CN108254297A - The assay method of high-carbon steel autstenitic grain size - Google Patents
The assay method of high-carbon steel autstenitic grain size Download PDFInfo
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- CN108254297A CN108254297A CN201810184821.3A CN201810184821A CN108254297A CN 108254297 A CN108254297 A CN 108254297A CN 201810184821 A CN201810184821 A CN 201810184821A CN 108254297 A CN108254297 A CN 108254297A
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- grain size
- carbon steel
- temperature
- assay method
- autstenitic grain
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- 229910000677 High-carbon steel Inorganic materials 0.000 title claims abstract description 27
- 238000003556 assay Methods 0.000 title claims abstract description 15
- 239000011261 inert gas Substances 0.000 claims abstract description 7
- 238000002791 soaking Methods 0.000 claims abstract description 7
- 229910001566 austenite Inorganic materials 0.000 claims description 13
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 229910017435 S2 In Inorganic materials 0.000 claims 1
- 238000011156 evaluation Methods 0.000 abstract description 2
- 238000005088 metallography Methods 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000003486 chemical etching Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 235000019628 coolness Nutrition 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means
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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating And Analyzing Materials By Characteristic Methods (AREA)
Abstract
The invention discloses a kind of assay method of high-carbon steel autstenitic grain size, including step：S1, sample is positioned in the crucible of superhigh temperature laser confocal microscope, inert gas is filled with after vacuumizing；S2, sample is heated, and is kept the temperature after set temperature is heated to, until soaking time reaches setting value；S3, by superhigh temperature confocal laser scanning microscope high-carbon steel autstenitic grain size, and the size of high-carbon steel autstenitic grain size is measured.The assay method of the high-carbon steel autstenitic grain size of the present invention, by way of high-temperature metallography, under the high temperature conditions, directly obtains and observes high-carbon steel autstenitic grain size, and with this quantitative assessment grain size, the accuracy height of evaluation result.
Description
Technical field
The invention belongs to metal material microstructure detection technique field, specifically, the present invention relates to a kind of high-carbon steel
The assay method of autstenitic grain size.
Background technology
Austenite is a kind of microscopic structure in steel, generally equiaxial polygon crystal grain, and austenite grain size will influence
The size and structure organized after follow-up tissue inter-variable, and then influence the mechanical performance of material.Austenite is high temperature in iron-carbon diagram
Phase, is present in more than critical point A1 temperature, the tissue in austenite cooling procedure after phase transformation can only be observed under room temperature, due to height
Carbon steel is not precipitated enough along austenite during cooling phase-change and reticulates the ferrite of distribution, therefore cannot be straight under room temperature
Observation austenite grain size is connect, it is general to use sample reaustenitizing and be quickly cooled down acquisition martensitic structure, then into
The method of row chemical etching, since austenite grain boundary impurity element is on the high side, under normal circumstances, with intra-die martensitic phase than excellent
First etch, therefore austenite grain boundary can be obtained with chemical etching method.But for the metal material of unlike material, chemical etching
Method is not fully applicable in, and can not obtain satisfactory etch effect sometimes.Therefore it needs to establish a kind of applicable measure
The test method of high-carbon steel autstenitic grain size size.
Invention content
The present invention is directed at least solve one of technical problem in the prior art.For this purpose, present invention offer is a kind of high
The assay method of carbon steel autstenitic grain size, it is therefore an objective to realize the measure of high-carbon steel autstenitic grain size size.
To achieve these goals, the technical solution taken of the present invention is：The assay method of high-carbon steel autstenitic grain size,
Including step：
S1, sample is positioned in the crucible of superhigh temperature laser confocal microscope, inert gas is filled with after vacuumizing；
S2, sample is heated, and is kept the temperature after set temperature is heated to, until soaking time reaches setting
Value；
S3, by superhigh temperature confocal laser scanning microscope high-carbon steel autstenitic grain size, and to high-carbon steel austenite
The size of grain size measures.
In the step S1, it needs first to be polished sample, sample then is positioned over superhigh temperature laser co-focusing shows
In the crucible of micro mirror, crucible is placed in the heating furnace of superhigh temperature laser confocal microscope.
In the step S1, inert gas is argon gas.
In the step S2, sample is heated to austenitizing, the set temperature is 800~900 DEG C.
In the step S2, the set temperature is 850 DEG C.
In the step S2, the setting value of soaking time is 300~600 seconds.
The assay method of the high-carbon steel autstenitic grain size of the present invention, by way of high-temperature metallography, under the high temperature conditions,
It directly obtains and observes high-carbon steel autstenitic grain size, and with this quantitative assessment grain size, the accuracy of evaluation result
It is high.
Description of the drawings
This specification includes the following drawings, and shown content is respectively：
Fig. 1 is heating curves schematic diagram in the embodiment of the present invention；
Fig. 2 is austenite grain observed result figure in the embodiment of the present invention.
Specific embodiment
Below against attached drawing, by the description of the embodiment, making to the specific embodiment of the present invention further details of
Explanation, it is therefore an objective to those skilled in the art be helped to have to inventive concept of the invention, technical solution more complete, accurate and go deep into
Understanding, and contribute to its implementation.
The present invention provides a kind of assay method of high-carbon steel autstenitic grain size, including the steps：
S1, sample is positioned in the crucible of superhigh temperature laser confocal microscope, inert gas is filled with after vacuumizing；
S2, sample is heated, and is kept the temperature after set temperature is heated to, until soaking time reaches setting
Value；
S3, by superhigh temperature confocal laser scanning microscope high-carbon steel autstenitic grain size, and to high-carbon steel austenite
The size of grain size measures.
Specifically, in above-mentioned steps S1, need first to be polished sample, sample is then positioned over superhigh temperature laser
In the crucible of Laser Scanning Confocal Microscope, crucible is placed in the heating furnace of superhigh temperature laser confocal microscope.Superhigh temperature laser is copolymerized
As well known in the skilled person, details are not described herein for the structure of focusing microscope.Sample is polished, is helped
In the accuracy for improving measurement result.
In above-mentioned steps S1, inert gas is argon gas.In the heating stove evacuation of superhigh temperature laser confocal microscope
Afterwards, argon gas is filled with into heating furnace, sample is made to be heated under protective atmosphere, helps to improve the accuracy of measurement result.
In above-mentioned steps S2, sample is heated to austenitizing, set temperature is 800~900 DEG C, is material austenite
Change temperature.In above-mentioned steps S2, set temperature is preferably 850 DEG C, and the rate of heat addition is 5 DEG C/sec, and the setting value of soaking time is excellent
It is selected as 300~600 seconds, helps to improve the accuracy of measurement result.
Since the selective evaporation or distillation of grain boundaries atom, crystal boundary gradually show during being kept the temperature to sample,
Observation can be carried out after Display of Grain Boundary is clear with measuring the size of high-carbon steel autstenitic grain size.
Embodiment one
In the present embodiment, sample is 82B wire rods, and testing equipment is VL2000DX-SVF17SP superhigh temperature laser co-focusings
Microscope.The vacuum degree of superhigh temperature laser confocal microscope is 10-2Pa, and heating temperature can be to 1700 DEG C, temperature control precision
At 0.1 DEG C, maximum heating speed is up to 1000 DEG C/min, and maximum cooling rate is up to 100 DEG C/s (He air coolings).
Sample selects 82B wire rods, the cylindrical structure that sample is a diameter of 8 millimeters and height is 3 millimeters, by sample one side
It polishes and polishes, be put into the special copple of superhigh temperature laser confocal microscope, argon atmosphere is passed through after vacuumizing.Add
Near heat examination sample to 850 DEG C of austenitizing temperatures, ten minutes are kept the temperature, crystal boundary is gradually clear, after Display of Grain Boundary is complete, addition mark
Reserve sample photo after ruler.Finally crystallite dimension is measured according to scale, crystallite dimension 18.5um.
The present invention is exemplarily described above in association with attached drawing.Obviously, present invention specific implementation is not by above-mentioned side
The limitation of formula.As long as employ the improvement of the various unsubstantialities of inventive concept and technical scheme of the present invention progress；Or not
It is improved, the above-mentioned design of the present invention and technical solution are directly applied into other occasions, in protection scope of the present invention
Within.
Claims (6)
1. the assay method of high-carbon steel autstenitic grain size, which is characterized in that including step：
S1, sample is positioned in the crucible of superhigh temperature laser confocal microscope, inert gas is filled with after vacuumizing；
S2, sample is heated, and is kept the temperature after set temperature is heated to, until soaking time reaches setting value；
S3, by superhigh temperature confocal laser scanning microscope high-carbon steel autstenitic grain size, and to high-carbon steel austenite grain
The size of degree measures.
2. the assay method of high-carbon steel autstenitic grain size according to claim 1, which is characterized in that in the step S1
In, it needs first to be polished sample, then be positioned over sample in the crucible of superhigh temperature laser confocal microscope, crucible is placed in
In the heating furnace of superhigh temperature laser confocal microscope.
3. the assay method of high-carbon steel autstenitic grain size according to claim 1 or 2, which is characterized in that in the step
In rapid S1, inert gas is argon gas.
4. the assay method of high-carbon steel autstenitic grain size according to any one of claims 1 to 3, which is characterized in that in institute
It states in step S2, sample is heated to austenitizing, the set temperature is 800~900 DEG C.
5. the assay method of high-carbon steel autstenitic grain size according to claim 4, which is characterized in that in the step S2
In, the set temperature is 850 DEG C.
6. the assay method of high-carbon steel autstenitic grain size according to any one of claims 1 to 5, which is characterized in that in institute
It states in step S2, the setting value of soaking time is 300~600 seconds.
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| CN201810184821.3A CN108254297A (en) | 2018-03-07 | 2018-03-07 | The assay method of high-carbon steel autstenitic grain size |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916787A (en) * | 2019-04-02 | 2019-06-21 | 鞍钢股份有限公司 | Method for measuring austenite grain size of spring steel wire rod by using oxidation method |
| CN110726651A (en) * | 2019-10-25 | 2020-01-24 | 成都先进金属材料产业技术研究院有限公司 | Method for observing gas valve steel granular carbide at high temperature in situ |
| CN112378823A (en) * | 2020-11-11 | 2021-02-19 | 成都先进金属材料产业技术研究院有限公司 | Method for displaying twin-crystal-free structure grain size of austenitic stainless steel after solid solution |
| CN112525755A (en) * | 2020-11-23 | 2021-03-19 | 东北大学 | Test and application method of acicular ferrite nucleation growth rule in welding process |
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| CN101413786A (en) * | 2008-11-28 | 2009-04-22 | 首钢总公司 | Method for measuring austenite crystal dimension by high temperature laser microscope |
| CN103257098A (en) * | 2013-05-16 | 2013-08-21 | 江苏省沙钢钢铁研究院有限公司 | High-carbon steel wire rod austenite grain size measurement method |
| CN104596901A (en) * | 2015-01-09 | 2015-05-06 | 江苏省沙钢钢铁研究院有限公司 | Method for measuring austenite grain size |
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2018
- 2018-03-07 CN CN201810184821.3A patent/CN108254297A/en active Pending
Patent Citations (3)
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| CN101413786A (en) * | 2008-11-28 | 2009-04-22 | 首钢总公司 | Method for measuring austenite crystal dimension by high temperature laser microscope |
| CN103257098A (en) * | 2013-05-16 | 2013-08-21 | 江苏省沙钢钢铁研究院有限公司 | High-carbon steel wire rod austenite grain size measurement method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916787A (en) * | 2019-04-02 | 2019-06-21 | 鞍钢股份有限公司 | Method for measuring austenite grain size of spring steel wire rod by using oxidation method |
| CN110726651A (en) * | 2019-10-25 | 2020-01-24 | 成都先进金属材料产业技术研究院有限公司 | Method for observing gas valve steel granular carbide at high temperature in situ |
| CN112378823A (en) * | 2020-11-11 | 2021-02-19 | 成都先进金属材料产业技术研究院有限公司 | Method for displaying twin-crystal-free structure grain size of austenitic stainless steel after solid solution |
| CN112525755A (en) * | 2020-11-23 | 2021-03-19 | 东北大学 | Test and application method of acicular ferrite nucleation growth rule in welding process |
| CN112525755B (en) * | 2020-11-23 | 2021-10-29 | 东北大学 | Test and application method of acicular ferrite nucleation growth rule in welding process |
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Address after: 243003 8 Jiuhua Road, Yushan, Ma'anshan, Anhui Applicant after: Ma'anshan Iron and Steel Co., Ltd. Address before: 243003 Intellectual Property Department, Technical Center No. 8, Hunan West Road, Yushan District, Ma'anshan City, Anhui Province Applicant before: Ma'anshan Iron and Steel Co., Ltd. |
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Application publication date: 20180706 |
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