CN102636488A - Quantitative measurement method for sorbite content in high-carbon steel rod - Google Patents
Quantitative measurement method for sorbite content in high-carbon steel rod Download PDFInfo
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- CN102636488A CN102636488A CN201210124657XA CN201210124657A CN102636488A CN 102636488 A CN102636488 A CN 102636488A CN 201210124657X A CN201210124657X A CN 201210124657XA CN 201210124657 A CN201210124657 A CN 201210124657A CN 102636488 A CN102636488 A CN 102636488A
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Abstract
The invention discloses a quantitative measurement method for sorbite content. The quantitative measurement method comprises the following steps of: cutting a cross section sample of the rod, performing the procedures of inlaying, grinding and polishing on the cross section sample to obtain a metallographical smooth face, etching the smooth face by nital, and then drying the smooth face; determining a monitoring point on the cross section sample of the rod; taking several continuous view fields with the magnification times being 500 on the monitoring point and taking metallographical photos; opening the metallographical photos through PhotoShop software, and computing the number b of intersection points of sorbite by virtue of the software sublines, thereby obtaining the sorbite content through dividing a total number z of the intersection points by the number b; and continuously measuring the sorbite contents in the several metallographical photos and computing the average value of the sorbite contents, which is taken as the sorbite content of the whole cross section of the rod. According to the method, when the digital photos and the software sublines are used for the quantitative measurement, the photos can be magnified at any time to perform structure confirmation, thereby ensuring the accuracy and repeatability of measurement results, and reducing the differences due to personal factors.
Description
Technical field
The present invention relates to a kind of measuring method, refer to a kind of sorbite content quantitative measuring method in the high-carbon steel wire rod that is applied to particularly.
Background technology
Sorbite is a kind of fine pearlite, its same lamellar structure tissue that belongs to pearlite, and just the about 0.08um of cemetite lamellae spacing in the sorbite is to 0.15um, and about 0.15um is to 0.45um for pearlite sheet spacing.Therefore, numerical aperture greater than 50 times of object lens of 0.65 under, pearlite can be seen lamellar structure clearly, sorbite can not be told lamellar structure.Under optical microscope, can judge pearlite and sorbite tissue according to this principle.Pearlite and two kinds of structure organizations of sorbite are also only arranged in the high-carbon steel wire rod.
Sorbite content is the vital tissue index of high-carbon hypereutectoid steel wire rod, in drawing process, keeps homogeneous deformation because more sorbite can guarantee wire rod, the difficult fracture.
Quantitative metallography is according to the stereology principle, and the two-dimentional parameter that is gone out by measurements and calculations on the metallographic specimen flour milling is confirmed the metallographic measuring method of thing phase volume percentage in the three dimensions.Mensuration for the thing phase content; Can adopt the grid number point method of manual quantitative metallography and the image analyzer mensuration of robotization, like People's Republic of China's iron and steel industry industry standard " YB/T169-2000 high-carbon steel wire rod sorbite content metallographic detection method ".
Manual quantitative metallography grid number point method adopts the glass sheet or the plastic sheet of prefabricated band grid to cover on microscopic fields of view or the metallograph, and image can't amplify to be checked, is prone in the time of several make a mistake.The image analyzer mensuration needs professional software and supporting camera system, has high input, and needs staff training, and there is high, the artificial shortcoming that gets involved difficulty of sampling requirement in image analyzer.For the measurement of sorbite content, image analyzer can't accurately be separated the pearlitic structure of choosing lamellar structure according to the threshold values of gray level image, therefore can not carry out accurate quantitative measurment.
Summary of the invention
The object of the invention will overcome the existing in prior technology deficiency exactly, and a kind of high-carbon steel wire rod sorbite content quantitative measuring method is provided, and may further comprise the steps:
1) intercepting wire rod xsect sample obtains the metallographic flour milling after inlaying, grind, polishing, and dries up after the etch of employing nital;
2) on wire rod xsect sample, five equilibrium is appointed and is got 4 points on the circumference at 1/4th diameter places, wire rod center, get sorbite content minimum a bit as check point;
3) adopt metaloscope, on check point, get the visual field of several enlargement factors 500～1000 continuously, take metallograph with digital photographing function;
4) metallograph is opened with PhotoShop software, done the boost line of many quadratures at the software intermediate reach, number is grown the boost line number of hits a on the sorbite in metallograph, and a is promptly obtained sorbite content divided by the sum of boost line intersection point;
5) sorbite content in captured several the metallographs of continuous coverage is obtained the sorbite content value of its mean value as entire cross section.
Preferably, in step 1), adopting mass percent concentration is that 2～5% nital etches dried up after 5～15 seconds.
Preferably, in step 3), on check point, get the visual field of 5～8 enlargement factors 500～1000 continuously, take metallograph, and in step 5), 5～8 captured metallographs are measured.
Preferably, in step 4), equidistantly do the boost line of 20 quadratures.
Beneficial effect of the present invention: the relative current measuring methods of the present invention, need not the equipment input, new metaloscope all has the digital photographing function, only needs a computer that PhotoShop software is installed and just can realize the function of imager in the past; Need not increases new glass plate in light path, guaranteed that the light intensity of metaloscope and resolution can not change.
Adopt etching method can guarantee under metaloscope, significantly to distinguish sorbite and pearlite; Adopt digital pictures to analyze, traceability is good, can call former check data at any time and analyze once more and confirm; Adopt PhotoShop software boost line to replace the entity grid, can amplify picture at any time like this, analysis site is accurately confirmed, improve the accuracy that detects; Adopt the software boost line can increase the measurement grid arbitrarily, amplify the back grid resolution and can not descend, directly improve the quantity of measurement point, increase statistical significance as a result, make measurement result more accurate.
It is easier, quick that method of the present invention can make sorbite measure, and accelerated testing staff's training process, makes testing result repeatability better.The present invention is applicable to the sorbite content measurement of high-carbon wire rod, can be used as the important supplementary means of sorbite grading, makes measurement result more accurate, reduces the difference that human factor causes.
Description of drawings
Fig. 1 is pearlite and the displayed map of sorbite in software on the metallograph.
Embodiment
Below in conjunction with specific embodiment and accompanying drawing the present invention is made further detailed description.
Only there are two kinds of structure organizations of pearlite and sorbite in the high-carbon steel wire rod sample of being got.
Embodiment 1
1) intercepting wire rod xsect sample obtains the metallographic flour milling after inlaying, grind, polishing, and adopts mass percent 3% nital etch to dry up after 10 seconds;
2) on wire rod xsect sample, five equilibrium is appointed and is got 4 points on the circumference at 1/4th diameter places, wire rod center, this sorbite content of 4 of visual inspection, get sorbite content minimum a bit as check point;
3) adopt metaloscope, on check point, get 5 enlargement factors continuously and be 500 visual field, take metallograph with digital photographing function;
4) metallograph is opened with PhotoShop software; Do the boost line of 20 quadratures at the software intermediate reach, form the grid that total number of hits is z, first number goes out the intersection point of grid and metallographic structure medium pearlite among Fig. 1; Use the dot mark of white in the drawings; Pearlitic number of hits a amounts to 30, deducts pearlitic number of hits a with total number of hits z again, obtains sorbitic number of hits b=400-30=370 in the metallographic structure; Use sorbitic number of hits b divided by total number of hits z at last, measured sorbite content is 370/400=92.5% among Fig. 1;
5) according to sorbite content in 5 captured metallographs of the method continuous coverage of step 4), obtain the sorbite content value of its mean value as entire cross section.
Embodiment 2
1) intercepting wire rod xsect sample obtains the metallographic flour milling after inlaying, grind, polishing, and adopts mass percent 2% nital etch to dry up after 5 seconds;
2) on wire rod xsect sample, five equilibrium is appointed and is got 4 points on the circumference at 1/4th diameter places, wire rod center, this sorbite content of 4 of visual inspection, get sorbite content minimum a bit as check point;
3) adopt metaloscope, on check point, get the visual field of 6 enlargement factors 600 continuously, take metallograph with digital photographing function;
4) metallograph is opened with PhotoShop software; Make the boost line of 20 quadratures at the software intermediate reach, form the grid that total number of hits is z, first number goes out the number of hits a of grid and metallographic structure medium pearlite; Deduct pearlitic number of hits a with total number of hits z again; Obtain sorbitic number of hits b in the metallographic structure, use sorbitic number of hits b at last, promptly obtain sorbite content divided by total number of hits z;
5) sorbite content in captured 6 metallographs of continuous coverage is obtained the sorbite content value of its mean value as entire cross section.
Embodiment 3
1) intercepting wire rod xsect sample obtains the metallographic flour milling after inlaying, grind, polishing, and adopts mass percent 5% nital etch to dry up after 15 seconds;
2) on wire rod xsect sample, five equilibrium is appointed and is got 4 points on the circumference at 1/4th diameter places, wire rod center, this sorbite content of 4 of visual inspection, get sorbite content minimum a bit as check point;
3) adopt metaloscope, on check point, get the visual field of 7 enlargement factors 700 continuously, take metallograph with digital photographing function;
4) metallograph is opened with PhotoShop software; Make the boost line of 25 quadratures at the software intermediate reach, form the grid that total number of hits is z, first number goes out the number of hits a of grid and metallographic structure medium pearlite; Deduct pearlitic number of hits a with total number of hits z again; Obtain sorbitic number of hits b in the metallographic structure, use sorbitic number of hits b at last, promptly obtain sorbite content divided by total number of hits z;
5) sorbite content in captured 7 metallographs of continuous coverage is obtained the sorbite content value of its mean value as entire cross section.
Claims (4)
1. high-carbon steel wire rod sorbite content quantitative measuring method may further comprise the steps:
1) intercepting wire rod xsect sample obtains the metallographic flour milling after inlaying, grind, polishing, and dries up after the etch of employing nital;
2) on wire rod xsect sample, five equilibrium is appointed and is got 4 points on the circumference at 1/4th diameter places, wire rod center, get sorbite content minimum a bit as check point;
3) adopt metaloscope, on check point, get the visual field of several enlargement factors 500～1000 continuously, take metallograph with digital photographing function;
4) metallograph is opened with PhotoShop software; Make the boost line of many quadratures at the software intermediate reach, form the grid that total number of hits is z, first number goes out the number of hits a of grid and metallographic structure medium pearlite; Deduct pearlitic number of hits a with total number of hits z again; Obtain sorbitic number of hits b in the metallographic structure, use sorbitic number of hits b at last, promptly obtain sorbite content divided by total number of hits z;
5) sorbite content in captured several the metallographs of continuous coverage is obtained the sorbite content value of its mean value as entire cross section.
2. high-carbon steel wire rod sorbite content quantitative measuring method according to claim 1 is characterized in that: in step 1), adopting mass percent concentration is that 2～5% nital etches dried up after 5～15 seconds.
3. high-carbon steel wire rod sorbite content quantitative measuring method according to claim 1; It is characterized in that: in step 3); On check point, get the visual field of 5～8 enlargement factors 500～1000 continuously; Take metallograph, and in step 5), 5～8 captured metallographs are measured.
4. high-carbon steel wire rod sorbite content quantitative measuring method according to claim 1 is characterized in that: in step 4), equidistantly do the boost line of 20 quadratures.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102901729A (en) * | 2012-09-05 | 2013-01-30 | 天津钢铁集团有限公司 | Method for quantitative analysis of wire rod sorbite content by using imager standard sample method |
| CN102928275A (en) * | 2012-11-01 | 2013-02-13 | 山西京宇天成科技有限公司 | Neodymium iron boron metallographic analysis sample preparation method |
| CN103616387A (en) * | 2013-12-13 | 2014-03-05 | 武汉钢铁(集团)公司 | Quantitative detection method for spring steel coil strip occluded foreign substance |
| CN103759993A (en) * | 2013-12-31 | 2014-04-30 | 广西玉柴机器股份有限公司 | Metallographic specimen preparation method |
| CN105021532A (en) * | 2015-07-17 | 2015-11-04 | 河北钢铁股份有限公司邯郸分公司 | Method for rapid detection of X70 metallographic structure and structure content |
| CN106442522A (en) * | 2016-06-29 | 2017-02-22 | 内蒙古第机械集团有限公司 | Method for inspecting quality rating of 60Si2CrVAT steel heat treatment |
| CN109839301A (en) * | 2019-03-13 | 2019-06-04 | 国家电网有限公司 | A kind of steel twists the detection method of aerial earth wire extent of corrosion |
| CN110208060A (en) * | 2019-06-14 | 2019-09-06 | 武汉钢铁有限公司 | The method for quickly preparing high-carbon steel Metallographic standard sample |
| CN111398282A (en) * | 2020-04-21 | 2020-07-10 | 广东韶钢松山股份有限公司 | Quantitative analysis method for carbon steel sorbite |
| CN112326296A (en) * | 2020-10-20 | 2021-02-05 | 柳州钢铁股份有限公司 | Sampling method and system suitable for analyzing metallographic structure and Agt performance relation |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102901729A (en) * | 2012-09-05 | 2013-01-30 | 天津钢铁集团有限公司 | Method for quantitative analysis of wire rod sorbite content by using imager standard sample method |
| CN102901729B (en) * | 2012-09-05 | 2015-03-04 | 天津钢铁集团有限公司 | Method for quantitative analysis of wire rod sorbite content by using imager standard sample method |
| CN102928275A (en) * | 2012-11-01 | 2013-02-13 | 山西京宇天成科技有限公司 | Neodymium iron boron metallographic analysis sample preparation method |
| CN103616387A (en) * | 2013-12-13 | 2014-03-05 | 武汉钢铁(集团)公司 | Quantitative detection method for spring steel coil strip occluded foreign substance |
| CN103616387B (en) * | 2013-12-13 | 2016-01-13 | 武汉钢铁(集团)公司 | Spring steel wire rod snotter quantitative detecting method |
| CN103759993B (en) * | 2013-12-31 | 2016-01-13 | 广西玉柴机器股份有限公司 | Metallographic specimen preparation method |
| CN103759993A (en) * | 2013-12-31 | 2014-04-30 | 广西玉柴机器股份有限公司 | Metallographic specimen preparation method |
| CN105021532A (en) * | 2015-07-17 | 2015-11-04 | 河北钢铁股份有限公司邯郸分公司 | Method for rapid detection of X70 metallographic structure and structure content |
| CN106442522A (en) * | 2016-06-29 | 2017-02-22 | 内蒙古第机械集团有限公司 | Method for inspecting quality rating of 60Si2CrVAT steel heat treatment |
| CN109839301A (en) * | 2019-03-13 | 2019-06-04 | 国家电网有限公司 | A kind of steel twists the detection method of aerial earth wire extent of corrosion |
| CN110208060A (en) * | 2019-06-14 | 2019-09-06 | 武汉钢铁有限公司 | The method for quickly preparing high-carbon steel Metallographic standard sample |
| CN111398282A (en) * | 2020-04-21 | 2020-07-10 | 广东韶钢松山股份有限公司 | Quantitative analysis method for carbon steel sorbite |
| CN111398282B (en) * | 2020-04-21 | 2023-03-14 | 广东韶钢松山股份有限公司 | Quantitative analysis method for carbon steel sorbite |
| CN112326296A (en) * | 2020-10-20 | 2021-02-05 | 柳州钢铁股份有限公司 | Sampling method and system suitable for analyzing metallographic structure and Agt performance relation |
| CN112326296B (en) * | 2020-10-20 | 2022-12-27 | 柳州钢铁股份有限公司 | Sampling method and system suitable for analyzing metallographic structure and Agt performance relation |
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Application publication date: 20120815 |