CN103245569B - A kind of method of testing materials and system realizing gas attack and creep under high temperature - Google Patents
A kind of method of testing materials and system realizing gas attack and creep under high temperature Download PDFInfo
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- CN103245569B CN103245569B CN201310155911.7A CN201310155911A CN103245569B CN 103245569 B CN103245569 B CN 103245569B CN 201310155911 A CN201310155911 A CN 201310155911A CN 103245569 B CN103245569 B CN 103245569B
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Abstract
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 the system that realize gas attack and creep under high temperature.By being provided with high temperature corrosion air ventilation 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 are connected, form gas passage, realize corrosive gas at passage Inner eycle by external unit; In the outside of sample, it heated and axial load is applied to sample, realizing high-temerature creep; Corrosive gas realizes circulation in closed circuit.The method can be used for the corrosion of assessment high-temperature gas with high-temerature creep acting in conjunction to the impact of material property, learning gas corrosion on the impact of croop property and creep behaviour on the impact of gas attack, the mechanical behavior under high temperature Evolution in more authentic and valid reflection material stage under arms, for ensureing that device security reliability service provides theoretical foundation.
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 the system that realize gas attack and creep under high temperature.
Background technology
In extra-supercritical unit, need to improve steam parameter, as pressure, temperature are raised the efficiency and realize target for energy-saving and emission-reduction.Under actual condition, easily there is creep temperatures as high about 600 DEG C in Boiler of Ultra-supercritical Unit pipeline material, and pipeline can be subject to again the impact of high temperature corrosion in high temperature corrosion gaseous environment.At present the existing research method in this field only considers that gas attack or creep single factors, on the impact of material property, so truly cannot reflect the high-temperature behavior evolutionary process of material, thus cannot correctly assess its residual life under high temperature.
Summary of the invention
The invention provides a kind of method of testing materials and the system that realize gas attack and creep under high temperature, gas attack under high-temerature creep and high temperature can be realized simultaneously, comprehensive assessment high-temerature creep and high-temperature gas corrode acting in conjunction to the impact of material property, the impact that researching high-temperature gas attack corrodes high-temperature gas the impact of croop property and creep behaviour.
The technical scheme that test method of the present invention adopts is:
Be provided with high temperature corrosion air ventilation 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 corrosive gas at passage Inner eycle by external unit; In the outside of sample, it heated and axial load is applied to sample, realizing high-temerature creep; Corrosive gas realizes circulation in closed circuit, reduces corrosive gas use amount.
The material test system realizing gas attack and creep under 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 heating furnace by upper connecting rod and lower link; Upper connecting rod and lower link are part hollow structure, and its inside arranges quartz ampoule respectively, and on upper connecting rod and lower link, arrange etchant gas entrance and etchant gas outlet respectively; Sample is hollow structure, and two ends are tightly connected with upper connecting rod and lower link respectively and communicate; The outer wall of sample is connected with plate of extending by tapered sleeve, and connects displacement meter in the lower end of plate of extending;
Consisting of of the described corrosive gas circulation system: nitrogen cylinder and several corrosive gas storage bottle access gas mixer chamber respectively by flowmeter and air intake valve, then by primary heater and pipeline access etchant gas entrance; 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.
The two ends up and down of described heating furnace are installed stove respectively and are blocked up.
Pad is placed respectively between the two ends of described sample and quartz ampoule.
The enclose inside end of described upper connecting rod and lower link places spring respectively.
The connecting tube of described primary heater and etchant gas entrance, and the flexible pipe connecting tube that exports of refrigeratory and etchant gas being connected respectively one section of corrosion-and high-temp-resistant.
Pipeline between described refrigeratory and vacuum pump is established a branch road, this branch road is connected with neutralization pond.
Beneficial effect of the present invention is:
Overcome and corrode the incomprehensive of single factors research for high-temerature creep or high-temperature gas, high-temperature corrosion environment is realized by the circulation of high temperature corrosion gas, can be used for researching high-temperature creep and high-temperature gas corrosion acting in conjunction under material at high temperature property evolution process, learning gas corrosion impact that creep is caused and creep can also corrode the impact caused to high-temperature gas, thus the mechanical behavior under high temperature Evolution in accurately disclose material stage under arms, for device security reliability service provides theoretical foundation.
Accompanying drawing explanation
Fig. 1 is the one-piece construction schematic diagram of described pilot system;
Fig. 2 is heating furnace part partial structurtes schematic diagram;
Fig. 3 is the partial structurtes schematic diagram that sample accommodates position;
Fig. 4 is the structural representation of sample;
Fig. 5 is the structural representation of lower link.
Number in the figure:
1-upper connecting rod; 2-heating furnace; 3-tapered sleeve; 4-sample; 5-pad; 6-lower link; 7-displacement meter; Spherical Connection Block under 8-; 9-handwheel; 10-balance weight; 11-column; 12-etchant gas exports; 13-upper grip; 14-lower chuck; 15-extends plate; 16-stove blocks up; 17-etchant gas entrance; 18-quartz ampoule; 19-spring; 20-control desk; 21-corrosion-and high-temp-resistant flexible pipe; 22-primary heater; 23-gas mixer chamber; 24-nitrogen cylinder; 25,26-corrosive gas storage bottle; 27-corrosion-and high-temp-resistant flexible pipe; 28-refrigeratory; 29-blower fan; 30-air intake valve; 31-neutralization pond; 32-flowmeter; 33-vacuum pump valve; 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 the system that realize gas attack and creep under high temperature, below in conjunction with the drawings and specific embodiments, the present invention will be further described.
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 in high-temerature creep system, the concrete structure of heating furnace part is as shown in Figure 2.
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 to be connected with upper connecting rod 1 and lower link 6 by screw thread and to be placed in heating furnace 2; Upper connecting rod 1 and lower link 6 are part hollow structure, and its inside arranges quartz ampoule 18 respectively, and on upper connecting rod 1 and lower link 6, arrange etchant gas entrance 17 and etchant gas outlet 12 respectively; The enclose inside end of upper connecting rod 1 and lower link 2 places spring 19 respectively; Sample 4 is hollow structure, and two ends are tightly connected with upper connecting rod 1 and lower link 6 and communicate respectively, places pad 5 respectively between the two ends of sample 4 and quartz ampoule 18, is used for ensureing sealing; The outer wall of sample 4 is connected by tapered sleeve 3, upper grip 13, lower chuck 14 and plate 15 of extending, and connects displacement meter 7 in the lower end of 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 lower spherical Connection Block 8, and installs handwheel 9.
Consisting of of the corrosive gas circulation system: nitrogen cylinder 24 and corrosive gas storage bottle 25,26 access gas mixer chamber 23 respectively by flowmeter 32 and air intake valve 30, then by primary heater 22 and pipeline access etchant gas entrance 17; Etchant gas outlet 12 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.The connecting tube of primary heater 22 and etchant gas entrance 17, and refrigeratory 28 exports on the connecting tube of 12 with etchant gas and arranges one section of corrosion-and high-temp-resistant flexible pipe 21 and 27 respectively; Pipeline between refrigeratory 28 and vacuum pump 34 arranges branch road, and this branch road is connected with neutralization pond 31.
Pipeline in pilot system all uses corrosion resistant quartz pipe except two place's flexible pipes 21 and 27.There is high-temerature creep and can extend in sample 4, connecting the upper and lower clearance between tiebars of sample can change, and the pipeline being fixed on upper and lower pull bar gas import and export place can ensue movement, therefore eliminates with two place's flexible pipes the impact that this movement brings.
Creep machine by upper connecting rod 1 and lower link 6 by the dynamic changes process that loads to sample 4.Due to the impact by high-temerature creep in process of the test, sample can extend, and the elongation of sample passes to by the plate 15 of extending being clamped in the upper and lower two ends of sample the displacement meter 7 being fixed on plate lower end of extending, and the elongation of measurement is transferred to computer recording by displacement meter.
The upper end of lower link is inner with cylindrical aperture.When sample is installed, first spring 19 is put into bottom lower link 6 cylindrical hole, put into quartz ampoule 18, pad 5 afterwards, finally sample 4 is screwed in the screw thread of lower link, make spring 19 be in impaction state, and ensure that the contact of pad 5 place is good.Corrosive gas flows through quartz ampoule 18 and enters sample 4 inside, corrodes at sample inside surface.The effect of quartz ampoule 18 prevents from corrosive gas from contacting with lower link 6 to corrode.Consider that quartz ampoule 18 is less than the thermal expansivity of lower link 6, when flowing through high-temperature gas, the elongation of lower link 6 is large, can produce gap between pad 5 and sample 4, poorly sealed close.In order to eliminate this phenomenon, placing a spring 19, and make spring be in impaction state below quartz ampoule 18, when producing gap, spring flicks a part to eliminate gap, ensures that sealing is tight.After spring flicks a part, can there is very little slip in quartz ampoule and lower link, and the draft tube be connected with the enterprising gas port of quartz ampoule also can and then movement, in order to not affect the movement of draft tube, opens the lower link circular hole 37 that a diameter is larger in lower link bottom.Structure and the principle of upper connecting rod 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) plate 15 of extending is connected with sample 4 by upper lower chuck.
(3) thermopair is bundled on sample;
(4) slowly put down heating furnace 2, by the good test parameters of computer installation, heating furnace starts 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, completes the connection of the external units such as corrosive gas circulation passage;
(6) while heating furnace heats up, open blower fan valve 35, vacuum pump valve 33, maintenance air intake valve 30, neutralization pond valve 36 are closed.Open vacuum pump 34 pipe interior is vacuumized.
(7) after managing interior formation vacuum, close vacuum pump and vacuum pump valve, open air intake valve, pass into corrosive gas, be full of after pipeline until corrosive gas, open blower fan 29, close air intake valve, realize etchant gas circulation.
(8) treat that temperature conditions meets requirement of experiment, start to load, test formally starts.
(9) experimental stage, gas flow gets back to gas mixer chamber 23 after gas mixer chamber 23, primary heater 22, lower link 6, sample 4, upper connecting rod 1, refrigeratory 28, blower fan 29, forms closed circuit.The circulation realizing gas in closed circuit can reduce the use amount of corrosive gas.Gas carries out preheating in primary heater 22, can reduce the impact of the temperature difference on sample.It is inner that the quartz ampoule 18 of gas flow after preheating in lower link 6 enters sample 4, corrodes at sample inside surface, realizes the acting in conjunction of corrosion and high-temerature creep.The blower fan that native system uses is corrosion resistant fan.The effect of refrigeratory reduces blower fan working temperature, extends service life of fan.
(10) test ending phase, open air intake valve and the neutralization pond valve 36 of nitrogen cylinder 24, close blower fan valve 35 and blower fan 29, in system, pass into nitrogen, intrasystem corrosive gas is entered neutralization pond 31.After etchant gas drains, close all valves, and stop creep test.In order to prevent sample fracture etchant gas from bleeding in environment, before sample generation creep rupture, stop test.
Claims (2)
1. realize a material test system for gas attack and creep under high temperature, it is characterized in that, be made up of high-temerature creep system and the corrosive gas circulation system;
The structure of described high-temerature creep system is: the tubular furnace that the heating furnace (2) of creep machine is hollow, and sample (4) is placed in heating furnace (2) by upper connecting rod (1) and lower link (6); Upper connecting rod (1) and lower link (6) are part hollow structure, its inside arranges quartz ampoule (18) respectively, and on upper connecting rod (1) and lower link (6), arrange etchant gas entrance and etchant gas outlet respectively; Sample (4) is hollow structure, and two ends are tightly connected with upper connecting rod (1) and lower link (6) and communicate respectively; The outer wall of sample (4) is connected with plate of extending (15) by tapered sleeve (3), and connects displacement meter (7) in the lower end of plate of extending (15); Pad (5) is placed respectively between the two ends of described sample (4) and quartz ampoule (18); The enclose inside end of described upper connecting rod (1) and lower link (6) places spring (19) respectively; Balance weight (10) is equipped with at the top of creep machine, and the lower end of lower link (6) is connected with lower spherical Connection Block (8), and installs handwheel (9);
Consisting of of the described corrosive gas circulation system: nitrogen cylinder and several corrosive gas storage bottle access gas mixer chamber (23) respectively by flowmeter and air intake valve, then by primary heater (22) and pipeline access etchant gas entrance; 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); The connecting tube of described primary heater (22) and etchant gas entrance, and the flexible pipe connecting tube that exports of refrigeratory (28) and etchant gas being connected respectively one section of corrosion-and high-temp-resistant, other section of tubing of system are quartz pipe;
Pipeline between described refrigeratory (28) and vacuum pump (34) establishes a branch road, and this branch road is connected with neutralization pond (31) by neutralization pond valve (36);
The working method of described system is:
Step 1, upper connecting rod (1), lower link (6) to be connected with sample (4);
Step 2, plate (15) of extending are connected with sample (4) by upper lower chuck;
Step 3, thermopair is bundled on sample;
Step 4, slowly put down heating furnace (2), by the good test parameters of computer installation, heating furnace starts heating;
Step 5, gas mixer chamber (23) to be 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, completes the connection of corrosive gas circulation passage;
Step 6, heating furnace open blower fan valve (35), vacuum pump valve (33) while heating up, and keep air intake valve (30), neutralization pond valve (36) to close; Open vacuum pump (34) pipe interior is vacuumized;
Step 7, after managing interior formation vacuum, close vacuum pump and vacuum pump valve, open air intake valve, pass into corrosive gas, be full of after pipeline until corrosive gas, open blower fan (29), close air intake valve, realize etchant gas circulation;
Step 8, treat that temperature conditions meets requirement of experiment, start to load, test formally starts;
Step 9, experimental stage, gas flow gets back to gas mixer chamber (23) after gas mixer chamber (23), primary heater (22), lower link (6), sample (4), upper connecting rod (1), refrigeratory (28), blower fan (29), forms closed circuit; The circulation realizing gas in closed circuit can reduce the use amount of corrosive gas; Gas carries out preheating in primary heater (22), can reduce the impact of the temperature difference on sample; It is inner that the quartz ampoule (18) of gas flow after preheating in lower link (6) enters sample (4), corrodes at sample inside surface, realizes the acting in conjunction of corrosion and high-temerature creep; The blower fan that native system uses is corrosion resistant fan; The effect of refrigeratory reduces blower fan working temperature, extends service life of fan;
Step 10, experiment ending phase, open air intake valve and the neutralization pond valve (36) of nitrogen cylinder (24), close blower fan valve (35) and blower fan (29), in system, pass into nitrogen, intrasystem corrosive gas is entered neutralization pond (31); After etchant gas drains, close all valves, and stop creep test; In order to prevent sample fracture etchant gas from bleeding in environment, before sample generation creep rupture, stop test.
2. a kind of material test system realizing gas attack and creep under high temperature according to claim 1, 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) are connected to form closed circuit successively.
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