CN103245569A - Material test method and system for high-temperature gas corrosion and creep - Google Patents
Material test method and system for high-temperature gas corrosion and creep Download PDFInfo
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Abstract
The invention belongs to the technical field of high-temperature gas corrosion and creep tests and particularly relates to a material test method and system for high-temperature gas corrosion and creep. A high-temperature corrosive gas circulation channel is formed in a sample, holes are formed in upper and lower pull rods of a creep machine, and the sample is connected with the upper and lower pull rods of the creep machine to form a gas channel, so that corrosive gas can circulate in the gas channel through external equipment; the sample is externally heated and an axial load applied to the sample to achieve high-temperature creep; and the corrosive gas circulates in a circulation loop. The method can be used for evaluating the influence of the combined effect of the high-temperature gas corrosion and the high-temperature creep on the material performance, studying the influence of the gas corrosion on the creep performance and the influence of the creep action on the gas corrosion, really and effectively reflecting the high-temperature mechanical performance evolution law of a material during the service period, and providing a theoretical basis for guaranteeing safe and reliable running of equipment.
Description
Technical field
The invention belongs to high-temperature gas corrosion and the creep test technical field of material, be specifically related to a kind of method of testing materials and system that realizes gas attack and creep under the high temperature.
Background technology
In the ultra supercritical unit, need to improve steam parameter, raise the efficiency and realize target for energy-saving and emission-reduction as pressure, temperature.Under actual condition, creep takes place in ultra supercritical unit boiler pipeline material easily about temperature is up to 600 ℃, and pipeline can be subjected to the influence of high temperature corrosion again in the high temperature corrosion gaseous environment.At present the existing research method in this field is only considered under the high temperature gas attack or creep single factors to effect of material performance, thus can't truly reflect the high-temperature behavior evolutionary process of material, thus can't correctly assess its residual life.
Summary of the invention
The invention provides a kind of method of testing materials and system that realizes gas attack and creep under the high temperature, can realize gas attack under high-temerature creep and the high temperature simultaneously, comprehensive assessment high-temerature creep and high-temperature gas corrosion acting in conjunction is to effect of material performance, and the researching high-temperature gas attack is to the influence to the high-temperature gas corrosion of the influence of croop property and creep behaviour.
The technical scheme that test method of the present invention adopts is:
Be provided with high temperature corrosion gas communication passage in the inside of sample, in the upper and lower pull bar internal openings of creep machine, and sample and the upper and lower pull bar of creep machine be connected, form gas passage, realize that by external unit corrosive gas circulates in passage; Outside at sample applies axial load to its heating and to sample, realizes high-temerature creep; Corrosive gas is realized circulation in closed circuit, reduce the corrosive gas use amount.
The material test system of gas attack and creep under the realization high temperature provided by the invention is made up of high-temerature creep system and the corrosive gas circulation system;
The structure of described high-temerature creep system is: the heating furnace of creep machine is the tubular furnace of hollow, and sample is placed in the heating furnace by upper connecting rod and lower link; Upper connecting rod and lower link are the part hollow structure, and its inside arranges quartz ampoule respectively, and at upper connecting rod and lower link etchant gas entrance and etchant gas outlet are set respectively; Sample is hollow structure, and two ends are tightly connected and communicate with upper connecting rod and lower link respectively; The outer wall of sample is connected with the plate of extending by tapered sleeve, and connects displacement meter in the lower end of the plate of extending;
Consisting of of the described corrosive gas circulation system: nitrogen cylinder and several corrosive gas storage bottle insert gas mixer chamber by flowmeter and air intake valve respectively, insert the etchant gas entrance by primary heater and pipeline again; The etchant gas outlet is connected with refrigeratory by pipeline, and the endpiece of refrigeratory is connected with gas mixer chamber by blower fan; Vacuum pump is connected with refrigeratory.
It is stifled that stove is installed at the two ends up and down of described heating furnace respectively.
Place pad between the two ends of described sample and the quartz ampoule respectively.
The enclose inside end of described upper connecting rod and lower link is placed spring respectively.
The connecting tube of described primary heater and etchant gas entrance, and be connected the flexible pipe of one section corrosion-and high-temp-resistant on the connecting tube that exports of refrigeratory and etchant gas respectively.
Establish a branch road on the pipeline between described refrigeratory and the vacuum pump, this branch road is connected with neutralization pond.
Beneficial effect of the present invention is:
Overcome at high-temerature creep or high-temperature gas and corroded the incomprehensive of single factors research, circulation by high temperature corrosion gas realizes high-temperature corrosion environment, can be used for researching high-temperature creep and high-temperature gas the corrosion acting in conjunction under material at high temperature performance evolutionary process, can also the learning gas corrosion corrode the influence that causes to high-temperature gas to influence and creep that creep causes, thereby accurately the disclose material mechanical behavior under high temperature evolution rule in stage under arms is for the device security reliability service provides theoretical foundation.
Description of drawings
Fig. 1 is the one-piece construction synoptic diagram of described pilot system;
Fig. 2 is heating furnace part partial structurtes synoptic diagram;
Fig. 3 holds the partial structurtes synoptic diagram at position for sample adds;
Fig. 4 is the structural representation of sample;
Fig. 5 is the structural representation of lower link.
Number in the figure:
The 1-upper connecting rod; The 2-heating furnace; The 3-tapered sleeve; The 4-sample; The 5-pad; The 6-lower link; The 7-displacement meter; Spherical Connection Block under the 8-; The 9-handwheel; The 10-balance weight; The 11-column; The outlet of 12-etchant gas; The 13-upper grip; The 14-lower chuck; The 15-plate of extending; The 16-stove is stifled; 17-etchant gas entrance; The 18-quartz ampoule; 19-spring; The 20-control desk; 21-corrosion-and high-temp-resistant flexible pipe; The 22-primary heater; The 23-gas mixer chamber; The 24-nitrogen cylinder; 25,26-corrosive gas storage bottle; 27-corrosion-and high-temp-resistant flexible pipe; The 28-refrigeratory; The 29-blower fan; The 30-air intake valve; The 31-neutralization pond; The 32-flowmeter; 33-vacuum pump valve; The 34-vacuum pump; 35-blower fan valve; 36-neutralization pond valve; 37-lower link circular hole.
Embodiment
The invention provides a kind of method of testing materials and system that realizes gas attack and creep under the high temperature, the present invention will be further described below in conjunction with the drawings and specific embodiments.
System of the present invention is made up of high-temerature creep system and the corrosive gas circulation system, and as shown in Figure 1, wherein the concrete structure of heating furnace part is as shown in Figure 2 in the high-temerature creep system.
The structure of high-temerature creep system is: the heating furnace 2 of creep machine is fixed on the column 11 of creep machine, and heating furnace 2 is the tubular furnace of hollow, and sample 4 is connected with lower link 6 with upper connecting rod 1 by screw thread and is placed in the heating furnace 2; Upper connecting rod 1 and lower link 6 are the part hollow structure, and its inside arranges quartz ampoule 18 respectively, and at upper connecting rod 1 and lower link 6 etchant gas entrance 17 and etchant gas outlet 12 are set respectively; The enclose inside end of upper connecting rod 1 and lower link 2 is placed spring 19 respectively; Sample 4 is hollow structure, and two ends are tightly connected and communicate with upper connecting rod 1 and lower link 6 respectively, places pad 5 respectively between the two ends of sample 4 and the quartz ampoule 18, is used for guaranteeing sealing; The outer wall of sample 4 is connected by tapered sleeve 3, upper grip 13, lower chuck 14 and the plate 15 of extending, and connects displacement meter 7 in the lower end of the plate 15 of extending; Stove stifled 16 is installed at the two ends up and down of heating furnace 2 respectively; Balance weight 10 is equipped with at the top of creep machine, and the lower end of lower link 6 is connected with following spherical Connection Block 8, and handwheel 9 is installed.
Consisting of of the corrosive gas circulation system: nitrogen cylinder 24 and corrosive gas storage bottle 25,26 insert gas mixer chamber 23 by flowmeter 32 and air intake valve 30 respectively, insert etchant gas entrance 17 by primary heater 22 and pipeline again; Etchant gas outlet 12 is connected with refrigeratory 28 by pipeline, and the endpiece of refrigeratory 28 passes through blower fan 29 and is connected with gas mixer chamber 23; Vacuum pump 34 is connected with refrigeratory 28.The connecting tube of primary heater 22 and etchant gas entrance 17, and on the connecting tube of refrigeratory 28 and etchant gas outlet 12 one section corrosion-and high-temp-resistant flexible pipe 21 and 27 are set respectively; On the pipeline between refrigeratory 28 and the vacuum pump 34 branch road is set, this branch road is connected with neutralization pond 31.
Pipeline in the pilot system is all used corrosion resistant quartz pipe except two place's flexible pipes 21 and 27.High-temerature creep takes place and can extend in sample 4, and the upper and lower clearance between tiebars that connects sample can change, and the pipeline that is fixed on upper and lower pull bar gas import and export place can be ensued movement, therefore eliminates the influence that this movement brings with two place's flexible pipes.
Creep machine passes to sample 4 by upper connecting rod 1 and lower link 6 with the load that loads.Owing to be subjected to the influence of high-temerature creep, sample can extend in the process of the test, the elongation of sample by be clamped in sample up and down the plate 15 of extending at two ends pass to the displacement meter 7 that is fixed on the plate lower end of extending, displacement meter is transferred to computer recording with the elongation of measuring.
The inside, upper end of lower link has cylindrical aperture.When sample is installed, earlier spring 19 is put into lower link 6 cylindrical holes bottom, put into quartz ampoule 18, pad 5 afterwards, at last sample 4 is screwed in the screw thread of lower link, make spring 19 be in impaction state, and guarantee that the contact of pad 5 places is good.The corrosive gas quartz ampoule 18 of flowing through enters sample 4 inside, corrodes at the sample inside surface.The effect of quartz ampoule 18 is to prevent from that corrosive gas from contacting with lower link 6 to corrode.Consider that quartz ampoule 18 is littler than the thermal expansivity of lower link 6, when flowing through high-temperature gas, the elongation of lower link 6 is big, can produce the gap between pad 5 and the sample 4, and is poorly sealed close.In order to eliminate this phenomenon, below quartz ampoule 18, place a spring 19, and make spring be in impaction state, when producing the gap, spring flicks a part and eliminates the gap, guarantees that sealing is tight.After spring flicked a part, very little slip can take place in quartz ampoule and lower link, and the draft tube that links to each other with air intake opening on the quartz ampoule also can and then move, and in order not influence the movement of draft tube, opened a bigger lower link circular hole 37 of diameter in the lower link bottom.The structure of upper connecting rod and principle are identical with lower link.
The use of this system and the course of work are:
(1) upper connecting rod 1, lower link 6 are connected with sample 4;
(2) will extend plate 15 is connected with sample 4 by last lower chuck.
(3) thermopair is bundled on the sample;
(4) slowly put down heating furnace 2, by the good test parameters of computer installation, heating furnace begins heating;
(5) gas mixer chamber 23 is connected with primary heater 22, then primary heater is connected to etchant gas entrance 17, etchant gas outlet 12 is connected with refrigeratory 28, refrigeratory is connected with blower fan 29, blower fan is connected with gas mixer chamber, finishes the connection of external units such as corrosive gas circulation passage;
When (6) heating furnace heats up, open blower fan valve 35, vacuum pump valve 33, keep air intake valve 30, neutralization pond valve 36 to close.Opening vacuum pump 34 vacuumizes pipe interior.
(7) form vacuum in waiting to manage after, close vacuum pump and vacuum pump valve, open air intake valve, feed corrosive gas, treat that corrosive gas is full of pipeline after, open blower fan 29, close air intake valve, realize the etchant gas circulation.
(8) treat that temperature conditions satisfies requirement of experiment, begin to load that test formally begins.
(9) experimental stage is got back to gas mixer chamber 23 behind gas gas coming through mixing chamber 23, primary heater 22, lower link 6, sample 4, upper connecting rod 1, refrigeratory 28, the blower fan 29, forms closed circuit.Realize that in closed circuit the circulation of gas can reduce the use amount of corrosive gas.Gas carries out preheating in primary heater 22, can reduce the temperature difference to the influence of sample.The quartz ampoules 18 that gas after the preheating is flowed through in the lower link 6 enter sample 4 inside, corrode at the sample inside surface, realize corroding and the acting in conjunction of high-temerature creep.The blower fan that native system uses is corrosion resistant fan.The effect of refrigeratory is to reduce the blower fan working temperature, prolongs blower fan serviceable life.
(10) test ending phase, open air intake valve and the neutralization pond valve 36 of nitrogen cylinder 21, close blower fan valve 35 and blower fan 29, in system, feed nitrogen, intrasystem corrosive gas is entered neutralization pond 31.Treat to close all valves after etchant gas drains, and stop creep test.In order to prevent that the sample fracture etchant gas from bleeding in the environment, stopped test before sample generation creep rupture.
Claims (7)
1. method of testing materials that realizes gas attack and creep under the high temperature, it is characterized in that: be provided with high temperature corrosion gas communication passage in the inside of sample, upper and lower pull bar internal openings in creep machine, and sample and the upper and lower pull bar of creep machine be connected, form gas passage, realize that by external unit corrosive gas circulates in passage; Outside at sample applies axial load to its heating and to sample, realizes high-temerature creep; Corrosive gas is realized circulation in closed circuit, reduce the corrosive gas use amount.
2. a material test system of realizing gas attack and creep under the high temperature is characterized in that, is made up of high-temerature creep system and the corrosive gas circulation system;
The structure of described high-temerature creep system is: the heating furnace of creep machine (2) is the tubular furnace of hollow, and sample (4) is placed in the heating furnace (2) by upper connecting rod (1) and lower link (6); Upper connecting rod (1) and lower link (6) are the part hollow structure, and its inside arranges quartz ampoule (18) respectively, and at upper connecting rod (1) and lower link (6) etchant gas entrance and etchant gas outlet are set respectively; Sample (4) is hollow structure, and two ends are tightly connected and communicate with upper connecting rod (1) and lower link (6) respectively; The outer wall of sample (4) is connected with the plate of extending (15) by tapered sleeve (3), and connects displacement meter (7) in the lower end of the plate of extending (15);
Consisting of of the described corrosive gas circulation system: nitrogen cylinder and several corrosive gas storage bottle insert gas mixer chamber (23) by flowmeter and air intake valve respectively, insert the etchant gas entrance by primary heater (22) and pipeline again; The etchant gas outlet is connected with refrigeratory (28) by pipeline, and the endpiece of refrigeratory (28) is connected with gas mixer chamber (23) by blower fan (29); Vacuum pump (34) is connected with refrigeratory (28).
3. a kind of material test system of realizing gas attack and creep under the high temperature according to claim 2, it is characterized in that described gas mixer chamber (23), primary heater (22), lower link (6), sample (4), upper connecting rod (1), refrigeratory (28), blower fan (29), gas mixer chamber (23) link to each other successively and form closed circuit.
4. a kind of material test system of realizing gas attack and creep under the high temperature according to claim 2 is characterized in that, places pad (5) respectively between the two ends of described sample (4) and the quartz ampoule (18).
5. a kind of material test system of realizing gas attack and creep under the high temperature according to claim 2 is characterized in that the enclose inside end of described upper connecting rod (1) and lower link (2) is placed spring (19) respectively.
6. a kind of material test system of realizing gas attack and creep under the high temperature according to claim 2, it is characterized in that, the connecting tube of described primary heater (22) and etchant gas entrance, and be connected the flexible pipe of one section corrosion-and high-temp-resistant on refrigeratory (28) and the connecting tube that etchant gas exports respectively.
7. a kind of material test system of realizing gas attack and creep under the high temperature according to claim 2 is characterized in that establish a branch road on the pipeline between described refrigeratory (28) and the vacuum pump (34), this branch road is connected with neutralization pond (31).
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| RU2579643C1 (en) * | 2014-12-22 | 2016-04-10 | Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" - Госкорпорация "Росатом" | Apparatus for mechanical tests in conditions of low-cycle loading of samples from toxic materials |
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| CN104458470A (en) * | 2014-12-10 | 2015-03-25 | 北京科技大学 | Loading system for tubular specimens with internal and external high-temperature flowing water |
| CN104458470B (en) * | 2014-12-10 | 2017-05-10 | 北京科技大学 | Loading system for tubular specimens with internal and external high-temperature flowing water |
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| CN105203402B (en) * | 2015-11-03 | 2018-04-10 | 华北电力大学 | The device and method of pyrogenic steam oxidation and test for stress corrosion cracking is realized simultaneously |
| CN105203402A (en) * | 2015-11-03 | 2015-12-30 | 华北电力大学 | Device and method for realizing high-temperature steam oxidation and stress corrosion cracking tests simultaneously |
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| CN105572028A (en) * | 2016-03-03 | 2016-05-11 | 中国计量学院 | Simulated boiler high-temperature smoke gas corrosion test device |
| CN105842081A (en) * | 2016-05-06 | 2016-08-10 | 华能国际电力股份有限公司 | High-temperature endurance test device and method for environmental corrosion |
| CN108519321B (en) * | 2016-06-16 | 2020-07-28 | 天津大学 | Method for testing by using welding joint force-corrosion coupling testing device |
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| CN106153472A (en) * | 2016-06-17 | 2016-11-23 | 华北电力大学 | A kind of realize multi-axial creep pilot system and the method that intrinsic pressure and stretching combinations loads |
| CN106840849A (en) * | 2017-02-16 | 2017-06-13 | 北京科技大学 | A kind of Metal Materials At High Temperature corrosive environment deformation measuring device |
| CN106885664A (en) * | 2017-02-24 | 2017-06-23 | 长春机械科学研究院有限公司 | Suitable for the sag method of testing and device of vacuum environment |
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| CN108169433A (en) * | 2018-03-23 | 2018-06-15 | 安徽工业大学 | Exchange heat pipe coating detection device and detection method |
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| CN112285012A (en) * | 2020-11-26 | 2021-01-29 | 武汉工程大学 | Creep fatigue test system |
| CN113588446A (en) * | 2021-08-10 | 2021-11-02 | 中机试验装备股份有限公司 | Tensile creep test device |
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| CN116519493A (en) * | 2023-05-06 | 2023-08-01 | 天津大学 | High-temperature creep vacuum/atmosphere environment device |
| CN116519493B (en) * | 2023-05-06 | 2024-01-19 | 天津大学 | High-temperature creep vacuum/atmosphere environment device |
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