CN102998250B - Experiment device for axial loading high-temperature stress corrosion test of metal material - Google Patents
Experiment device for axial loading high-temperature stress corrosion test of metal material Download PDFInfo
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- CN102998250B CN102998250B CN201210476103.6A CN201210476103A CN102998250B CN 102998250 B CN102998250 B CN 102998250B CN 201210476103 A CN201210476103 A CN 201210476103A CN 102998250 B CN102998250 B CN 102998250B
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Abstract
The invention discloses an experiment device for an axial loading high-temperature stress corrosion test of a metal material. The experiment device comprises a medium bottle, two rubber seal cones, two gaskets, an upper thread port cover, a lower thread port cover, a rubber seal plug, a U-shaped heating tube, a reflux condensing tube, a resistance wire, a temperature control system, a ceramic tube, binding posts with control switches, and wires, wherein the gaskets are arranged on the connections of the thread port covers and thread ports, a lower drip mouth is adopted as circular reflux condenser, and the opening part of the U-shaped heating tube penetrating through the inner part of the medium bottle is arranged outside the bottle. The experiment device has the advantages of completely avoiding the problems of leakage/leaking of a corrosive medium in the process of the axial loading high-temperature stress corrosion test, constantly maintaining the requirements of concentration and temperature of the medium, preventing the medium from spattering when replenishing volatilized water is replenished, preventing the test from being improperly stopped, ensuring the safety and accuracy of the test, increasing the test efficiency and being good in using effect.
Description
Technical field
The present invention relates to a kind of metallic material corrosion Test And Check Technology, particularly a kind of environmental device axially loading high temperature stress corrosion test for metal material.
Background technology
Metal material, under tension and specific media environment double action, has the possibility that delayed fracture and fracture occur voluntarily.The low stress corrosion brittle failure that it produces, has unpredictable character, usually causes the generation of accident and the loss of lot of materials, bring great potential safety hazard and property loss to engineer applied.For this reason, the stress corrosion crack problem of metal material is the key areas of material antiseptic and safe and reliable Journal of Sex Research, and stress corrosion (cracking) test is the important foundation of stress corrosion research, and the accuracy of its result directly affects the whether reliable of engineering.
At present, the metal material stress corrosion (cracking) test carried out both at home and abroad, mainly metal material processing is become specific sample (as tensile sample, C type sample, bend specimen etc.), be placed in specific simulated environment medium (as seawater, fluidizing chlorination magnesium solution, water vapour), and by charger, sample imposed load (constant stress, constant strain and slow strain rate) tested.Relevant standard mainly contains GB15970 series, ASTM G49 and YB5362.For charger, mainly purchase the lasting machine of ready-made dead load or slow strain rate test machine from the market at present; For environmental device, each unit carries out designed, designed according to the test objective of oneself.In standard, design for environmental device only gives rough schematic, do not further illustrate how to design and could prevent seepage/leakages of corrosive medium in test (the stress corrosion (cracking) test general time is all long) process, keep the constant of medium temperature and concentration, and these securities no matter collateral security is tested or accuracy all extremely important.For normal temperature or the low temperature stress corrosion design with media environment device, the problems referred to above are also easier to avoid, because 1. the problem of seepage can be carried out encapsulation process by silicon rubber to sample and environmental device binding site and solved; 2. when low temperature is tested, resistance wire operating interval is large, long service life, joins the temperature control system that a set of precision is higher, just the requirement of energy warranty test temperature; 3. the water in medium volatilizees comparatively slow in low temperature environment, in media environment device, regularly supplements the water of volatilization to initial metal line (generally once a day), just can the concentration of control medium effectively.And for the design of the environmental device for high temperature stress corrosion test, the particularly design of the used axial loading stress corrosion environmental device worn up and down, the problems referred to above make testing crew have a headache always.This is because: (1) leakage problems: silicon rubber or other glue sealing effectiveness in hot environment weaken, and often occur seepage/leakage phenomenon, cause testing equipment to corrode, and process of the test is also very dangerous.(2) temperature constant problem: resistance wire only works long hours even continuous working (as the stress corrosion (cracking) test of fluidizing chlorination magnesium), guarantee high-temperature medium temperature constant, therefore be easy to burn out, as do not changed in time or keep in repair, will cause testing non-normal termination; (3) constant concentration and medium spattering problem: the water in medium volatilizees comparatively fast when high temperature, automatically and continuously toward supplementing water in medium, wayward magnitude of recruitment and the balance of waving method amount on the one hand, concentration is difficult to keep constant; Also easily occur that water at low temperature adds the phenomenon of the medium splashing that high-temperature medium causes on the other hand, process of the test is very dangerous.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of environmental device axially loading high temperature stress corrosion test for metal material, high-temperature medium seepage/leakage problem can not only be avoided completely, constant maintenance concentration of medium and medium will be caused to splash when supplementary volatilization water, and facilitate in process of the test the replacing and maintenance that are burned resistance wire simultaneously, ensure medium temperature requirement exactly, avoid the non-normal termination tested.
In order to realize the object solved the problems of the technologies described above, present invention employs following technical scheme:
A kind of environmental device axially loading high temperature stress corrosion test for metal material of the present invention, comprises medium bottle, two rubber seal cones, two packing rings, upper screw thread lid, lower screw thread lid, rubber seal plug, U-shaped heating tube, reflux condensing tube, resistance wire, temperature control systems; Temperature control system comprises controller, thermometer or thermopair;
Medium bottle has screw thread mouth, lower screw thread mouth, thermometer mouth, reflux condenser mouth and sample, upper and lower screw thread mouth symmetry be distributed in medium bottle on to go to the bottom the both sides being distributed in screw thread mouth of central authorities, thermometer mouth and reflux condensation mode mouth of pipe symmetry; The upper screw thread mouth of medium bottle, lower screw thread mouth, thermometer mouth and reflux condenser mouth internal diameter are designed to taper, and the vertex of a cone is in bottle, and the cone end is at bottleneck; Upper screw thread mouth, the lower screw thread mouth internal diameter of medium bottle are consistent with rubber seal extrapyramidal shape, and external diameter is consistent with upper screw thread lid and lower screw thread lid screw thread; Thermometer mouth internal diameter is consistent with rubber seal plug outer diameter shape; Reflux condensation mode mouth of pipe internal diameter is consistent with reflux condensing tube external diameter and through ground process;
Sample is through the upper and lower screw thread mouth of medium bottle, two rubber seal cone microcephaly relative symmetry to be through on sample and to be fixed on the upper and lower screw thread mouth of medium bottle, place a packing ring two rubber seal cones successively, and upper and lower screw thread lid is screwed on the upper and lower screw thread mouth of medium bottle; In the process of tightening, because packing ring can tightly withstand rubber seal cone, thus ensure that rubber seal cone and upper and lower screw thread mouth and coordinating closely between sample with rubber seal cone, prevent high temperature corrosion media leaks/leakage from leaking;
Thermometer through rubber seal plug, inserts the thermometer mouth of medium bottle, solution in the lower end contact medium bottle of thermometer, to be monitored and control by controller to medium temperature; Be inserted on the reflux condensation mode mouth of pipe of medium bottle after reflux condensing tube and running water pipe connect; The inside of medium bottle is furnished with U-shaped heating tube, and its uncovered position is outside bottle, and resistance wire is through the inner and two of U-shaped heating tube and is exposed at outside bottle and is connected with power supply lead wire.Can facilitate like this in process of the test to change at any time or keep in repair and burn out resistance wire.
Be that in the solution of droplet-like instillation medium bottle, cause the splashing of high temperature corrosion medium, the structure of reflux condenser can be: condenser water jacket length is no less than 250mm for preventing the water under reflux condenser condensation; The lower drip of reflux condenser is circular, ground length and condenser connector height completely the same.Can ensure that the water supplemented drops down in dielectric wall along bottle wall like this, prevent the water supplemented from being droplet-like, cause the splashing of high temperature corrosion medium; Ensure condensation effect simultaneously.
The environmental device axially loading high temperature stress corrosion test for metal material of the present invention, its preferred technology technical scheme is: medium bottle, U-shaped heating tube high temp glass system; Packing ring, upper screw thread lid, lower screw thread lid teflon system; Rubber seal cone and rubber seal plug fluororubber system.Can ensure that environmental device is high temperature resistant, anticorrosion like this.
The environmental device axially loading high temperature stress corrosion test for metal material of the present invention, for ensureing the convenience that environmental device uses, its technical scheme improved also can be: the electric wire be connected with resistance wire is by being with the binding post of gauge tap to be connected with power supply.Facilitate like this in process of the test and whether the replacing of resistance wire and maintenance or control medium are heated.
The environmental device axially loading high temperature stress corrosion test for metal material of the present invention, thermometer or thermopair selection principle are: boiling temperature medium thermometer, non-boiling temperature medium thermopair.
A kind of environmental device axially loading high temperature stress corrosion test for metal material, for ensureing the security that environmental device uses better, prevent exposed resistance wire to ignite other article or calcination operator, its technical scheme improved further also can be: exposed on heating tube external resistance silk braid ceramic pipe.
These technical schemes, also can combine mutually or combine, thus reach better technique effect.
By adopting technique scheme, the present invention has following beneficial effect:
The invention axially loading the environmental device of high temperature stress corrosion test for metal material of the present invention, not only completely avoid the seepage/leakage problem axially loading corrosive medium in high temperature stress corrosion test process, and constantly maintain concentration of medium, temperature requirement, prevent when supplementing volatilization water and cause medium to splash.Avoid the non-normal termination of test, ensure that security and the accuracy of test.
The technical scheme of solution high temperature corrosion media leaks/leakage problem provided by the invention, not only loads and unloads sample convenient, and owing to not using fluid sealant, avoids the process waiting for glue drying, improve test efficiency.The program is applied in axial normal temperature stress corrosion and corrosion fatigue test, and result of use is also better, and it also extends in the design of other homologous series environmental devices.
Technique effect is not only embodied in the convenience of the security of axial loading stress corrosion test itself, accuracy and operation, is also embodied in its partial design thinking applying in other isonomic environmental devices designs.
Accompanying drawing explanation
Fig. 1 is the structural representation of reflux condenser.
Fig. 2 is a kind of environmental device schematic diagram axially loading high temperature stress corrosion test for metal material of invention.
In figure, 1, modified reflux condensing tube, 2, upper screw thread lid, 3, packing ring, 4, rubber seal cone, 5, sample, 6, condenser connector, 7, U-shaped heating tube, 8, medium bottle, 9 times screw thread lids, 10, lower screw thread mouth, 11, resistance wire, 12, thermometer connector, 13, upper screw thread mouth, 14 rubber seal plugs; 15, thermometer or thermopair, 16, the binding post of band gauge tap, 17, electric wire, 18, ceramic pipe, 19, plug, 20, lower drip.
Embodiment
Below in conjunction with accompanying drawing, further explanation is explained to this patent.But the protection domain of this patent is not limited to concrete embodiment.
As shown in Figure 2, a kind of installation procedure axially loading the environmental device of high temperature stress corrosion test for metal material of the present invention is: sample 5 to be tested is by upper screw thread mouth 13, lower screw thread mouth 10 is through medium bottle 8, and working position is inner in media slot, 2 flexible rubber cone bodies of rubber seal cone 4(circular specimen, the flat logical rubber cone body of plate tensile sample) microcephaly is inserted in sample holder position from the two ends interference of sample relatively respectively, adjust 2 rubber seal cone spacings, make it can just fill in upper, on lower screw thread mouth, packing ring 3 is passed successively from the upper end of sample, upper screw thread lid 2, tighten screw thread lid 2, the bottom of sample is through packing ring 3, lower screw thread lid 9, tighten lower screw thread lid 9.Sample two is separately fixed at the upper lower clamp of testing machine, the thermopair 15(wherein boiling temperature medium thermometer of thermometer or temperature regulating device, the thermopair of non-boiling temperature medium temperature regulating device) interference is through rubber seal plug 14 insert in the medium in medium bottle 8 by temperature regulating device connector 12, and modified reflux condensing tube 1 is connected on condenser connector 6.One end of resistance wire 11 U-shaped heating tube 7 from assay flask penetrates, the other end passes, note ensureing that resistance wire 11 is stretching at the crooked position silk of U-tube, reduce the thermal value of crooked position, exposed resistance wire 11 outside U-shaped heating tube overlaps ceramic pipe 18, be connected with the electric wire 17 that the binding post 16 of band gauge tap is drawn, plug 19 is inserted in supply socket.
Embodiment 1: boiling temperature medium solution stress corrosion (cracking) test
For the stress corrosion (cracking) test of corrugated stainless steel tubing fluidizing chlorination magnesium.Measure diameter (circular specimen) or the length and width (plate tensile sample) of sample working portion, calculate the sectional area of sample working portion and added load; Weigh the magnesium chloride of appropriate amount according to the size of medium bottle and put into medium bottle; According to accompanying drawing 2 signal and install describe in detail experiment environment apparatus and sample are arranged on loading tester; Slowly add a small amount of high purity water from condenser mouth, be advisable to flood magnesium chloride; Pressure binding post gauge tap, on " ON " position, starts to heat environmental device; Viewing test temperature in process, when temperature exceedes temperature required, slowly adds a small amount of high purity water from condenser mouth, so repeatedly repeatedly, until the temperature of fluidizing chlorination magnesium reaches extremely temperature required; Now, sample is loaded into preset value, on-test timing; In process of the test, if occur, resistance wire blows, then depress heated beam switch on " OFF " position, the resistance wire more renewed, ensure heating continuously of medium; Sample fracture or reach test Preset Time, test stops, record test period; Treat that medium temperature drops to about 70 DEG C, take off condenser and thermometer, sample and environmental device is unloaded from testing machine, pour out with magnesium chloride solution in tap water diluent media bottle, turn on upper and lower screw thread lid, from medium bottle, take out sample, scouring media bottle, rubber seal cone and rubber seal plug, wait for that next is tested.
Embodiment 2: non-boiling temperature medium solution stress corrosion (cracking) test
For high-strength steel bolt 80 DEG C of low concentration NaOH stress corrosion (cracking) test.Compared with embodiment 1, difference is: (1) before installing according to accompanying drawing 2, do not need the NaOH of weighing appropriate amount and put into medium bottle, but the NaOH solution preparing respective concentration is stand-by; (2), when installing by accompanying drawing 2, do not use 15 thermometers, but the thermopair of 15 temperature control systems; (3), after installing, what fall from condenser 12 is not high purity water, but the NaOH solution of the respective concentration prepared.(4) do not need repeatedly repeatedly slowly to add a small amount of high purity water until reach temperature required from condenser mouth.Other process and embodiment 1 are together.
Attention: it be medium temperature due to the stress corrosion of fluidizing chlorination magnesium is lean on control medium concentration to ensure that embodiment 1 and the operation of embodiment 2 distinguishs, i.e. the different principle of the boiling temperature of variable concentrations medium; Meanwhile, the preparation of test(ing) medium need adjust gradually by observing medium temperature.
Claims (6)
1. metal material axially loads an environmental device for high temperature stress corrosion test, it is characterized in that: comprise medium bottle, two rubber seal cones, two packing rings, upper screw thread lid, lower screw thread lid, rubber seal plug, U-shaped heating tube, reflux condensing tube, resistance wire, temperature control system and samples; Temperature control system comprises controller and thermometer or thermopair;
Medium bottle has screw thread mouth, lower screw thread mouth, thermometer mouth, the reflux condensation mode mouth of pipe, upper and lower screw thread mouth symmetry be distributed in medium bottle on to go to the bottom the both sides being distributed in screw thread mouth of central authorities, thermometer mouth and reflux condensation mode mouth of pipe symmetry; The upper screw thread mouth of medium bottle, lower screw thread mouth, thermometer mouth and reflux condensation mode mouth of pipe internal diameter are designed to taper, and the vertex of a cone is in medium bottle, and the cone end is at medium bottleneck; Upper screw thread mouth, the lower screw thread mouth internal diameter of medium bottle are consistent with rubber seal extrapyramidal shape, and external diameter is consistent with upper screw thread lid and lower screw thread lid screw thread; Thermometer mouth internal diameter is consistent with rubber seal plug outer diameter shape; Reflux condensation mode mouth of pipe internal diameter is consistent with reflux condensing tube external diameter and through ground process;
Sample is through the upper and lower screw thread mouth of medium bottle, two rubber seal cone microcephaly relative symmetry to be through on sample and to be fixed on the upper and lower screw thread mouth of medium bottle, place a packing ring at the top of two rubber seal cones successively, and upper and lower screw thread lid is screwed on the upper and lower screw thread mouth of medium bottle;
Thermometer or thermopair, through rubber seal plug, insert the thermometer mouth of medium bottle, solution in the lower end contact medium bottle of thermometer or thermopair, to be monitored and control by controller to medium temperature; Be inserted on the reflux condensation mode mouth of pipe of medium bottle after reflux condensing tube and running water pipe connect; The inside of medium bottle is furnished with U-shaped heating tube, and its uncovered position is outside medium bottle, and resistance wire is through the inner and two of U-shaped heating tube and is exposed at outside medium bottle and is connected with power supply lead wire.
2. metal material axially loads the environmental device of high temperature stress corrosion test according to claim 1, it is characterized in that: the structure of described reflux condensing tube is: reflux condensing tube water jacket length is no less than 250mm; The lower drip of reflux condensing tube is circular, ground length and reflux condensing tube open height completely the same.
3. metal material axially loads the environmental device of high temperature stress corrosion test according to claim 2, it is characterized in that: described medium bottle, U-shaped heating tube high temp glass system; Packing ring, upper screw thread lid, lower screw thread lid teflon system; Rubber seal cone and rubber seal plug fluororubber system.
4. metal material axially loads the environmental device of high temperature stress corrosion test according to claim 1, it is characterized in that: the electric wire be connected with resistance wire is by being with the binding post of gauge tap to be connected with power supply.
5. metal material axially loads the environmental device of high temperature stress corrosion test according to claim 1, it is characterized in that: described thermometer or thermopair selection principle are: the medium selection thermometer being operated in boiling temperature, be operated in the medium selection thermopair of non-boiling temperature.
6. metal material axially loads the environmental device of high temperature stress corrosion test according to claim 1, it is characterized in that: exposed on heating tube external resistance silk braid ceramic pipe.
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Cited By (1)
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