CN107727497B - A kind of acquisition methods for austenitic stainless steel this structure curve considering Room Temperature Creep - Google Patents
A kind of acquisition methods for austenitic stainless steel this structure curve considering Room Temperature Creep Download PDFInfo
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- CN107727497B CN107727497B CN201710857139.1A CN201710857139A CN107727497B CN 107727497 B CN107727497 B CN 107727497B CN 201710857139 A CN201710857139 A CN 201710857139A CN 107727497 B CN107727497 B CN 107727497B
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- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 18
- 238000009864 tensile test Methods 0.000 claims description 5
- 229910001566 austenite Inorganic materials 0.000 claims description 4
- 238000010998 test method Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims 1
- 239000010959 steel Substances 0.000 claims 1
- 238000004364 calculation method Methods 0.000 abstract description 5
- 238000004088 simulation Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract 1
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- 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
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- 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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
-
- 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
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0071—Creep
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- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention relates to austenitic stainless steel processing technologies, it is desirable to provide a kind of acquisition methods for austenitic stainless steel this structure curve for considering Room Temperature Creep.Include: to protect to carry test by the stretching of austenitic stainless steel material, obtains the initial data of building this structure curve；Respectively to set stress σ and overall strain amount ε as horizontal, ordinate, mark point (σ1,ε1),(σ2,ε2),…,(σn,εn), by fitting, ε change curve relevant to stress σ is established, which is austenitic stainless steel this structure curve for considering Room Temperature Creep influence.Compared with prior art, the present invention is during obtaining this structure of austenitic stainless steel curve, it is contemplated that the influence that Room Temperature Creep generates this structure curve.By the regulation to data determination method and time calculation formula etc., this structure curve finally obtained is in the stress strain response theoretical calculation and simulation and prediction of the austenitic stainless steel material or structure that are applied to the later period, precision of prediction can be significantly improved, prediction result is more acurrate.
Description
Technical field
The present invention relates to austenitic stainless steel this structure curves, in particular to this structure of the austenitic stainless steel of consideration Room Temperature Creep
The acquisition methods of curve.
Background technique
At room temperature austenitic stainless steel has apparent Room Temperature Creep characteristic, i.e., stablize when material over time bears one
Higher than yield strength stress when, more apparent Room Temperature Creep can be occurred, such as strong in the strain of austenite stainless steel
In the strain hardening process for changing moldeed depth cold containers, material is protected load 1 hour or more in the case where strengthening pressure, and protecting will during carrying
There is Room Temperature Creep phenomenon, total gradually expands, and the creep compliance finally generated is up to 1%~2%.
Current austenitic stainless steel room temperature this structure curve is this structure song for considering the various factors such as processing hardening
Line is commonly used for the stress strain response theoretical calculation and simulation and prediction of austenitic stainless steel material or structure.Above-mentioned strain is strong
The result of chemical industry skill also carrys out look-ahead frequently with numerical value calculating.However, this structure curve used in these current predictions is not
Consider that Room Temperature Creep bring influences, therefore calculated result is also without including Room Temperature Creep.If can consider in finite element simulation
The Room Temperature Creep effect of material considers the influence of Room Temperature Creep, then in emulation austenitic stainless steel this structure curve used
Prediction result can be made closer with actual result, prediction is more acurrate, significantly improves precision of prediction.
Summary of the invention
The technical problem to be solved by the present invention is to overcome deficiency in the prior art, provide and a kind of consider Room Temperature Creep
The acquisition methods of austenitic stainless steel this structure curve.
To solve this technical problem, the technical scheme is that
A kind of acquisition methods of austenitic stainless steel this structure curve considering Room Temperature Creep are provided, comprising the following steps:
(1) it is protected by the stretching of austenitic stainless steel material and carries test, obtain the initial data of building this structure curve:
The austenitic stainless steel processed needed for taking is as sample, establishing criteria GB/T 228.1-2010 " material during tensile
Test part 1: room temperature test method " carry out tensile test at room temperature；It is controlled during the test using power, with the drawing of phase same rate
Load is kept after stretching sample to setting stress σ, load time T (σ) is protected and is calculate by the following formula:
In above formula:It is for the strain rate that artificial settings wishes to reach at the end of Room Temperature Creep, i.e., when strain rate is lower than
It is equal toWhen just terminate creep；σ is setting stress, units MPa；Δ T is the corresponding time when occurring with the strain rate of setting,
Unit is s, i.e., (Δ T in occur strain)/
After the completion of test, test data is acquired, obtains the overall strain amount ε for protecting and carrying material when completing；
Setting stress σ takes different stress value { σ1,σ2,…,σn, by above-mentioned test process, obtain corresponding overall strain
Amount, is denoted as { ε1,ε2,…,εn, the value range of n be [10 ,+∞), σnValue range be (0, tensile strength as defined in standard
Lower limit value]；
(2) respectively to set stress σ and overall strain amount ε as horizontal, ordinate, mark point (σ1,ε1),(σ2,ε2),…,(σn,
εn), by fitting, ε change curve relevant to stress σ is established, which is the austenite for considering Room Temperature Creep influence
Stainless steel this structure curve.
Compared with prior art, the beneficial effects of the present invention are:
The present invention is during obtaining this structure of austenitic stainless steel curve, it is contemplated that Room Temperature Creep generates this structure curve
Influence.By the regulation to data determination method and time calculation formula etc., this structure curve finally obtained is after being applied to
When the austenitic stainless steel material of phase or the stress strain response theoretical calculation of structure and simulation and prediction, prediction can be significantly improved
Precision, prediction result are more acurrate.
Detailed description of the invention
Fig. 1 is this structure curve synoptic diagram of the austenitic stainless steel before and after considering that Room Temperature Creep influences.
Specific embodiment
Below with reference to specific example, to austenitic stainless steel this structure curve for considering Room Temperature Creep proposed by the invention
Acquisition methods are described further:
(1) it is protected by the stretching of austenitic stainless steel material and carries test, obtain the initial data of building this structure curve:
The austenitic stainless steel processed needed for taking is as sample, establishing criteria GB/T 228.1-2010 " material during tensile
Test part 1: room temperature test method " carry out tensile test at room temperature；Test process is controlled using power, with the examination of identical rate tensile
Load is kept after sample to setting stress σ, load time T (σ) is protected and is calculate by the following formula:
In above formula:It is for the strain rate that artificial settings wishes to reach at the end of Room Temperature Creep, i.e., when strain rate is lower than
It is equal toWhen just terminate creep；Δ T is that when occurring with the strain rate of setting corresponding time, unit s (occur in Δ T
Strain)/σ is setting stress, units MPa；
Here, it is assumed thatFor 2.78e-7, Δ T is set as 900s, then protects and carry the time are as follows:
After the completion of test, test data is acquired, obtains the overall strain amount ε for protecting and carrying material when completing；
Setting stress σ takes different stress value { σ1,σ2,…,σn, by above-mentioned test process, obtain corresponding overall strain
Amount, is denoted as { ε1,ε2,…,εn, the value range of n be [10 ,+∞), σnValue range be (0, tensile strength as defined in standard
Lower limit value]；
(2) respectively to set stress σ and overall strain amount ε as horizontal, ordinate, mark point (σ1,ε1),(σ2,ε2),…,(σn,
εn), by fitting, ε change curve relevant to stress σ is established, which is the austenite for considering Room Temperature Creep influence
Stainless steel this structure curve.
In practice, the value quantity n of setting stress σ can control at 10 to 50.In this way, in foundation and stress
When the relevant ε change curve of σ, just there are 10 to 50 mark points.This quantitative range be it is proper, can obtain shape compared with
For accurate, smooth, continuous curve, and test and data processing load will not be caused excessive due to overabundance of data.
It is influenced when considering Room Temperature Creep, significant change will occur for this structure curve of austenitic stainless steel, such as 1 institute of attached drawing
Show, after considering that Room Temperature Creep influences, this structure curve of material starts to deviate to the right near yield point, and stress is bigger, offset
Strain that absolute value is bigger, i.e., using considering the austenitic stainless steel of Room Temperature Creep this structure curve prediction real material and structure
When response, strain level can be higher, and prediction result is closer with actual conditions, and precision of prediction is higher.
Claims (1)
1. a kind of acquisition methods for austenitic stainless steel this structure curve for considering Room Temperature Creep, which is characterized in that including following step
It is rapid:
(1) it is protected by the stretching of austenitic stainless steel material and carries test, obtain the initial data of building this structure curve:
The austenitic stainless steel processed needed for taking is as sample, establishing criteria GB/T 228.1-2010 " material during tensile examination
Test part 1: room temperature test method " carry out tensile test at room temperature；It is controlled during the test using power, with the drawing of phase same rate
Load is kept after stretching sample to setting stress σ, load time T (σ) is protected and is calculate by the following formula:
In above formula:It is for the strain rate being manually set at the end of Room Temperature Creep, when Room Temperature Creep actual strain rate is equal to or low
InWhen, terminate creep；σ is setting stress, units MPa；Δ T is the corresponding time when occurring with the strain rate of setting, single
Position is s, i.e., (Δ T in occur strain)/
After the completion of test, test data is acquired, obtains the overall strain amount ε for protecting and carrying material when completing；
Setting stress σ takes different stress value { σ1, σ2..., σn, by above-mentioned test process, corresponding overall strain amount is obtained,
It is denoted as { ε1, ε2..., εn, the value range of n be [10 ,+∞), σnValue range be (0, under tensile strength as defined in standard
Limit value]；
(2) respectively to set stress σ and overall strain amount ε as horizontal, ordinate, mark point (σ1, ε1), (σ2, ε2) ..., (σn, εn),
By fitting, ε change curve relevant to stress σ is established, which is the austenite stainless for considering Room Temperature Creep influence
Steel this structure curve.
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| CN110119542B (en) * | 2019-04-22 | 2023-06-27 | 一汽-大众汽车有限公司 | Prediction method for bearing performance of anti-collision part of hot formed car body with soft and hard partitions |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1793824A (en) * | 2005-12-20 | 2006-06-28 | 西安交通大学 | Method of testing room temperature press-in creeping performance of metal film |
| JP2008209262A (en) * | 2007-02-27 | 2008-09-11 | Akita Univ | Quick evaluation method of elasticity, plasticity, and creep characteristic |
| CN103320592A (en) * | 2013-05-28 | 2013-09-25 | 浙江大学 | Method for predicting dwell time for strain-strengthening austenitic stainless steel low temperature container |
| CN106769440A (en) * | 2016-11-14 | 2017-05-31 | 宜兴华威封头有限公司 | A kind of processing method of strain hardening tensile sample |
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| US9645041B2 (en) * | 2012-02-06 | 2017-05-09 | Endurica Llc | Interpolation engine for analysis of time-varying load data signals |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1793824A (en) * | 2005-12-20 | 2006-06-28 | 西安交通大学 | Method of testing room temperature press-in creeping performance of metal film |
| JP2008209262A (en) * | 2007-02-27 | 2008-09-11 | Akita Univ | Quick evaluation method of elasticity, plasticity, and creep characteristic |
| CN103320592A (en) * | 2013-05-28 | 2013-09-25 | 浙江大学 | Method for predicting dwell time for strain-strengthening austenitic stainless steel low temperature container |
| CN106769440A (en) * | 2016-11-14 | 2017-05-31 | 宜兴华威封头有限公司 | A kind of processing method of strain hardening tensile sample |
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