CN107703007A - A kind of hard alloy impact toughness at room temperature detection method - Google Patents
A kind of hard alloy impact toughness at room temperature detection method Download PDFInfo
- Publication number
- CN107703007A CN107703007A CN201710723841.9A CN201710723841A CN107703007A CN 107703007 A CN107703007 A CN 107703007A CN 201710723841 A CN201710723841 A CN 201710723841A CN 107703007 A CN107703007 A CN 107703007A
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- CN
- China
- Prior art keywords
- sample
- hard alloy
- impact
- precrack
- room temperature
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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
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0039—Hammer or pendulum
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
Abstract
The invention discloses a kind of detection method of hard alloy impact flexibility, mainly include：Using the sample of precrack, pendulum impact test is carried out, according to pendulum energy loss calculation impact flexibility.The present invention effect be：（1）Using the impact flexibility that this method measures than conventional impact flexibility method（Sample does not have precrack）The impact flexibility of material can be more represented, while it is more preferable to detect data stability；（2）This method is easy to operate, quick.
Description
Technical field
The invention belongs to Cemented Carbide Properties detection field, and in particular to a kind of hard alloy impact toughness at room temperature detection side
Method.
Background technology
Hard alloy belongs to fragile material, and impact flexibility is to evaluate the important indicator of its fracture mechanical property.
Existing hard alloy normal temperature impact test method（GB/T1817-1995 GB/T 1817-1995）It is pendulum punching
Striking.Specimen size is 5x5x50mm, span 30mm.By calculating the energy difference before and after Charpy impact sample, so as to be tried
The impact flexibility ak of sample.
Following defect be present in this method：
（1）Due to being tested using non-notch, on the one hand, when doing pendulum impact test, only some disappears in absorption energy
Consume on the section for disconnecting sample break, remainder is then consumed before sample is thrust, the plastic deformation near breach in volume
On.Therefore, impact toughness ak is unable to the toughness of authentic representative material.
（2）On the other hand, various random defects are inevitably present in Hardmetal materials, cause impact flexibility result
Data decentralization is larger.
Based on the above state of the art, technical staff is directed to researching and developing a kind of relative authentic representative Impact Toughness of Alloy of energy, and
Relatively stable detection method.
The content of the invention
The defects of for prior art, it is an object of the invention to provide a kind of hard alloy impact toughness at room temperature detection side
Method, the impact flexibility of the numerical value energy authentic representative hard alloy measured using this method, while it is more stable to detect data.
Realize that the purpose of the present invention is adopted the technical scheme that：A kind of hard alloy impact toughness at room temperature detection method,
It is characterized in that method and step is as follows：
（1）Using square bar sample, after grinding, size reaches 5x5mmx50mm；
（2）Using laser-etching process, in hard alloy side, bar sample treats prefabricated vertical rifts in the middle part of shock surface first；
（3）Using pendulum test machine, pendulum impact test is carried out to the square bar sample of precrack, precrack face is backwards to pendulum
Hammering blow, the energy loss after Charpy impact is read, calculate notched bar impact strength.
Further, the sample using precrack, pendulum impact test is carried out, according to pendulum energy loss calculation
Impact flexibility；Using the impact flexibility that this method measures than conventional impact flexibility method（Sample does not have precrack）It can more represent
The impact flexibility of material, while testing result data stability is more preferable.
Further, described prefabricated using laser-etching process progress crackle, this method is easy to operate, quick；It can also adopt
With other crackle method for prefabricating, include but is not limited to：Indentation method, wire cutting method etc..
It is an advantage of the invention that：After handling sample according to the method described above, due to the previously prepared micro-crack of sample, impact examination
The section that the energy attenuation tested is completely used for sample absorbs energy, therefore the notched bar impact strength energy authentic representative sample measured rushes
Hit toughness.Simultaneously as being much larger than size the defects of inside sample on prefabricated micro-crack yardstick, sample internal flaw is to sample
Fracture will not serve obvious, therefore result of the test stability is improved.
Brief description of the drawings
Fig. 1 pendulum method impact test schematic diagrames.
Fig. 2 laser pre-flawed specimen schematic diagrames.
Embodiment
Embodiments of the invention are described in further detail below in conjunction with brief description of the drawings, but the present embodiment is not used to limit
The system present invention, every similar structure using the present invention and its similar change, all should be included in protection scope of the present invention.
A kind of hard alloy impact toughness at room temperature detection method, it is characterised in that：
（1）Hard alloy side's bar sample first passes through plain grinding, and size reaches 5（±0.03）x5（±0.03）x50（±1.0）mm；
（2）Using laser-etching process, treat to etch the deep indentations of a treaty 0.3mm in the middle part of shock surface in sample, due to laser
The quick effect heated and quickly cooled down, sharp micro-crack, the depth and size of the micro-crack and examination are produced in indentation bottom
The material toughness of sample is directly related, and its micro-crack of the better material of toughness is smaller, its micro-crack of the poorer material of toughness it is more long more
Sharply；
（3）Impact test is carried out from suitable pendulum, precrack face is backwards to Charpy impact；
（4）The energy loss after Charpy impact is read, calculates impact flexibility.
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to the technology of this area
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill to this area
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the present invention
Protection domain.
Case study on implementation 1：Two groups of material compositions formula of experiment is as follows：
The performance test results of two groups of materials of experiment are as follows：
Find out from upper table data, the impact flexibility of this method detection（Precrack）Result stability have more apparent improvement；Together
When see that the notched bar impact strength of A materials is better than than material, this and conventional impact flexibility（Without precrack）The result that method measures
On the contrary, this conclusion is verified in actual use.
The specific implementation case of the present invention is described above.It is to be appreciated that the invention is not limited in upper
Particular implementation is stated, those skilled in the art can make various deformations or amendments within the scope of the claims, and this is not
Influence the substantive content of the present invention.
Claims (3)
1. a kind of hard alloy impact toughness at room temperature detection method, it is characterised in that method and step is as follows：
（1）Using sample side's bar sample of precrack, after grinding, size reaches 5x5mmx50mm；
（2）Using laser-etching process, in hard alloy side, bar sample treats prefabricated vertical rifts in the middle part of shock surface first；
（3）Using pendulum test machine, pendulum impact test is carried out to the square bar sample of precrack, precrack face is backwards to pendulum
Hammering blow, the energy loss after Charpy impact is read, calculate notched bar impact strength.
A kind of 2. hard alloy impact toughness at room temperature detection method according to claim 1, it is characterised in that：Sample is side
Bar sample, size are not limited to 5x5x50mm, can suitably be changed.
A kind of 3. hard alloy impact toughness at room temperature detection method according to claim, it is characterised in that：Can be in hard
Alloy sample surface produces precrack, including but not limited to laser-etching process, or is wire cutting method or is indentation method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710723841.9A CN107703007A (en) | 2017-08-22 | 2017-08-22 | A kind of hard alloy impact toughness at room temperature detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710723841.9A CN107703007A (en) | 2017-08-22 | 2017-08-22 | A kind of hard alloy impact toughness at room temperature detection method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107703007A true CN107703007A (en) | 2018-02-16 |
Family
ID=61170229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710723841.9A Pending CN107703007A (en) | 2017-08-22 | 2017-08-22 | A kind of hard alloy impact toughness at room temperature detection method |
Country Status (1)
| Country | Link |
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| CN (1) | CN107703007A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101923026A (en) * | 2009-06-10 | 2010-12-22 | 沈阳黎明航空发动机(集团)有限责任公司 | Test method for T-type fissure impact toughness |
-
2017
- 2017-08-22 CN CN201710723841.9A patent/CN107703007A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101923026A (en) * | 2009-06-10 | 2010-12-22 | 沈阳黎明航空发动机(集团)有限责任公司 | Test method for T-type fissure impact toughness |
Non-Patent Citations (4)
| Title |
|---|
| 丁怀清 等: "《先进制造技术》", 31 January 2014, 中央广播电视大学出版社 * |
| 国家技术监督局: "《GB/T 1817-1995硬质合金常温冲击韧性试验方法》", 1 December 1995 * |
| 国家标准局: "《GB 4742-1984日用陶瓷冲击韧性测定方法》", 1 August 1985 * |
| 李维娟 等: "《材料科学与工程实验指导书》", 31 March 2016, 冶金工业出版社 * |
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| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180216 |