CN109142427A - A method of characterization material ductile-brittle transiton critical point - Google Patents
A method of characterization material ductile-brittle transiton critical point Download PDFInfo
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- CN109142427A CN109142427A CN201811158689.5A CN201811158689A CN109142427A CN 109142427 A CN109142427 A CN 109142427A CN 201811158689 A CN201811158689 A CN 201811158689A CN 109142427 A CN109142427 A CN 109142427A
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- G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
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Abstract
A method of characterization material impact toughness ductile-brittle transiton critical point, comprising the following steps: first, impact property test is carried out to sample at different temperatures, obtains impact energy value；Second, measure non-shear area's diameter contracting minimum dimension；Third calculates non-shear area's diameter contracting ratioβ；4th, utilize origin or excel Software on DrawingβRelational graph between temperature calculates critically weighted according to Boltzmann formula；5th, and the critically weighted that average function transformation approach determines compares；With cost is not increased, method is simple, feature applied widely.
Description
Technical field
The invention belongs to material fracture property characterization technique fields, and in particular to a kind of characterization material ductile-brittle transiton critical point
Method.
Background technique
It is found when studying casing drilling steel and jumper steel impact property, ductile-brittle transiton critical point is that one of material is important
Characteristic parameter, be more than this point, material is capable of the application of safety, is lower than the great decline of this Impact Properties of Materials, significant to increase
Add fracture probability.
Currently, there are many method of characterization material impact toughness critical point, such as plastic fracture transition, is put down fracture apperance transformation
Equal function transformation, ductility transition etc..In contrast, average function changes more with fracture apperance transformation, and fracture apperance
Transition temperature and average function transition temperature are relatively.
But average function transformation must be completed by testing, it is necessary to which processing criterion sample etc., fracture apperance transformation then exist
Further problems, especially material are not necessarily complete fiber fracture when being in upper mounting plate.
Summary of the invention
To overcome above-mentioned the deficiencies in the prior art, the purpose of the present invention is to provide a kind of characterization material ductile-brittle transiton is critical
The method of point, overcomes the limitation of the existing impact flexibility ductile-brittle transiton critical point characterizing method of material, it may be convenient to carry out material
The ductile-brittle transiton point of material determines that the present invention, which has, does not increase cost, and method is simple, feature applied widely.
To achieve the goals above, the technical solution adopted by the present invention is that: a kind of material impact toughness ductile-brittle transiton is critical
The new method of point characterization, comprises the following steps that
First, impact property test is carried out to sample at a temperature of different tests, obtains the impact energy value of sample；
Second, measure non-shear area's diameter reduced scale cun of sampleW min；
Third calculates non-shear area's diameter contracting ratio that second step obtains using following formula
β=W min/W
In formula:βFor non-shear area's diameter contracting ratio of impact specimen fracture；WFor the original width of sample, unit mm；W minFor sample
The minimum widith of the non-shear area's diameter contracting of fracture, mm after impact test；
4th, utilize origin or excel Software on DrawingβRelational graph between temperature is faced according to the calculating of Boltzmann formula
Boundary's temperature spot；
5th, the critically weighted that the 4th step obtains and the critically weighted that average function transformation approach determines are compared.
The test temperature must include ductile-brittle transition temperature；The test temperature are as follows: -60 DEG C~80 DEG C.
The non-shear area's diameter reduced scale cun of measurement described in step 3 is not limited to pars fibrosa, including cleavage area, and cleavage area is to remove to cut
Cut the region other than area.
Compared with prior art, the beneficial effects of the present invention are:
Present invention is mainly applied to determine the ductile-brittle transiton critical point of material, in terms of can be widely applied for security evaluation.This hair
It is bright, it is characterized using non-shear area's necking down rate.When non-shear area's necking down rate is less than a certain value, material can then be used safely,
If not necking down rate in shear zone is greater than a certain value, then cannot use safely.Because it is fixed that non-shear area's necking down rate and impact energy value have
Therefore magnitude relation can substitute average function with non-shear area's necking down rate and change method, the fiber crops tested must be done by avoiding average works
It is tired, security evaluation especially is carried out at operating condition scene, it is very convenient.Because non-shear area's necking down rate itself is disconnected by observing and measuring
The information that mouth obtains, therefore also alternative fracture apperance changes method, can also substitute ductility transition method, it is more quasi- than topographical transition method
Really, more extensive than ductility transition method application.
It uses method of the invention, it is possible to provide a kind of new table for the determination of material impact toughness ductile-brittle transiton critical point
Sign method, the ductile-brittle transiton point that can very easily carry out material determine.The present invention, which has, does not increase cost, and method is simple, fits
The features such as wide with range.To increase the convenience and accuracy of Impact Properties of Materials ductile-brittle transiton, while also increasing mistake
The convenience and diversity for imitating analysis, have great importance in terms of the tough crisp characterization of Impact Properties of Materials.
Present invention determine that a characteristic parameter " non-shear area's diameter contracting ratio ", can determine that material impact can be worth according to the parameter；
It can be obtained the toughness ductile-brittle transiton critical point of material according to the impact fracture of material.
Detailed description of the invention
Fig. 1 is the minimum widith instrumentation plan of the non-shear area's diameter contracting of fracture after impact test of the present invention.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and examples.
Embodiment one
First, impact property test is carried out to sample at different temperatures, to obtain impact energy value.
Material is Steel for Petroleum Drill Pipes, and main component is as shown in the table:
| Element | C% | Si% | Mn% | P% | S% | Cr% | Mo% | Ni% | Fe% |
| Mass fraction | 0.281 | 0.4 | 0.452 | < 0.005 | 0.0024 | 1.347 | 0.689 | 0.657 | >95 |
It is limited to scantling, all samples are 3/4 sample, i.e. 7.5X10X55.Test carries out under different temperatures environment,
Including 80 DEG C, 60 DEG C, 40 DEG C, 20 DEG C, 0 DEG C, -20 DEG C, -40 DEG C, -60 DEG C.Impact property test is carried out to above 6 groups of samples,
To obtain impact energy value；
| Temperature/DEG C | 80 | 60 | 40 | 20 | 0 | -20 | -40 | -60 |
| Impact energy value/J | 110.1 | 110.3 | 107.5 | 96.75 | 68.00 | 56.60 | 44.20 | 37.70 |
Second, measure non-shear area's diameter reduced scale cunW min；
| Temperature/DEG C | 80 | 60 | 40 | 20 | 0 | -20 | -40 | -60 |
| Non-shear area's diameter contracting/mm | 2.50 | 2.63 | 2.54 | 3.08 | 4.16 | 4.35 | 5.01 | 5.16 |
Dotted line is the cut-off rule of pars fibrosa and shear zone in figure, and double arrowed line is non-shear area's diameter contracting minimum widith；
Third calculates non-shear area's diameter contracting ratio using following formula
β=W min/W
In formula:βFor non-shear area's diameter contracting ratio of impact specimen fracture；WFor the original width of sample, unit mm；W minFor sample
The minimum widith of the non-shear area's diameter contracting of fracture, unit mm after impact test；
| Temperature/DEG C | 80 | 60 | 40 | 20 | 0 | -20 | -40 | -60 |
| Non-shear area's diameter contracting Wmin/mm | 2.50 | 2.63 | 2.54 | 3.08 | 4.16 | 4.35 | 5.01 | 5.16 |
| Non-shear area's diameter contracting ratioβ | 0.333 | 0.351 | 0.339 | 0.411 | 0.555 | 0.584 | 0.668 | 0.688 |
It determines a characteristic parameter " non-shear area's diameter contracting ratio ", can determine that material impact can be worth according to the parameter；
The non-shear area's diameter reduced scale cun of measurement described in step 3 is not limited to pars fibrosa, including cleavage area, and cleavage area is to remove shear zone
Region in addition；The shear zone of dotted line two sides in region, that is, Fig. 1 other than the shear zone of two sides.
4th, utilize origin Software on DrawingβRelational graph between temperature is fitted with reference to Boltzmann formula,
2.68 DEG C of critically weighted are calculated, coefficient R 0.9822.
5th, by critically weighted that the 4th step obtains and average function transformation approach determines 2.29 DEG C of critically weighted carry out pair
Than finding error within the scope of ± 0.5 DEG C.
Embodiment two
First, impact property test is carried out to sample at different temperatures, obtains impact energy value；
Material is Steel for Petroleum Drill Pipes, and main component is as shown in the table:
| Element | C% | Si% | Mn% | P% | S% | Cr% | Mo% | Fe% |
| Mass fraction | 0.234 | 0.293 | 0.831 | 0.0052 | 0.0021 | 1.111 | 1.665 | >95 |
It is limited to scantling, all samples are 3/4 sample, i.e. 7.5X10X55, and test carries out under different temperatures environment,
Including 40 DEG C, 20 DEG C, -20 DEG C, -60 DEG C, impact property test is carried out to the above sample, to obtain impact energy value；
| Temperature/DEG C | 40 | 20 | -20 | -60 |
| Impact energy value/J | 96.8 | 100.2 | 68.1 | 37.9 |
Second, measure non-shear area's diameter reduced scale cunW min；
| Temperature/DEG C | 40 | 20 | -20 | -60 |
| Non-shear area's diameter contracting/mm | 2.66 | 2.64 | 4.01 | 5.4 |
Dotted line is the cut-off rule of pars fibrosa and shear zone in figure, and double arrowed line is non-shear area's diameter contracting minimum widith；
Third calculates non-shear area's diameter contracting ratio using following formula
β=W min/W
In formula:βFor non-shear area's diameter contracting ratio of impact specimen fracture；WFor the original width of sample, mm；W minIt impacts and tries for sample
Test the minimum widith of the non-shear area's diameter contracting of rear fracture, mm；
| Temperature/DEG C | 40 | 20 | -20 | -60 |
| Non-shear area's diameter contractingW min/mm | 2.66 | 2.64 | 3.49 | 5.4 |
| Non-shear area's diameter contracting ratioβ | 0.355 | 0.352 | 0.534 | 0.720 |
It determines a characteristic parameter " non-shear area's diameter contracting ratio ", can determine that material impact can be worth according to the parameter；
The non-shear area's diameter reduced scale cun of measurement described in step 3 is not limited to pars fibrosa, including cleavage area, and cleavage area is to remove shear zone
Region in addition；The shear zone of dotted line two sides in region, that is, Fig. 1 other than the shear zone of two sides.
4th, utilize Software on DrawingβRelational graph between temperature is fitted with reference to Boltzmann formula, is calculated
Critically weighted is -20.29 DEG C；
5th, by critically weighted that the 4th step obtains and average function transformation approach determines 18.82 DEG C of critically weighted carry out pair
Than finding error within the scope of ± 3 DEG C.
Embodiment three
First, impact property test is carried out to sample at different temperatures, to obtain impact energy value；
Material is steel, and main component is as shown in the table:
| Element | C% | Si% | Mn% | P% | S% | Cr% | Mo% | Fe% |
| Mass fraction | 0.24 | 0.08 | 0.72 | 0.005 | 0.002 | 2.09 | 0.82 | >95 |
Sample is full sample, i.e. 10X10X55, using v-notch.Test carries out under different temperatures environment, including 80 DEG C,
40 DEG C, 10 DEG C, 0 DEG C, -20 DEG C, -40 DEG C, -60 DEG C, impact property test is carried out to above 7 groups of samples, to obtain impact energy
Value；
| Temperature/DEG C | 80 | 40 | 10 | 0 | -20 | -40 | -60 |
| Impact energy value/J | 69.90 | 34.63 | 18.39 | 8.30 | 6.82 | 6.50 | 6.22 |
Second, measure non-shear area's diameter reduced scale cunW min；
| 80 temperature/DEG C | 80 | 40 | 10 | 0 | -20 | -40 | -60 |
| Non-shear area's diameter contracting/mm | 5.35 | 6.75 | 7.72 | 8.79 | 9.12 | 9.26 | 9.41 |
Dotted line is the cut-off rule of pars fibrosa and shear zone in figure, and double arrowed line is non-shear area's diameter contracting minimum widith；
Third calculates non-shear area's diameter contracting ratio using following formula,
β=W min/W
In formula:βFor non-shear area's diameter contracting ratio of impact specimen fracture；WFor the original width of sample, unit mm；W minFor sample
The minimum widith of the non-shear area's diameter contracting of fracture, unit mm after impact test；
| Temperature/DEG C | 80 | 40 | 10 | 0 | -20 | -40 | -60 |
| Non-shear area's diameter contractingW min/mm | 5.35 | 7.4 | 8.55 | 8.99 | 9.12 | 9.26 | 9.41 |
| Non-shear area's diameter contracting ratioβ | 0.535 | 0.74 | 0.855 | 0.899 | 0.912 | 0.926 | 0.941 |
It determines a characteristic parameter " non-shear area's diameter contracting ratio ", can determine that material impact can be worth according to the parameter；
The non-shear area's diameter reduced scale cun of measurement described in step 3 is not limited to pars fibrosa, including cleavage area, and cleavage area is to remove shear zone
Region in addition；The shear zone of dotted line two sides in region, that is, Fig. 1 other than the shear zone of two sides.
4th, utilize origin Software on DrawingβRelational graph between temperature is fitted with reference to Boltzmann formula
50.53 DEG C of critically weighted are calculated, coefficient R 0.998；
5th, by critically weighted that the 4th step obtains and average function transformation approach determines 51.12 DEG C of critically weighted carry out pair
Than finding error within the scope of ± 3 DEG C.
Claims (3)
1. a kind of method for characterizing the ductile-brittle transiton critical point of material impact toughness, which is characterized in that comprise the following steps that
First, impact property test is carried out to sample under different test temperatures, obtains impact energy value；
Second, measure non-shear area's diameter reduced scale cunW min；
Third calculates non-shear area's diameter contracting ratio using following formula
β=W min/W
In formula:βFor non-shear area's diameter contracting ratio of impact specimen fracture；WFor the original width of sample, unit mm；W minFor sample
The minimum widith of the non-shear area's diameter contracting of fracture, unit mm after impact test；
4th, utilize origin or excel Software on DrawingβRelational graph between temperature is faced according to the calculating of Boltzmann formula
Boundary's temperature spot calculates critically weighted；
5th, the critically weighted that the 4th step obtains and the critically weighted that average function transformation approach determines are compared.
2. a kind of method for characterizing the ductile-brittle transiton critical point of material impact toughness according to claim 1, which is characterized in that
The test temperature must include ductile-brittle transition temperature；The test temperature are as follows: -60 DEG C~80 DEG C.
3. a kind of method for characterizing material impact toughness according to claim 1, which is characterized in that survey described in step 3
It measures non-shear area's diameter reduced scale cun and is not limited to pars fibrosa, including cleavage area.
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Citations (7)
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|---|---|---|---|---|
| JP2003315226A (en) * | 2002-04-19 | 2003-11-06 | Nippon Steel Corp | Evaluation method for toughness in welding-heat influence part of steel material |
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-
2018
- 2018-09-30 CN CN201811158689.5A patent/CN109142427A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003315226A (en) * | 2002-04-19 | 2003-11-06 | Nippon Steel Corp | Evaluation method for toughness in welding-heat influence part of steel material |
| 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 |
| CN102042929A (en) * | 2009-10-13 | 2011-05-04 | 中国石油天然气集团公司 | Pipeline steel Charpy specimen fracture separation degree grading method |
| CN103063508A (en) * | 2012-12-26 | 2013-04-24 | 华东理工大学 | Nondestructive testing method for metal material fracture toughness |
| CN104075935A (en) * | 2014-06-27 | 2014-10-01 | 中南钻石有限公司 | Method for correcting test value of impact toughness of artificial diamond |
| CN106501100A (en) * | 2016-09-13 | 2017-03-15 | 中国电力科学研究院 | Electric power pylon tower material toughness appraisal procedure and device |
| CN106556643A (en) * | 2016-09-28 | 2017-04-05 | 昆明理工大学 | A kind of metal material Cold Brittleness Transition Temperature assay method |
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Application publication date: 20190104 |