CN107664686A - The detection method of rail core wound - Google Patents
The detection method of rail core wound Download PDFInfo
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- CN107664686A CN107664686A CN201710390228.XA CN201710390228A CN107664686A CN 107664686 A CN107664686 A CN 107664686A CN 201710390228 A CN201710390228 A CN 201710390228A CN 107664686 A CN107664686 A CN 107664686A
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- core
- rail
- field trash
- wound
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/20—Metals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a kind of detection method of rail core wound, including：The broken sample of rail, using mechanical pressure machine, core is hindered into sample at the position for being marked with core wound and broken, observes core impairment of the constitution looks；Electron-microscope scanning, local electron-microscope scanning is carried out to the fracture apperance after breaking, conclude whether be that core caused by field trash is hindered, and analyze the constituent of field trash；Metallographic Analysis, hinder sample to the core after breaking and carry out metallographic structure observation, judge the classification of its field trash, the size of field trash, the quantity of field trash, and whether abnormal organize；Hardness gradient is analyzed, and whether the Crack cause of checking core wound is caused by hardness gradient.The present invention can find out the reason for rail core is hindered, and reference is proposed to production in the future, avoid as far as possible due to caused rail core wound the defects of itself.
Description
Technical field
Smelted the present invention relates to one kind and test and analyze technology, specifically, be related to a kind of detection method of rail core wound.
Background technology
With increasingly harsh to rail use condition on circuit, there is the time of early fatigue hurt in rail and quantity is gradual
Increase, not only endanger the operation of train on circuit, also to later stage track division maintenance etc. work bring unnecessary trouble with
Cost.Detection on rail core wound all focuses on line flaw detection detection, it is therefore intended that the possibility of discovery rail promptly and accurately
Core is hindered, and is repaired or is changed in time, avoids core wound harm.
At present, the sample hindered for having been found that core, does not provide analysis method.
The content of the invention
Technical problem solved by the invention is to provide a kind of detection method of rail core wound, can find out rail core wound
Reason, reference is proposed to production in the future, avoided as far as possible due to caused rail core wound the defects of itself.
Technical scheme is as follows：
A kind of detection method of rail core wound, including：
The broken sample of rail；Using mechanical pressure machine, core is hindered into sample at the position for being marked with core wound and broken, observes the core impairment of the constitution
Looks；
Electron-microscope scanning；Local electron-microscope scanning is carried out to the fracture apperance after breaking, concludes whether be core caused by field trash
Wound, and analyze the constituent of field trash；
Metallographic Analysis；Hinder sample to the core after breaking and carry out metallographic structure observation, judge classification, the field trash of its field trash
Size, the quantity of field trash, and whether tissue abnormal；
Hardness gradient is analyzed, and whether the Crack cause of checking core wound is caused by hardness gradient.
Further：Positioned using ultrasonic examination, flaw detection monocrystalline multi-angle probe detection rail, it is found that core is hindered and alarmed
Afterwards, surface inspection is carried out to the reflecting surface of alarm using minute surface, excludes external influence factors, judge the position of core wound.
Further：Rail head is cut after determining position, core hinders the groove that the opening position flange of rail opens 3mm.
Further：Core impairment of the constitution looks are divided into black core and white nucleus.
Compared with prior art, the technology of the present invention effect includes：
1st, the present invention finds out the reason for rail core is hindered, reference is proposed to production in the future, to the greatest extent by the analysis of effective science
It can be avoided that due to caused rail core wound the defects of itself, reduce the puzzlement of user, extend rail service life.
2nd, the present invention can clearly analyze core and hinder producing cause, and optimization direction is provided for the optimization of optimized production process,
Instruct to avoid the inducement because causing rail defects and failures the defects of itself as far as possible in production, so as to save production cost, improve steel
Field trash inside rail is also beneficial to improve the lumber recovery of rail.
Brief description of the drawings
Fig. 1 is the electron-microscope scanning figure of field trash 1 in the present invention；
Fig. 2 is the energy spectrum diagram of field trash 1 in the present invention；
Fig. 3 is the electron-microscope scanning figure of field trash 2 in the present invention；
Fig. 4 is the energy spectrum diagram of field trash 2 in the present invention.
Fig. 5 is the electron-microscope scanning figure of sample 1 in the present invention；
Fig. 6 is the energy spectrum diagram that sample 1 is pressed from both sides in the present invention；
Fig. 7 is the inclusion analysis figure of sample 1 in the present invention；
Fig. 8 is the inclusion analysis figure of sample 2 in the present invention；
Fig. 9 is that the core of sample 1 and sample 2 hinders sample rockwell hardness testing figure in the present invention.
Embodiment
Technical solution of the present invention is elaborated below with reference to example embodiment.However, example embodiment can
Implement in a variety of forms, and be not understood as limited to embodiment set forth herein；On the contrary, these embodiments are provided so that
The design of example embodiment more comprehensively and completely, and is comprehensively communicated to those skilled in the art by the present invention.
The detection method of rail core wound is accurately positioned based on these on the basis of means of core wound, and follow-up break is carried out to it
Open and analyze.Four sample, ESEM, metallographic structure, hardness gradient detection means are taken brokenly, analyze core wound examination in all directions
Sample, finally provide to form the reason for core is hindered.
Step 1：The broken sample of rail；
Positioned using ultrasonic examination.Monocrystalline multi-angle of detecting a flaw probe detection rail, it is found that after core is hindered and alarmed, use mirror
Reflecting surface in face of alarm carries out surface inspection, excludes external influence factors, judges the position of core wound.Determine rail head behind position
Cut, core hinders the groove that the opening position flange of rail opens 3mm.
Using mechanical pressure machine, core is hindered into sample at the position for being marked with core wound and broken, observes core impairment of the constitution looks, preliminary judgement
The Crack cause of core wound.Now break core and hinder sample if core is hindered, the basic pattern of core wound, the typical core impairment of the constitution can be showed
Looks are divided into black core and white nucleus.
As described in Figure 1, it is the electron-microscope scanning figure of field trash 1 in the present invention；As shown in Fig. 2 it is field trash 1 in the present invention
Energy spectrum diagram.
Step 2：Electron-microscope scanning；
Accurate careful local electron-microscope scanning is carried out to the fracture apperance after breaking, tentatively concludes whether be that field trash causes
Core wound, and analyze the constituent of field trash.
Step 3：Metallographic Analysis；
Hinder sample to the core after breaking and carry out deep metallographic structure observation, judge the classification of its field trash, field trash
Size and field trash number, the factors such as whether tissue abnormal.
Step 4：Hardness gradient.
Further verify the Crack cause of core wound whether due to caused by hardness gradient.
1st, the Electronic Speculum of white nucleus and energy spectral test.
The core wound of white nucleus is in metallochrome, does not contact and aoxidizes with the external world.Using scanning electron microscopic observation fracture apperance,
Find to be mingled with two in fracture source region, the main component of energy spectrum analysis field trash is respectively C (5.64%), O (41.51%), Na
(7.20%), Mg (7.20%), S (7.93%), Ca (13.18%), Fe (12.35%).
As described in Figure 3, it is the electron-microscope scanning figure of field trash 2 in the present invention；As shown in figure 4, it is field trash 2 in the present invention
Energy spectrum diagram.
The main component of energy spectrum analysis field trash is respectively C (6.97%), O (14.04%), Al (1.27%), Si
(5.18%), Ca (5.42%), La (13.3%), Ce (25.72%), Fe (26.7%).
Analyze to be mingled with two and understand, stress concentration is caused by field trash during rail use, cracks source, is formed
Core is hindered.
2nd, black nuclear power mirror and energy spectral test.
Carried out by the outward appearance hindered to core it has been observed that rail is curve silent partners, the gravity by wheel and centrifugation online
Power double action, very big cyclic loading is received at the fillet of inner side, in this case, rail easily produces shear crack, rail head
The change of pattern.The pattern of core wound is hindered into two horizontal planes, at fillet with core to be connected, and analyzes the horizontal stroke to curve track due to wheel
Cause deformation of rail to horizontal force, outside shear crack, deform to rail in-house development, produced in the presence of field trash
Core is hindered.
As shown in figure 5, it is the electron-microscope scanning figure of sample 1 in the present invention；As shown in fig. 6, it is the energy that sample 1 is pressed from both sides in the present invention
Spectrogram.
Using scanning electron microscopic observation fracture apperance, there is field trash in fracture origin, the main component of field trash is C
(18.81%), O (40.26%), Ca (37.86%), Fe (3.07%).By fracture and energy spectrum analysis, by outside fine fisssure
Line inwardly develops, and fracture origin is produced at rail inner clamps debris, and then forms core wound.
3rd, inclusion analysis.
As shown in fig. 7, it is the inclusion analysis figure of sample 1 in the present invention；As shown in figure 8, it is the field trash of sample 2 in the present invention
Analysis chart.
Inclusion analysis shows that sample 1 (Baogang's U75V rail) inclusion behavior is higher, and Large Inclusions are more, and
It was found that the mixing field trash for having more than 3 grades is present；The inclusion behavior of sample 2 (climbing steel U75V) is relatively low.
Take fir to practise physiognomy to Baogang's U75V cores injury and carry out field trash inspection, steel U75V is climbed due to not finding that core is hindered, from rail head
Inclusion analysis is carried out at the downward 15mm of fillet, such as table 1.
The Baogang of table 1, climb the inspection of steel U75V field trashes
As shown in figure 9, it is that the core of sample 1 and sample 2 hinders sample rockwell hardness testing figure in the present invention.
From finding that the hardness near two kinds of rail core wounds is average, it is not found soft spots or points hardness is higher
Situation occurs, specific data such as table 2.
Baogang's U75V, U76CrRE core of table 2 hinders sample Rockwell hardness
Rail core hinders analysis of causes conclusion
1st, from the point of view of result of detection, Baogang's U75V, U76CrRE rail is not with climbing after steel U75V rail cores injury presses off
Core wound all be present.Analysis is because circuit flaw detection uses flaw detection trolley, and maintenance personnel is ensure that rail is safe for operation, by the spirit of probe
Higher, typically 2 times of manufacturing requirements, the therefore even if level of inclusions of rail reaches production of sensitivity rank adjusting
The standard of inspection, circuit flaw detection still can alarm.
2nd, from the point of view of Electronic Speculum and EDAX results, production core the reason for hindering, mainly there is two kinds, and one kind is merely to be mingled with
Thing is hindered as core caused by fracture origin, is inwardly extended by the change of rail head pattern, micro-crack etc. in addition, in rail inner clamps debris
Position produce fracture origin, formed core wound.This wound of the core as caused by wound is how relevant with the road conditions of circuit and maintenance.
3rd, from the point of view of the comparison result that this field trash is examined, steel U75V inclusion behaviors compared with Baogang's U75V rail are climbed
Low, quantity is few.
Term used herein is explanation and exemplary and nonrestrictive term.Because the present invention can be with a variety of
Form specific implementation without departing from the spiritual or substantive of invention, it should therefore be appreciated that above-described embodiment be not limited to it is any foregoing
Details, and should widely being explained in the spirit and scope that appended claims are limited, thus fall into claim or its etc.
Whole changes and remodeling in the range of effect all should be appended claims and covered.
Claims (4)
1. a kind of detection method of rail core wound, including：
The broken sample of rail；Using mechanical pressure machine, core is hindered into sample at the position for being marked with core wound and broken, observes core impairment of the constitution looks；
Electron-microscope scanning；Local electron-microscope scanning is carried out to the fracture apperance after breaking, concludes whether be that core caused by field trash is hindered, and
And the constituent of analysis field trash；
Metallographic Analysis；Hinder sample to the core after breaking and carry out metallographic structure observation, judge the classification of its field trash, field trash it is big
Whether small, field trash quantity, and tissue are abnormal；
Hardness gradient is analyzed, and whether the Crack cause of checking core wound is caused by hardness gradient.
2. the detection method of rail core wound as claimed in claim 1, it is characterised in that：Positioned using ultrasonic examination, flaw detection is single
Brilliant multi-angle probe detection rail, it is found that after core is hindered and alarmed, surface inspection is carried out to the reflecting surface of alarm using minute surface, excluded
External influence factors, judge the position of core wound.
3. the detection method of rail core wound as claimed in claim 2, it is characterised in that：Rail head is cut after determining position, core wound
The opening position flange of rail opens 3mm groove.
4. the detection method of rail core wound as claimed in claim 1, it is characterised in that：Core impairment of the constitution looks are divided into black core and white nucleus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710390228.XA CN107664686A (en) | 2017-05-27 | 2017-05-27 | The detection method of rail core wound |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710390228.XA CN107664686A (en) | 2017-05-27 | 2017-05-27 | The detection method of rail core wound |
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| CN107664686A true CN107664686A (en) | 2018-02-06 |
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| CN201710390228.XA Pending CN107664686A (en) | 2017-05-27 | 2017-05-27 | The detection method of rail core wound |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109142373A (en) * | 2018-08-14 | 2019-01-04 | 武汉钢铁有限公司 | The Microstructural Analysis of high speed heavy rail " black line " class Classifcation of flaws and depth |
| CN114323838A (en) * | 2021-12-06 | 2022-04-12 | 包头钢铁（集团）有限责任公司 | Analysis method of flaw detection alarm steel rail |
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| CN103235100A (en) * | 2013-04-16 | 2013-08-07 | 内蒙古包钢钢联股份有限公司 | Longitudinal-transverse type core wound rail sampling and fracture analysis method |
| CN104166068A (en) * | 2014-08-07 | 2014-11-26 | 国家电网公司 | Electric system steel-cored aluminum strand failure analysis method |
| CN104807667A (en) * | 2015-04-30 | 2015-07-29 | 内蒙古包钢钢联股份有限公司 | Analytical sampling and analytical method for failure of H-section steel |
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| CN103235100A (en) * | 2013-04-16 | 2013-08-07 | 内蒙古包钢钢联股份有限公司 | Longitudinal-transverse type core wound rail sampling and fracture analysis method |
| CN104166068A (en) * | 2014-08-07 | 2014-11-26 | 国家电网公司 | Electric system steel-cored aluminum strand failure analysis method |
| CN104807667A (en) * | 2015-04-30 | 2015-07-29 | 内蒙古包钢钢联股份有限公司 | Analytical sampling and analytical method for failure of H-section steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109142373A (en) * | 2018-08-14 | 2019-01-04 | 武汉钢铁有限公司 | The Microstructural Analysis of high speed heavy rail " black line " class Classifcation of flaws and depth |
| CN114323838A (en) * | 2021-12-06 | 2022-04-12 | 包头钢铁（集团）有限责任公司 | Analysis method of flaw detection alarm steel rail |
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Application publication date: 20180206 |