CN107807025A - A kind of method for prefabricating of metal material cycles left life-span specimen surface crackle - Google Patents
A kind of method for prefabricating of metal material cycles left life-span specimen surface crackle Download PDFInfo
- Publication number
- CN107807025A CN107807025A CN201710900029.9A CN201710900029A CN107807025A CN 107807025 A CN107807025 A CN 107807025A CN 201710900029 A CN201710900029 A CN 201710900029A CN 107807025 A CN107807025 A CN 107807025A
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- span
- prefabricating
- metal material
- specimen surface
- prefabricated
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Classifications
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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
-
- 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
- G01N2001/2873—Cutting or cleaving
Abstract
The invention discloses a kind of method for prefabricating of metal material cycles left life-span specimen surface crackle, using carrying out marking by electric spark shaping mill first, it is prefabricated to carry out face crack source, then the test specimen to be measured in prefabricated face crack source is subjected to the prefabricated of metal material cycles left life-span specimen surface crackle by way of testing equipment carries out fatigue crack prefabrication again, using electric spark groove technique, line size precision after electric spark groove technique marking is high, uniformity is good, suitable alternative cycle load meets the requirement of surface fatigue flaw size, substantially increase the validity of experiment, the whole experiment process of this flow is simple to operate, it is convenient and swift, it is easy to grasp control；Whole experiment process does not contact chemicals, pollution-free source.
Description
Technical field
The present invention relates to material mechanical performance testing field, specially a kind of metal material cycles left life-span specimen surface
Crackle method for prefabricating.
Background technology
For key components such as aero-engine turbine disk, compressor disc, rear baffles, its cycles left life-span is that its is important
Mechanical performance index, it is therefore desirable to cycles left life test is carried out to its manufacture material, to determine its damage tolerance design value.
Cycles left life test is after the sample of belt surface formation of crack is precast into the fatigue crack of certain length under certain condition,
The experiment under specified temp and alternate load is until be broken, to obtain the cycles left cycle i.e. experiment side of remanent fatigue life
Method.Because cycles left life-span specimen surface formation of crack requires all very fine, so the processing dimension in face crack source requires special
It is not strict, it is difficult to be processed with Milling Machining or the method for chemical attack；The requirement of cycles left life-span sample fatigue crack size
It is very short, and crackle is very fine, it is not easy that crackle is monitored and controlled, therefore be difficult conventionally prefabricating fatigue crack.
The content of the invention
It is an object of the invention to provide a kind of method for prefabricating of metal material cycles left life-span specimen surface crackle, with
Overcome the deficiencies in the prior art.
To reach above-mentioned purpose, the present invention adopts the following technical scheme that：
A kind of method for prefabricating of metal material cycles left life-span specimen surface crackle, specifically includes following steps：
1), sample to be processed is positioned first；
2) marking, is carried out by electric spark shaping mill, it is prefabricated to carry out face crack source；
3) test specimen to be measured in prefabricated face crack source, is subjected to fatigue crack prefabrication by testing equipment.
Further, specifically, in step 1), ensure closely to paste with fixture locating surface during specimen clamping to be processed
Close.
Further, in step 2), marking is carried out using electric spark shaping mill, is marked with using small-power power, single
Limit depth, the mode repeatedly processed obtain required depth dimensions.
Further, in step 2), specifically using the combination of different edm forming marking technological parameters in sample
Surface is processed, including Q modulating frequencies, electric spark power, processing times, path filling mode, records each group of processing ginseng
Number.
Further, the test specimen by progress face crack source in step 2) after prefabricated is fiery to electricity by universal tool-measuring microscope
Flower shaping marking appearance and size is detected, and has been detected part after appearance and size along the interposition perpendicular to scribe length direction
Put and cut off with wire cutting, the sample after cut-out is inlayed into sample, measures groove depth and remelted layer thickness after corrosion on ESEM.
Further, suitable edm forming marking technological parameter is determined by testing result, and using suitable electricity
Spark forming marking technological parameter processing sample face crack source is prefabricated.
Further, in step 3), treat processing sample and apply different alternative cycle load progress fatigue crack prefabrications,
Uninterrupted observation fatigue crack tip spread scenarios simultaneously, and monitoring at any time and measurement crack length, it is determined that suitable prefabricated fatigue
The test load of crackle.
Compared with prior art, the present invention has technique effect beneficial below：
A kind of method for prefabricating of metal material cycles left life-span specimen surface crackle of the present invention, it is electric fiery using passing through first
Flower forming machine carries out marking, and progress face crack source is prefabricated, and the test specimen to be measured in prefabricated face crack source then is passed through into examination again
The mode for testing equipment progress fatigue crack prefabrication carries out the prefabricated of metal material cycles left life-span specimen surface crackle, using electricity
Spark groove technique, the line size precision after electric spark groove technique marking is high, and uniformity is good, suitable alternative cycle load
The requirement of surface fatigue flaw size is met, substantially increases the validity of experiment, the whole experiment process operation letter of this flow
It is single, it is convenient and swift, it is easy to grasp control；Whole experiment process does not contact chemicals, pollution-free source.
Brief description of the drawings
Fig. 1 is edm forming marking formation of crack cross-sectional view.
Fig. 2 is prefabricated surface fatigue crackle figure.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
A kind of method for prefabricating of metal material cycles left life-span specimen surface crackle, specifically includes following steps：
1), sample to be processed is positioned first；
2) marking, is carried out by electric spark shaping mill, it is prefabricated to carry out face crack source；
3) test specimen to be measured in prefabricated face crack source, is subjected to fatigue crack prefabrication by testing equipment.
Specifically, in step 1), ensure to be brought into close contact with fixture locating surface during specimen clamping to be processed.
In step 2), marking is carried out using electric spark shaping mill, using small-power power, single marking finite depth, more
The mode of secondary processing obtains required depth dimensions, as a result as shown in Figure 1.
In step 2), specifically added using the combination of different edm forming marking technological parameters in specimen surface
Work, including Q modulating frequencies, electric spark power, processing times, path filling mode, record each group of machined parameters.
Then by carry out in step 2) face crack source it is prefabricated after test specimen by universal tool-measuring microscope to electric spark into
Type marking appearance and size is detected, and uses part along perpendicular to the centre position in scribe length direction after having detected appearance and size
Wire cutting is cut off, and the sample after cut-out is inlayed into sample, measures groove depth and remelted layer thickness after corrosion on ESEM.
By testing result, it is determined that suitable edm forming marking technological parameter, and use suitable edm forming
Marking technological parameter processing sample face crack source is prefabricated.
In step 3), treat processing sample and apply different alternative cycle load carrying out fatigue crack prefabrication, at the same not between
Disconnected observation fatigue crack tip spread scenarios, and monitoring at any time and measurement crack length, it is determined that the examination of suitable prefabricating fatigue crack
Load is tested, as a result as shown in Figure 2.
Embodiment, so that TC17 titanium alloy cycles left life-span specimen surface crackles are prefabricated as an example：
Face crack Source size：Length is 0.36 ± 0.05mm, and with central axis, width be 0.15 ± 0.025mm,
Depth is 0.18 ± 0.025mm；Surface fatigue crackle precast length：0.46-0.58mm.
1st, frock is arranged on edm forming marking machine worktable first, alignment tool, specimen clamping existed afterwards
In frock, ensure that sample is brought into close contact and fixed with fixture locating surface；
2nd, marking technique is worked out, marking size is edited in edm forming marking machine marking software：Long 0.36mm, width
0.15mm and path filling mode；
3rd, electric spark technique discharge parameter is determined：Using low current, small pulse width is discharged on specimen surface；
4th, edm forming marking process parameter test：It is TC17 in material, thickness is test technology ginseng on 2mm test plate (panel)
Number, it is determined that the use of electric spark power being 3A, electric discharge pulsewidth 35 μ s, the μ s of electric discharge arteries and veins part 20；
5th, edm forming marking appearance and size is detected with universal tool-measuring microscope, incited somebody to action after having detected appearance and size
Sample inlays sample along being cut off perpendicular to the centre position in scribe length direction with wire cutting, by the sample after cut-out, is being swept after corrosion
Measurement groove depth in Electronic Speculum is retouched, determines that groove size disclosure satisfy that the machined parameters of processing request are by detection：Electric spark
Power is 3A, electric discharge pulsewidth 35 μ s, the μ s of electric discharge arteries and veins part 20；
6th, with selected technological parameter in cycles left life-span specimen surface precrack source；
7th, the cycles left life-span specimen clamping in prefabricated face crack source is ensured into sample on fatigue rig
Axiality is good；
8th, prefabricating fatigue crack is tested：Apply different alternative cycle load on cycles left life-span sample, uninterruptedly
With tool microscope observe and measure crack Propagation length；
9th, prefabricating fatigue crack test load is determined：By monitoring and measuring fatigue crack prefabrication length, it is determined to reach
It is 500MPa to desired test load；
10th, with the prefabricated test load of determination in cycles left life-span specimen surface prefabricating fatigue crack.
Claims (7)
1. a kind of method for prefabricating of metal material cycles left life-span specimen surface crackle, it is characterised in that specifically include following
Step：
1), sample to be processed is positioned first；
2) marking, is carried out by electric spark shaping mill, it is prefabricated to carry out face crack source；
3) test specimen to be measured in prefabricated face crack source, is subjected to fatigue crack prefabrication by testing equipment.
2. a kind of method for prefabricating of metal material cycles left life-span specimen surface crackle according to claim 1, it is special
Sign is, specifically, in step 1), ensures to be brought into close contact with fixture locating surface during specimen clamping to be processed.
3. a kind of method for prefabricating of metal material cycles left life-span specimen surface crackle according to claim 1, it is special
Sign is, in step 2), using electric spark shaping mill carry out marking, using small-power power, single marking finite depth, repeatedly
The mode of processing obtains required depth dimensions.
4. a kind of method for prefabricating of metal material cycles left life-span specimen surface crackle according to claim 3, it is special
Sign is, in step 2), is specifically added using the combination of different edm forming marking technological parameters in specimen surface
Work, including Q modulating frequencies, electric spark power, processing times, path filling mode, record each group of machined parameters.
5. a kind of method for prefabricating of metal material cycles left life-span specimen surface crackle according to claim 3, it is special
Sign is, by test specimen of the progress face crack source in step 2) after prefabricated by universal tool-measuring microscope to edm forming marking
Appearance and size is detected, and has been detected part after appearance and size along the centre position wire cutting perpendicular to scribe length direction
Cut-out, the sample after cut-out is inlayed into sample, measures groove depth and remelted layer thickness after corrosion on ESEM.
6. a kind of method for prefabricating of metal material cycles left life-span specimen surface crackle according to claim 1, it is special
Sign is, determines suitable edm forming marking technological parameter by testing result, and use suitable edm forming mark
Carving technology parameter processing sample face crack source is prefabricated.
7. a kind of method for prefabricating of metal material cycles left life-span specimen surface crackle according to claim 1, it is special
Sign is, in step 3), treats processing sample and applies different alternative cycle load progress fatigue crack prefabrications, while uninterruptedly
Fatigue crack tip spread scenarios, and monitoring at any time and measurement crack length are observed, it is determined that the experiment of suitable prefabricating fatigue crack
Load.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710900029.9A CN107807025A (en) | 2017-09-28 | 2017-09-28 | A kind of method for prefabricating of metal material cycles left life-span specimen surface crackle |
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| CN201710900029.9A CN107807025A (en) | 2017-09-28 | 2017-09-28 | A kind of method for prefabricating of metal material cycles left life-span specimen surface crackle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112629972A (en) * | 2020-12-18 | 2021-04-09 | 上海灏行化工科技有限公司 | Method for prefabricating defects of inner wall of pipeline and force application device |
| CN113514291A (en) * | 2020-04-09 | 2021-10-19 | 中国航发商用航空发动机有限责任公司 | Method for preparing test sample with surface cracks |
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| US6993948B2 (en) * | 2003-06-13 | 2006-02-07 | General Electric Company | Methods for altering residual stresses using mechanically induced liquid cavitation |
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| CN104713762A (en) * | 2015-03-17 | 2015-06-17 | 西安交通大学 | Preparation method of simulation stress corrosion cracks for eddy current testing |
| CN105939807A (en) * | 2013-12-19 | 2016-09-14 | 三菱电机株式会社 | Wire discharge machining equipment, wire discharge machining method and control device |
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2017
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Patent Citations (4)
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| US6993948B2 (en) * | 2003-06-13 | 2006-02-07 | General Electric Company | Methods for altering residual stresses using mechanically induced liquid cavitation |
| CN105939807A (en) * | 2013-12-19 | 2016-09-14 | 三菱电机株式会社 | Wire discharge machining equipment, wire discharge machining method and control device |
| CN104034600A (en) * | 2014-05-20 | 2014-09-10 | 北京航空航天大学 | Fatigue crack propagation experiment testing system under extremely high temperature environment |
| CN104713762A (en) * | 2015-03-17 | 2015-06-17 | 西安交通大学 | Preparation method of simulation stress corrosion cracks for eddy current testing |
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| 吴家梅等: "FGH95粉末盘剩余循环寿命的裂纹源制作及测定", 《材料工程》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113514291A (en) * | 2020-04-09 | 2021-10-19 | 中国航发商用航空发动机有限责任公司 | Method for preparing test sample with surface cracks |
| CN112629972A (en) * | 2020-12-18 | 2021-04-09 | 上海灏行化工科技有限公司 | Method for prefabricating defects of inner wall of pipeline and force application device |
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Application publication date: 20180316 |
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