CN109799156A - A kind of performance creep and the interactive research method of carburizing - Google Patents
A kind of performance creep and the interactive research method of carburizing Download PDFInfo
- Publication number
- CN109799156A CN109799156A CN201711141230.XA CN201711141230A CN109799156A CN 109799156 A CN109799156 A CN 109799156A CN 201711141230 A CN201711141230 A CN 201711141230A CN 109799156 A CN109799156 A CN 109799156A
- Authority
- CN
- China
- Prior art keywords
- creep
- carburizing
- sample
- test
- hardness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a kind of performance creeps and the interactive research method of carburizing, comprising the following steps: A, samples from ethylene cracking tube, carries out creep test different degrees of under 950 DEG C and 35MPa；B, it is then sampled from the sample and original furnace tube material after different degrees of creep, carries out the Carburization Treatment of different time；C, the test of Vickers hardness is carried out to the sample through different disposal process, and draws hardness profile.By Variable Control method, so that firmness change reflects the power of carburizing to the full extent, to obtain influence of the different level of creep to carburizing.Test method of the present invention is simple, and obtained result representativeness is good.
Description
Technical field
The present invention relates to metal hardness experimental technique field, specially a kind of performance creep and the interactive research of carburizing
Method.
Background technique
Ethane cracking furnace is the parallel off for being widely used in the macromolecular substances such as petrochemical industry, electric power, metallurgy, combustion gas, and ethylene is split
Solve boiler tube, be one of component of its core, once occur rupture or the damaged cycle of operation that will seriously affect package unit and
Using safe.However, the practical military service service life of ethylene cracking tube of investment even only designs in China market at present
The one third in service life, creep and carburizing and its reciprocation become one of the most important reason of boiler tube failure.
Hardness is to measure an important performance indicator of the soft or hard degree of metal material, it is elastic properties of materials, plasticity, intensity
With the overall target of the mechanical properties such as toughness, material Carburization Treatment rear surface hardness has certain promotion, but works as creep and carburizing
When existing simultaneously, the influence factor of hardness also adds the work such as processing hardening and organization softening in creep process in addition to carburizing
With, thus the effect of carburizing cannot be judged by the variation of hardness merely.
The purpose of the present invention is to provide a kind of performance creeps and the interactive research method of carburizing, pass through Variable Control
Method indicates that carburizing degree is strong and weak using hardness, to solve the problems mentioned in the above background technology.
Summary of the invention
To achieve the above object, the invention provides the following technical scheme: a kind of performance creep with carburizing is interactive grinds
Study carefully method, comprising the following steps:
A, it is sampled on the original ethylene cracking tube being never on active service, carries out creep examination different degrees of under 950 DEG C and 35MPa
It tests；
B, it is then sampled from the sample and original furnace tube material after different degrees of creep, at the carburizing for carrying out different time
Reason；
C, the test of Vickers hardness is carried out to the sample through different disposal process, and draws hardness profile.
Preferably, creep test step in the step A are as follows:
A, take creep sample, the design and processing of creep sample referring especially to GB/T2039-1997 " metal stretching creep and
Duration running method ", specimen finish is 5mm, gauge length 27mm in gauge length；
B, creep sample obtained by step a is surveyed on GWT304 high temperature creep endurance testing machine, the testing machine dynamometry
Range is 6-30KN, the use of temperature is 300-1200 DEG C；950 DEG C of test temperature the selection of material service temperature, stress is selected as
35MPa, soaking time 0.2h, measure creep rupture life be 381 hours, i.e., level of creep 100% when creep time be 381
Hour, thus test period when level of creep is respectively 30%, 50%, 80% is respectively selected as 118,188,291 hours.
Preferably, method for carburizing in the step B are as follows: the temperature of Carburization Treatment is 1100 DEG C, strong to seep stage and carbon spread
Stage, alternately final oil was cold, and carburizing duration is respectively selected as 5,10 and 30 hours.
Preferably, in the step C Vickers hardness testing procedure are as follows:
A, mixcrohardness test analyzes specimen cross section using FM-800 micro Vickers, wherein sample takes
Furnace tube material from after original boiler tube tissue, carburizing and creep uses 10gCuSO4+ after edge sample, corase grinding, fine grinding, polishing
The corrosive liquid of 50mlHCl+50mlH2O is corroded；
B, hardness test is then carried out, load lotus is 300g, load time 10s, and same radial position is repeatedly surveyed
Amount is to reduce the influence of data dispersibility.
Compared with prior art, the beneficial effects of the present invention are: the present invention tests process: being taken from ethylene cracking tube
Sample, carry out different degrees of creep test under 950 DEG C and 35MPa (first carry out the creep test broken under 950 DEG C and 35MPa,
Measuring creep life is 381 hours, thus the creep test time of 30%, 50%, 80% level of creep is taken to be respectively as follows: 118,
188 and 291 hours), then sampled from the sample and original furnace tube material after different degrees of creep, progress different time (5,
10,30 hours) Carburization Treatment, to through different disposal process sample carry out Vickers hardness test, and draw hardness distribution
Curve can control variable by the comparison of all kinds of blank samples using this test method, to exclude to organize in creep process
Softening and the effect of processing hardening so that firmness change reflects the power of material carburizing to the full extent, and then are studied different
Influence of the level of creep to carburizing, obtained result representativeness are good.
Detailed description of the invention
Fig. 1 is the hardness profile of non-carburizing sample after the different degrees of creep of the present invention；
Fig. 2 is the hardness profile of the different degrees of creep sample carburizing 5 hours of the present invention；
Fig. 3 is the hardness profile of the different degrees of creep sample carburizing 10 hours of the present invention；
Fig. 4 is the hardness profile of the different degrees of creep sample carburizing 30 hours of the present invention；
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
Fig. 1-4 is please referred to, the invention provides the following technical scheme: a kind of performance creep and the interactive research side of carburizing
Method, comprising the following steps:
A, it is sampled from ethylene cracking tube, carries out creep test different degrees of under 950 DEG C and 35MPa；
B, it is then sampled from the sample and original furnace tube material after different degrees of creep, at the carburizing for carrying out different time
Reason；
C, the test of Vickers hardness is carried out to the sample through different disposal process, and draws hardness profile.
In the present invention, creep test step in step A are as follows:
A, take creep sample, the design and processing of creep sample referring especially to GB/T2039-1997 " metal stretching creep and
Duration running method ", specimen finish is 5mm, gauge length 27mm in gauge length；
B, it is surveyed on GWT304 high temperature creep endurance testing machine later, which is 6-30KN, is made
It is 300-1200 DEG C with temperature；950 DEG C of test temperature the selection of material service temperature, stress is selected as 35MPa, and soaking time is
0.2h, the time is respectively 118,188,291 and 381 hours, and is broken at 381 hours, level of creep is respectively 0,30%,
50%, 80%, 100%.
In the present invention, method for carburizing in step B are as follows: the temperature of Carburization Treatment is 1100 DEG C, strong to seep stage and carbon spread rank
Alternately, final oil is cold, and carburizing duration is respectively selected as 5,10 and 30 hours for section.
In the present invention, the testing procedure of Vickers hardness in step C are as follows:
A, mixcrohardness test analyzes specimen cross section using FM-800 micro Vickers, wherein sample takes
Furnace tube material from after original boiler tube, carburizing and creep uses 10gCuSO4+ after edge sample, corase grinding, fine grinding, polishing
The corrosive liquid of 50mlHCl+50mlH2O is corroded；
B, hardness test is then carried out, load lotus is 300g, load time 10s, and same radial position is repeatedly surveyed
Amount is to reduce the influence of data dispersibility.
As seen from Figure 1, for through different degrees of creep and for the sample of non-carburizing, a little higher than inside of borderline hardness
Hardness is not much different.In comparison, the creep sample hardness highest of non-carburizing, with the growth of creep time, creep journey
Degree increases, integral hardness decline, until integral hardness is minimum when 100% level of creep (breaking sample).This shows in creep
In the process, increase at any time, the degree of organization softening is greater than the effect of tension stiffening, so that sample integral hardness is with creep
Degree increases and declines.Fig. 1 eliminates the effect of organization softening and processing hardening, so that the influence factor of hardness is predominantly seeped
Carbon, so that the hardness distribution of sample can indicate the power of carburizing.
It can be seen from Fig. 2-4 different level of creep sample carburizings after a certain period of time, surface hardness, which has, significantly to be mentioned
Height, and centre hardness and the sample difference of non-carburizing are little.
As seen from Figure 4, in the sample of different level of creep after carburizing in 30 hours, center portion difference in hardness not
Greatly, and in the part being obviously improved close to surface hardness it is observed that antipodal rule is presented with Fig. 1: be equally through
It is maximum to have gone through 30 hours Carburization Treatments, the specimen surface hardness highest of non-creep, and carburizing depth, and with level of creep
Increase, hardness is gradually reduced, and carburizing 30 hours sample hardness obtained is minimum after 100% level of creep, corresponding carburizing
Depth is also just minimum.Fig. 3 and Fig. 4 has similarity rules, and carburizing 10 hours sample integral hardness and carburizing depth are less than carburizing
30 hours samples, meet cognitive law.
In Fig. 2, different 5 hours rear surface hardness of level of creep sample carburizing are not much different.Analysis chart 1 and Fig. 3-4 are different
When the non-carburizing of level of creep sample, hardness is original furnace tube material, 30% level of creep sample, 50% creep journey from high to low
Spend sample, 80% level of creep sample, 100% level of creep sample, and the sample carburizing of different level of creep 10 hours and 30
Hour after hardness it is equal from high to low are as follows: 100% level of creep sample, 80% level of creep sample, 50% level of creep sample,
30% level of creep sample, non-creep sample.This variable of carburizing time is only changed in Fig. 1 and Fig. 3-4, thus is shown
The higher sample of level of creep is easier by carburizing.And the hardness curve in Fig. 2 after carburizing 5 hours then shows bringing for carburizing
Influence also not over organization softening after creep and tension stiffening bring combined influence.
It can be seen from Fig. 1-4 under identical car-burization condition (being greater than 10 hours), the higher sample of level of creep, surface layer
Hardness is higher, i.e. the easier progress of carburizing, i.e. creep plays facilitation to carburizing.
The present invention tests process: sampling from ethylene cracking tube, carries out creep different degrees of under 950 DEG C and 35MPa
Test (creep test broken under 950 DEG C and 35MPa is first carried out, measuring creep life is 381 hours, thus take 30%,
50%, the creep test time of 80% level of creep is respectively as follows: 118,188 and 291 hours), then after different degrees of creep
Sample and original furnace tube material on sample, carry out different time (5,10,30 hours) Carburization Treatment, to through different disposal
The sample of process carries out test and the microstructure observation of Vickers hardness, and draws hardness profile, using this test method
Simply, the result representativeness obtained is good.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (4)
1. a kind of performance creep and the interactive research method of carburizing, comprising the following steps:
A, it is sampled on the original ethylene cracking tube being never on active service, carries out creep test different degrees of under 950 DEG C and 35MPa；
B, it is then sampled from the sample and original furnace tube material after different degrees of creep, carries out the Carburization Treatment of different time；
C, the test of Vickers hardness is carried out to the sample through different disposal process, and draws hardness profile.
2. a kind of performance creep according to claim 1 and the interactive research method of carburizing, it is characterised in that: described
Creep test step in step A are as follows:
A, creep sample is taken, the design and processing of creep sample are referring especially to GB/T2039-1997 " metal stretching creep and persistently
Test method ", specimen finish is 5mm, gauge length 27mm in gauge length；
B, creep sample obtained by step a is surveyed on GWT304 high temperature creep endurance testing machine, the testing machine dynamometry range
It the use of temperature is 300-1200 DEG C for 6-30KN；950 DEG C of test temperature the selection of material service temperature, stress is selected as 35MPa,
Soaking time is 0.2h, measure creep rupture life be 381 hours, i.e., level of creep 100% when creep time be 381 hours, because
And test period of level of creep when being respectively 30%, 50%, 80% is respectively selected as 118,188,291 hours.
3. a kind of performance creep according to claim 1 and the interactive research method of carburizing, it is characterised in that: described
Method for carburizing in step B are as follows: the temperature of Carburization Treatment is 1100 DEG C, strong to seep stage and carbon spread stage alternately, final oil
Cold, carburizing duration is respectively selected as 5,10 and 30 hours.
4. a kind of performance creep according to claim 1 and the interactive research method of carburizing, it is characterised in that: described
The test of Vickers hardness in step C:
A, mixcrohardness test analyzes specimen cross section using FM-800 micro Vickers, wherein sample is derived from original
Furnace tube material after beginning boiler tube, carburizing and creep uses 10gCuSO4+50mlHCl+ after edge sample, corase grinding, fine grinding, polishing
The corrosive liquid of 50mlH2O is corroded；
B, vickers hardness test is then carried out, load lotus is 300g, load time 10s, and same radial position is repeatedly surveyed
Amount is to reduce the influence of data dispersibility.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711141230.XA CN109799156A (en) | 2017-11-16 | 2017-11-16 | A kind of performance creep and the interactive research method of carburizing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711141230.XA CN109799156A (en) | 2017-11-16 | 2017-11-16 | A kind of performance creep and the interactive research method of carburizing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109799156A true CN109799156A (en) | 2019-05-24 |
Family
ID=66555933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711141230.XA Pending CN109799156A (en) | 2017-11-16 | 2017-11-16 | A kind of performance creep and the interactive research method of carburizing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109799156A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112710268A (en) * | 2020-12-23 | 2021-04-27 | 大连理工大学 | Method for nondestructively determining thickness of self-defined carburizing zone of ethylene cracking furnace tube |
-
2017
- 2017-11-16 CN CN201711141230.XA patent/CN109799156A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112710268A (en) * | 2020-12-23 | 2021-04-27 | 大连理工大学 | Method for nondestructively determining thickness of self-defined carburizing zone of ethylene cracking furnace tube |
| CN112710268B (en) * | 2020-12-23 | 2021-10-15 | 大连理工大学 | Method for nondestructively determining thickness of self-defined carburizing zone of ethylene cracking furnace tube |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Yamashita et al. | Fatigue life prediction of small notched Ti–6Al–4V specimens using critical distance | |
| CN107843510B (en) | Method for estimating residual endurance life of supercritical unit T/P91 heat-resistant steel based on room-temperature Brinell hardness prediction | |
| CN104334766A (en) | Nitrided steel member and process for producing same | |
| Abu-Nabah et al. | Eddy current residual stress profiling in surface-treated engine alloys | |
| CN109799156A (en) | A kind of performance creep and the interactive research method of carburizing | |
| Abbasi et al. | Effect of contact pressure on fretting fatigue behavior under cyclic contact loading | |
| CN103940663B (en) | The Forecasting Methodology of fatigue of materials threshold value under different stress ratios | |
| CN102721719A (en) | Method for measuring solution and precipitation temperatures of precipitated phase in steel by adopting dilation method | |
| Petersen et al. | Graphical interpretation of confidence curves in rankit plots | |
| Shimokawa et al. | Relationship between fatigue life distribution, notch configuration, and SN curve of a 2024-T4 aluminum alloy | |
| RU2488099C1 (en) | Method for x-ray diffraction control of part | |
| CN115356200A (en) | Oil well pipe hydrogen sulfide stress corrosion resistance sensitivity testing method based on fracture sample | |
| Schneider et al. | Fatigue at high number of cyclic loads: Testing methods and failure mechanism: Ermüdung bei hohen Zyklenzahlen: Prüfmethoden und Versagensverhalten | |
| Bach et al. | Constraint-based fracture mechanics analysis of cylinders with internal circumferential cracks | |
| WO2003054521A2 (en) | Method for tasting structural materials fatigue | |
| RU2767028C1 (en) | Method of determining embrittlement of material | |
| Chang et al. | P‐66: The Mechanical Properties of Aluminosilicate Glass with Chemical Strengthening | |
| CN103335922B (en) | Rapid method for testing grain size of materials | |
| Yang et al. | Notch size influence on fatigue limit of steels pertinent to grain size | |
| Chvostová et al. | Creep test with use of miniaturized specimens | |
| RU2651632C1 (en) | Method of determination of the critical temperature of steel brittleness by the cross section of the wall of the object | |
| JP2003035656A (en) | Method for estimating lifetime of bearing steel | |
| Hembara et al. | Influence of temperature and hydrogen on fatigue fracture of 10Kh15N27T3V2MR steel | |
| Åman | The influence of interacting small defects on the fatigue limit of steels-Vuorovaikuttavien pienten vikojen vaikutus terästen väsymisrajaan | |
| Al-Taher et al. | The effect of pitting corrosion on the fatigue strength of 304 and 316 stainless steel alloys |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190524 |