CN104181096A - Method for evaluating thermal ageing state of duplex stainless steel by use of thermoelectric potential - Google Patents
Method for evaluating thermal ageing state of duplex stainless steel by use of thermoelectric potential Download PDFInfo
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- CN104181096A CN104181096A CN201410455644.XA CN201410455644A CN104181096A CN 104181096 A CN104181096 A CN 104181096A CN 201410455644 A CN201410455644 A CN 201410455644A CN 104181096 A CN104181096 A CN 104181096A
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Abstract
The invention belongs to the field of metal material detection and particularly relates to a method for evaluating the thermal ageing state of duplex stainless steel by use of thermoelectric potential. The method comprises the following steps: (1) establishing a correlation algorithm unit for thermoelectric potential and a room temperature impact value of a material; (2) establishing an algorithm unit for the room temperature impact value and a thermal ageing safety factor of the material; (3) detecting the thermoelectric potential of the material on line and meanwhile obtaining the lower impact limit value of the material; and (4) according to the detected thermoelectric potential, using the detected thermoelectric potential sequentially in steps (1) and (2) to obtain the thermal ageing safety factor of the material and judging the safety of the material according to the thermal ageing safety factor of the material. Due to the use of the technical scheme, the method is capable of rapidly and accurately judging the thermal ageing state of the duplex stainless steel, so that the duplex stainless steel can be replaced in time before service invalidation and the safety of a service system of the duplex stainless steel is enhanced.
Description
Technical field
The invention belongs to metal material detection field, be specifically related to a kind of method of utilizing thermoelectrical potential to evaluate dual-phase stainless steel hot aging performance.
Background technology
In engineering field, two phase stainless steel has excellent mechanical property and good heat resistanceheat resistant crackle, corrosion-resistant and stress-corrosion-cracking resistance, is all widely applied the especially industrial circle such as chemical industry, electric power aspect a lot.But can there is " 475 DEG C of embrittlement " in two phase stainless steel after 300-500 DEG C of long service, cause the mechanical property of material to reduce, shorten the serviceable life of material.In pressurized-water reactor nuclear power plant, a primary loop piping adopts Cast Duplex Stainless Steel, under its Service Environment, heat ageing embrittlement, the operation security of serious threat nuclear power station can occur.Therefore, carry out detecting and being necessary in real time for the heat ageing of two phase stainless steel.
Be based in laboratory material is accelerated to heat ageing for traditional research method of two phase stainless steel heat ageing, test for material heat ageing mechanical property in various degree afterwards, thereby the military service performance of material is evaluated.The theoretical research that this kind of method carried out two phase stainless steel heat ageing progress for system is effectively, but the be on active service detection of lower material exists drawback for reality.Owing to comparing and having difference with actual Service Environment under laboratory condition, therefore under data and actual Service Environment there is certain gap in the True Data of material on the one hand; It is impossible carrying out traditional mechanics performance test for the material under actual Service Environment on the other hand, and this will impair the integrality of modular construction.Based on this present situation, a kind of study online detection and evaluation dual-phase stainless steel hot aging performance method is very important.
Summary of the invention
For effectively addressing the above problem, the invention provides a kind of method of utilizing thermoelectrical potential to evaluate dual-phase stainless steel hot aging performance.
Utilize thermoelectrical potential to evaluate a method for dual-phase stainless steel hot aging performance, comprise the following steps:
1) set up the ralation method unit of material thermoelectrical potential and room temperature impact value;
2) set up the algorithm unit of material room temperature impact value and heat ageing safety coefficient;
3) thermoelectrical potential of online test material is obtained material impact lower limit simultaneously;
4) according to the thermoelectrical potential recording, be applied to successively step 1) and step 2), obtain material heat ageing safety coefficient, according to heat ageing safety coefficient, material is carried out to safe judgement.
Further, described step 1) in material thermoelectrical potential and the ralation method unit of room temperature impact value, its implementation procedure is as follows: under laboratory condition, select suitable heat ageing temperature and different time node to accelerate heat ageing to two phase stainless steel, timing node is generally selected 5-6, and the two phase stainless steel after heat ageing is carried out respectively to the thermoelectrical potential test under normal room temperature shock-testing and room temperature; Carry out matching and obtain the computing formula of measure and monitor the growth of standing timber material thermoelectrical potential and room temperature impact value according to the impact numerical value of the two phase stainless steel under different time node obtained above and thermoelectrical potential numerical value.Material thermoelectrical potential and room temperature impact value computing formula have following form: C
v=Aexp (TEP/B)+C, wherein, C
vfor the room temperature impact value of material, TEP is material thermoelectrical potential value, and A, B, C are undetermined constant, relevant to tested stainless steel material itself, change for its constant of different types of two phase stainless steel.
Further, described step 2) in material room temperature impact value and the algorithm unit of heat ageing safety coefficient, computing formula is Z=C
v/ C
v0, Z is material safety evaluation coefficient, C
vfor the room temperature impact value of material, C
v0for the impact value lower limit of security regulations under material military service.
Further, in step 1) in set up behind the ralation method unit of material thermoelectrical potential and room temperature impact value, and this algorithm unit is verified.Its verification method is as follows: select another one heat ageing temperature to carry out accelerated deterioration to material, test respectively actual thermoelectrical potential value and room temperature impact value, obtain the impact value of prediction by actual thermoelectrical potential value according to the ralation method unit of above-mentioned foundation, compare actual value and the predicted value of ballistic work, verify the reliability of above-mentioned computing formula.
Further, described when Z≤1.1, material is judged as dangerous; Z > 1.1, material is judged as safety.
In the present invention, the relationship of material thermoelectrical potential and room temperature impact value is under laboratory condition, studied two-phase stainless Steel material to be tested to matching to obtain, and is different for its relational expression of different types of two phase stainless steel.
The method of detection dual-phase stainless steel hot aging performance of the present invention is owing to having adopted technique scheme, make it can determine comparatively fast, accurately dual-phase stainless steel hot aging performance, thereby before two phase stainless steel is on active service inefficacy, change in time, improved the security of its military service system.
Brief description of the drawings
Fig. 1 is process flow diagram of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is explained in further detail.Should be appreciated that specific embodiment described herein, only for explaining the present invention, is not intended to limit the present invention.
On the contrary, the present invention contain any defined by claim in marrow of the present invention and scope, make substitute, amendment, equivalent method and scheme.Further, for the public is had a better understanding to the present invention, in below details of the present invention being described, detailed some specific detail sections of having described.Do not have for a person skilled in the art the description of these detail sections can understand the present invention completely yet.
Below in conjunction with Figure of description, the present invention is described further:
Fig. 1 is FB(flow block) of the present invention, and the present invention is a kind of method of utilizing thermoelectrical potential to evaluate dual-phase stainless steel hot aging performance.
In-service duplex phase stainless tube moves a period of time heat ageing will occur under its Service Environment, affects the security of conduit running, therefore needs heat ageing situation to assess.The heat ageing evaluation system that utilizes this material to set up, adopts thermoelectrical potential measuring instrument directly on material, to carry out the thermoelectrical potential test under room temperature, realizes the non-destructive testing to material and carries out heat ageing condition evaluation.
Original stainless steel pipes material in the present embodiment is accelerated to heat ageing at 400 DEG C, digestion time is respectively 0h, 1000h, 3000h, 5000h, 7000h, 10000h, the Seebeck coefficient that material after heat ageing is carried out to the material under the test of normal room temperature impact value and room temperature, test result is as shown in table 1.
Table 1 accelerates heat ageing material impact value and thermoelectrical potential value
| Sample | Impact value J | Thermoelectrical potential value μ v/K |
| 0h | 312 | -0.9389 |
| 1000h | 134 | -0.796 |
| 3000h | 128 | -0.4654 |
| 5000h | 78 | -0.3578 |
| 7000h | 70 | -0.2801 |
| 10000h | 66 | -0.1566 |
Carry out matching according to the performance data under above-mentioned different time node, obtain thermoelectrical potential and impact value computing formula is: C
v=4.26exp (TEP/0.23)+56.95, TEP is material thermoelectrical potential value, C
vfor the room temperature impact value of material;
In order to verify the reliability of above-mentioned computing formula under different aging temperatures, select 475 DEG C material is carried out to accelerated deterioration, test respectively room temperature thermoelectrical potential value and the room temperature impact value of material after 100h, 200h heat ageing, and according to above-mentioned computing formula, room temperature impact value is predicted, result is as shown in table 2, relatively actual value and the predicted value of ballistic work, thus verify that above-mentioned computing formula is reliable.
475 DEG C of heat ageing material impact values of table 2
Set up the relationship of material room temperature impact value and heat ageing safety coefficient: Z=C
v/ C
v0, Z is material safety evaluation coefficient, C
vfor the room temperature impact value of material, C
v0for the impact value lower limit of security regulations under material military service.
This military service pipeline is carried out to online thermoelectrical potential test, measuring thermoelectrical potential is-0.4149 μ V/K, selecting the impact lower limit of the lower security regulations of this pipeline military service is 60J, and inputs this two parameters, and calculating successively heat ageing safety coefficient according to the mathematical formulae of above-mentioned foundation is 1.38;
This test material is carried out to safe judgement: Z=1.38 > 1.1, material is safe, can continue to be on active service;
To sum up, thus the invention provides utilize thermoelectrical potential to detect online and to evaluate two phase stainless steel heat ageing situation fast to material security evaluate.Be noted that above enumerate only for specific embodiments of the invention, obviously the invention is not restricted to above embodiment, have many similar variations thereupon.If all distortion that those skilled in the art directly derives or associates from content disclosed by the invention, all should belong to protection scope of the present invention.
Claims (5)
1. utilize thermoelectrical potential to evaluate a method for dual-phase stainless steel hot aging performance, it is characterized in that, comprise the following steps:
1) set up the ralation method unit of material thermoelectrical potential and room temperature impact value;
2) set up the algorithm unit of material room temperature impact value and heat ageing safety coefficient;
3) thermoelectrical potential of online test material is obtained material impact lower limit simultaneously;
4) according to the thermoelectrical potential recording, be applied to successively step 1) and step 2), obtain material heat ageing safety coefficient, according to heat ageing safety coefficient, material is carried out to safe judgement.
2. evaluate the method for dual-phase stainless steel hot aging performance according to the thermoelectrical potential of utilizing in claim 1, it is characterized in that, the material thermoelectrical potential in described step 1) and the ralation method unit of room temperature impact value, computing formula has following form: C
v=Aexp (TEP/B)+C, wherein, C
vfor the room temperature impact value of material, TEP is material thermoelectrical potential value, and A, B, C are undetermined constant, relevant to tested stainless steel material itself, change for its constant of different types of two phase stainless steel.
3. evaluate the method for dual-phase stainless steel hot aging performance according to the thermoelectrical potential of utilizing in claim 1, it is characterized in that described step 2) in material room temperature impact value and the algorithm unit of heat ageing safety coefficient, computing formula is Z=C
v/ C
v0, Z is material safety evaluation coefficient, C
vfor the room temperature impact value of material, C
v0for the impact value lower limit of security regulations under material military service.
4. evaluate the method for dual-phase stainless steel hot aging performance according to the thermoelectrical potential of utilizing in claim 1, it is characterized in that, in step 1), set up behind the ralation method unit of material thermoelectrical potential and room temperature impact value, and this algorithm unit is verified.
5. evaluate the method for dual-phase stainless steel hot aging performance according to the thermoelectrical potential of utilizing in claim 3, it is characterized in that, described when Z≤1.1, material is judged as dangerous; Z > 1.1, material is judged as safety.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108877971A (en) * | 2018-04-24 | 2018-11-23 | 苏州热工研究院有限公司 | A kind of the heat ageing monitoring device and method of nuclear power plant's main pipeline |
| CN111307854A (en) * | 2020-03-11 | 2020-06-19 | 福建宁德核电有限公司 | Thermal aging evaluation method and system for martensitic stainless steel valve rod |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108877971A (en) * | 2018-04-24 | 2018-11-23 | 苏州热工研究院有限公司 | A kind of the heat ageing monitoring device and method of nuclear power plant's main pipeline |
| CN108877971B (en) * | 2018-04-24 | 2020-07-07 | 苏州热工研究院有限公司 | Thermal aging monitoring device and method for main pipeline of nuclear power plant |
| CN111307854A (en) * | 2020-03-11 | 2020-06-19 | 福建宁德核电有限公司 | Thermal aging evaluation method and system for martensitic stainless steel valve rod |
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