, exemplar face to be checked reaches the inspection that luminance brightness just can carry out 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, impact is had on the judgement of metal lographic examination result.
Summary of the invention
The present invention is to overcome defect in above-mentioned prior art, provides a kind of simple and fast, increases nital etch operation before polishing, the polishing effect improving metallographic specimen, the metallographic specimen preparation method that improve 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 of metallographic specimen, flushing: treat after polished surface is put into nital etch and rinse with water;
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 to be organized to prevent sample overheated metallographic specimen immersion cooling and is changed.
In technique scheme, the concentration of nital is 3% ~ 5%.
In technique scheme, nital drops in polished and goes up 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 increasing nital etch operation before polishing, dissolve and stay abrasive particle on flour milling and metal filings particle, sample after polishing can not leave obvious polishing scratch, improves the polishing effect of metallographic specimen; The polishing time of sample is shorter than original, improves polishing efficiency.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of metallographic specimen preparation method of the present invention.
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 not by the restriction of embodiment.It will be appreciated that, mentioned in following embodiment of the present invention " on ", D score, "left", "right", " front " and " reverse side " all with the direction shown in each figure for benchmark, these words being used for limiting direction are only used to be convenient to illustrate, 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 increasing nital etch operation before polishing, dissolve and stay abrasive particle on flour milling and metal filings particle, the sample after polishing can not leave obvious polishing scratch, improves the polishing effect of metallographic specimen; The polishing time of sample is shorter than original, improves polishing efficiency.
Be described through citing but unrestriced mode describes the disclosure in detail below, should be understood that various aspect of the present disclosure can by independent realization or the realization be combined with other aspects.This instructions clearly enables those skilled in the art to manufacture and uses us to believe for new and non-obvious improvement, describe the application of some embodiments, alternative, modification, alternatives and system, comprise the current best mode being considered to perform the inventive principle described in this instructions.When describing element or feature and/or embodiment, be intended to represent that to have in element or feature one or more titled with " one " " one " " being somebody's turn to do " and " described ".Term " comprises " " comprising " and " having " is intended to be comprising property, and represents also have extra element or feature beyond 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 (exemplar too little or when having a particular/special requirement) that this metallographic specimen preparation method flow process is: sample sampling (cutting), namely, after the exemplar sample polishing of original metallographic sample preparation flow process, increase by one acid etch operation before polishing, its concrete steps comprise:
First, metallographic specimen sampling;
Intercepting sample at representational position, preventing sample from occurring in intercepting process during intercepting overheated, in order to avoid sample tissue changes because being heated; The special surface protecting sample should be noted when 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, do not allow to damage because of intercepting.
Secondly, metallographic specimen is inlayed;
Select to inlay according to metallographic specimen size and surface treatment situation, comparatively large or surface does not have can inlaying of particular/special requirement as samples, and particular/special requirement comprises: surface roughness requirements.
Again, metallographic specimen polishing;
Polish metallographic face to be detected, polishing process to be organized to prevent sample overheated metallographic specimen immersion cooling and is changed.
Again, polished acid etch of metallographic specimen, flushing;
Polished instills the nital (alcohol and nitric acid mixed solution) of several 3% ~ 5%, etch in the nital that whole polished face also can be made to be put into 3% ~ 5%, the etch time is use water sample wash after 3 ~ 5 seconds, and the infusion volume of nital makes polished face be dipped into just can.
Finally, metallographic specimen polishing;
To the polished mirror polish after flushing, clearly, polishing time is fewer than original, and polished surface does not have obvious visible polishing scratch for polishing effect.
Because metal is in polishing process, the abrasive particle come off and metal filings particulate fraction are stayed on sample flour milling, directly rinse with water and without the etch of nitric acid alcohol time, abrasive particle and metal filings particle are washed off not exclusively and remain 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, can produce direct impact to assay.If after sample polishing, with polishing again after the nital etch of 3 ~ 5%, clearly, polishing velocity is fast, and can not produce new cut for polishing effect.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 between crystal grain, intracrystalline and crystal boundary and each mutually between physicochemical property different, and there is different free energys.When metal is subject to natal etch, electrochemical reaction can occur, now nitric acid can be described as electrolyte solution.Because metal respectively has different electrode potentials in salpeter solution, forming many micro cells, is the anode of micro cell compared with electronegative potential part, dissolves very fast, therefore, dissolves very soon and stays abrasive particle on flour milling and metal filings particle.After adding rare nital etch before polishing, 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 before polishing, dissolving and staying abrasive particle on flour milling and metal filings particle, sample after polishing can not leave obvious polishing scratch, improves the polishing effect of metallographic specimen; The polishing time of sample is shorter than original, improves polishing efficiency.
Be only several specific embodiment of the present invention above, but the present invention is not limited thereto, 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 of metallographic specimen, flushing: treat after polished surface is put into nital etch and rinse with water;
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, and polishing process to be organized to prevent sample overheated metallographic specimen immersion cooling and changed.
4. metallographic specimen preparation method according to any one of claim 1 to 3, 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 and goes up 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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Families Citing this family (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 |
| 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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