WO2021013116A1 - 一种金属管全管样高温高压水慢拉伸应力腐蚀试验系统 - Google Patents

一种金属管全管样高温高压水慢拉伸应力腐蚀试验系统 Download PDF

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Publication number
WO2021013116A1
WO2021013116A1 PCT/CN2020/102919 CN2020102919W WO2021013116A1 WO 2021013116 A1 WO2021013116 A1 WO 2021013116A1 CN 2020102919 W CN2020102919 W CN 2020102919W WO 2021013116 A1 WO2021013116 A1 WO 2021013116A1
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Prior art keywords
sample
autoclave
clamp
metal
temperature
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English (en)
French (fr)
Inventor
李江
唐丽英
周荣灿
詹英杰
龚兵
王庆武
徐安
李季
王博涵
侯淑芳
宁娜
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Xian Thermal Power Research Institute Co Ltd
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Xian Thermal Power Research Institute Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
    • G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
    • 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
    • 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
    • G01N3/18—Performing tests at high or low temperatures
    • 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
    • G01N3/56—Investigating resistance to wear or abrasion
    • 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
    • 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
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/0222—Temperature
    • G01N2203/0226—High temperature; Heating means
    • 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
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/023—Pressure
    • G01N2203/0232—High pressure

Definitions

  • the invention belongs to the field of metal material stress corrosion test research, and specifically relates to a metal pipe full-tube sample high-temperature high-pressure water slow-tension stress corrosion test system.
  • Metal thin-walled tube components have been widely used in the key components of the primary circuit of nuclear power, such as the heat transfer tube of the pressurized water reactor steam generator, and the stress corrosion cracking of the evaporator heat transfer tube in the high temperature and high pressure water environment has become its main failure Form, has now become an important issue facing the nuclear industry.
  • slow stretching is a commonly used and highly reliable test method. It uses a slow strain rate (10 -5 ⁇ 10 -8 s -1 ) to apply stress until the sample Fracture occurred.
  • the slow tensile method is used to evaluate the stress corrosion sensitivity of materials using standard samples (such as the rod-shaped and plate-shaped samples given in GB/T 15970 and ASTM G129), but due to the shape effect, the standard sample cannot reflect the thin metal
  • standard samples such as the rod-shaped and plate-shaped samples given in GB/T 15970 and ASTM G129
  • the current commonly used method is: split the thin-walled tube sample into the center, process it into a flat boat-shaped sample, and then design the relevant fixtures to carry out the stress in the high temperature and high pressure water Corrosion test (see Chinese invention patents: 201611028719.1 and 201320175058.0), but the sample of this method often fails to meet the requirements for neutrality, the sample size measurement and cross-sectional area cannot be accurately calculated, the test results will have large deviations, and the data will be scattered. .
  • the current stress corrosion test in high-temperature and high-pressure water usually places the sample directly in the autoclave, and the inside and outside of the heat transfer tube sample are tested in the same temperature, pressure and water chemical environment, often ignoring the actual Under service conditions, the service performance of the heat transfer tube is changed due to the different temperature, pressure, and water chemical parameters inside and outside the heat transfer tube.
  • existing studies have shown that the difference in temperature, pressure, and water chemical conditions inside and outside the heat transfer tube is often important for its stress corrosion performance. As a result, if the test is carried out in a single environment, the results will inevitably have certain errors, which limits the relatively accurate performance evaluation of the corresponding components.
  • the purpose of the present invention is to overcome the above shortcomings in the prior art, and to provide a full-tube sample high-temperature high-pressure water slow tensile stress corrosion test system.
  • a metal pipe full-tube sample high-temperature and high-pressure water slow-tension stress corrosion test system including an autoclave composed of an autoclave body and an autoclave cover, a sample inner cavity inlet pipe, a sample inner cavity outlet pipe, and an autoclave inlet pipe , The water outlet pipe of the autoclave, and the loading support frame, upper joint, upper clamp, metal full pipe sample, lower clamp and lower joint used to be set in the autoclave;
  • the upper clamp and the lower clamp are respectively installed on the upper and lower ends of the metal full tube sample.
  • the two ends of the upper joint are respectively connected with the upper clamp and the loading support frame.
  • One end of the lower joint is connected with the lower clamp, and the other end is connected with Slow tensile testing machine is connected; water injection holes are opened in both the upper clamp and the lower clamp, high temperature and high pressure water enters the inner side of the metal sample through the sample cavity connected with the lower clamp, and then passes the test connected with the upper clamp
  • the outlet pipe of the sample cavity flows out of the autoclave, forming a flow in the sealed cavity inside the metal pipe; the autoclave inlet pipe and the autoclave outlet pipe pass through the autoclave cover and communicate with the inside of the autoclave; the autoclave body and the autoclave cover
  • a sealed space is formed to provide a high-temperature and high-pressure water environment outside the entire metal pipe sample.
  • the entire system can perform slow tensile stress corrosion tests in high-temperature and high-pressure water
  • the upper clamp includes an inner plug head, a clamp body, a clamping ring and a nut
  • the inner plug head is installed in the metal full tube sample
  • the clamp body is placed outside the metal full tube sample
  • the inner plug head and the clamp body The water injection hole of the inner plug head and the water injection hole of the clamp body are respectively opened, and the two are connected.
  • the clamp body is sealed and connected with the outlet pipe of the sample cavity through a connection joint; the lower clamp has the same structure as the upper clamp, and it enters the sample cavity. Water pipe connection.
  • a further improvement of the present invention is that when the upper clamp is clamped, the clamping ring is pushed into the gap between the clamp body and the metal full tube sample by tightening the nut, so that the metal full tube sample is recessed and deformed to form a clamping;
  • the clamping method is the same as the upper clamp.
  • a further improvement of the present invention is that both the sample lumen water inlet pipe and the sample lumen water outlet pipe adopt a retractable spiral coil structure, and the maximum deformation is greater than the elongation of the metal full pipe sample due to slow stretching;
  • the sample inner cavity water inlet pipe and the sample inner cavity water outlet pipe are connected to a set of high temperature and high pressure circulating water system through a stop valve at one end outside the autoclave cover.
  • the autoclave inlet pipe and the autoclave outlet pipe are connected to the other through the stop valve.
  • One set of high temperature and high pressure circulating water system is connected, and two sets of high temperature and high pressure circulating water system can adjust temperature, pressure and water chemical parameters respectively.
  • a further improvement of the present invention is that the loading support frame is fixedly connected to the autoclave cover through the support rod, and is connected to the upper joint by fixing bolts.
  • the upper clamp is provided with a clamp shoulder, and the clamp shoulder is clamped on the U-shaped opening of the upper joint during installation. In the groove, the connection mode of the lower joint and the lower clamp is the same as that of the upper joint and the upper clamp.
  • a further improvement of the present invention is that the high temperature and high pressure water environment refers to the subcritical or supercritical water environment.
  • a further improvement of the present invention is that, in order to ensure the success rate of the test, the gauge length section of the metal full tube sample can be processed to reduce the wall thickness by mechanical processing.
  • the present invention has the following beneficial effects:
  • the upper clamp and the lower clamp are respectively installed on the upper and lower ends of the metal full tube sample, the two ends of the upper joint are respectively connected with the upper clamp and the loading support frame, one end of the lower joint is connected with the lower clamp, and the other end passes through the autoclave
  • the upper clamp and the lower clamp are equipped with water injection holes, high temperature and high pressure water enters the inner side of the metal full tube sample through the sample cavity connected with the lower clamp, and then passes through the upper clamp
  • the connected sample cavity outlet pipe flows out of the autoclave, forming a flow in the sealed cavity in the metal full tube sample;
  • the autoclave inlet pipe and the autoclave outlet pipe pass through the autoclave cover and communicate with the inside of the autoclave;
  • the autoclave body and The autoclave cover forms a sealed space to provide a high-temperature and high-pressure water environment outside the whole metal tube sample, thereby realizing the slow tensile stress corrosion performance test of the whole metal tube sample in
  • the present invention can form a flowing high-temperature and high-pressure water environment on both the inside and outside of the metal full tube sample, and can achieve high temperatures with different temperatures, pressures, and water chemical parameters (dissolved oxygen, conductivity, pH) inside and outside the metal full tube sample. Slow tensile stress corrosion test in high pressure water environment.
  • the invention is ingenious in design, simple and convenient to operate, low in price, can be installed on a common high temperature and high pressure water slow tensile testing machine in the laboratory, and has a wide range of applications.
  • Figure 1 is a general assembly drawing of the present invention.
  • Figure 2 is an assembly drawing of the upper clamp.
  • a layer/element when referred to as being “on” another layer/element, the layer/element may be directly on the other layer/element, or there may be an intermediate layer/element between them. element.
  • the layer/element may be located “under” the other layer/element when the orientation is reversed.
  • the present invention provides a metal pipe full-tube sample high temperature high pressure water slow tensile stress corrosion test system, including an autoclave body 1, a loading support frame 2, an upper joint 3, an upper clamp 4.
  • Metal full tube sample 5, lower clamp 6, lower joint 7, sample inner cavity inlet pipe 8, sample inner cavity outlet pipe 9, autoclave inlet pipe 10, autoclave outlet pipe 11, autoclave cover 12, and stop valve 13 Wherein the upper clamp 4 includes an inner plug 41, a clamp body 42, a clamping ring 43 and a nut 44.
  • the head water injection hole 411 is aligned and communicated with the water injection hole 421 of the fixture body. Tighten the nut 44 to push the clamping ring 43 into the gap between the fixture body 42 and the metal full tube sample 5, so that the metal tube is recessed and deformed to form a clamping ,
  • the lower clamp 6 has the same structure as the upper clamp 4, and the upper and lower clamps are respectively installed on the upper and lower ends of the metal full tube sample 5.
  • the autoclave body 1 is provided with a loading support frame 2.
  • the loading support frame 2 is fixedly connected to the autoclave cover 12 through a support rod 21, the loading support frame 2 is fixedly connected to the upper joint 3 by a fixing bolt 22, and the upper clamp 4 is provided with a clamp shaft
  • the shoulder 423 is installed so that the clamp shaft shoulder 423 is clamped in the U-shaped groove 31 of the upper joint 3, and the whole formed by the upper clamp 4, the metal full tube sample 5 and the lower clamp 6 is suspended on the upper joint 3.
  • the lower joint 7 is also provided with a U-shaped groove to adjust the relative position of the lower joint 7 and the lower clamp 6 so that the clamp shoulder of the lower clamp 6 is stuck in the U-shaped groove of the lower joint 7, and the other end of the lower joint 7 passes through the high pressure After the kettle cover 12, it is connected with a slow tensile testing machine.
  • sample inner cavity water outlet pipe 9 Connect one end of the sample inner cavity water outlet pipe 9 to the upper fixture body 42 through the connection joint 422 and threadedly connect the sample inner cavity water inlet pipe 8 to the lower fixture 6 in the same manner.
  • the high temperature and high pressure water passes through and the lower fixture 6
  • the connected sample inner cavity water inlet pipe 8 enters the inside of the metal full tube sample 5, and then flows out through the sample inner cavity water outlet pipe 9 connected to the upper clamp 4, forming a flow in the sealed cavity of the metal full tube sample 5
  • the other end of the sample inner cavity water inlet pipe 8 and the sample inner cavity water outlet pipe 9 passes through the autoclave cover 12 and is connected to a set of high temperature and high pressure circulating water system through a shut-off valve 13.
  • the autoclave is equipped with an autoclave inlet pipe 10 and an autoclave outlet pipe 11, and is connected to another set of high temperature and high pressure circulating water system through a shut-off valve 13.
  • the entire clamping system and samples are placed in the autoclave.
  • the autoclave body 1 and the autoclave cover 12 form a sealed space to provide a high temperature and high pressure water environment outside the metal full tube sample 5.
  • Two sets of high temperature and high pressure circulating water systems can adjust temperature, pressure and water chemical parameters (dissolved oxygen, conductivity, pH), which can realize the slow tensile stress corrosion test in the high temperature and high pressure water environment with different internal temperature, pressure, and water chemical parameters (dissolved oxygen, conductivity, pH) of the metal full tube sample 5.
  • the wall thickness of the 5 gauge section of the metal full pipe sample can be slightly reduced by mechanical processing to ensure that the slow tensile stress corrosion test will eventually break in the gauge section area.

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Abstract

一种金属管全管样高温高压水慢拉伸应力腐蚀试验系统，包括上下接头（3,7）、上下夹具（4,6）和金属全管样（5）等，上下夹具（4,6）分别安装在金属全管样（5）上下两端，通过内塞头（41）和外部夹紧环（43）夹紧试样；上下夹具（4,6）内均设置注水孔（421），高温高压水通过试样内腔入水管（8）进入金属全管样（5）内侧，再通过试样内腔出水管（9）流出，在金属全管样（5）内的密封腔内形成流动；整个夹持系统及试样置于高压釜内，高压釜提供金属全管样（5）外部的高温高压水环境。该试验系统设计巧妙，操作简单方便，可以安装于实验室常见的各种高温高压水慢拉伸试验机上，可实现金属管全管样在内外侧不同温度、压力、水化学参数（溶解氧、电导率、pH）的高温高压水环境中进行慢拉伸应力腐蚀试验。

Description

一种金属管全管样高温高压水慢拉伸应力腐蚀试验系统 【技术领域】
本发明属于金属材料应力腐蚀试验研究领域，具体涉及一种金属管全管样高温高压水慢拉伸应力腐蚀试验系统。
【背景技术】
金属薄壁管构件已经广泛应用于核电一回路的关键部件，如压水堆蒸汽发生器传热管，而蒸发器传热管在高温高压水环境中的应力腐蚀开裂已成为其最主要的失效形式，目前已经成为核工业界面临的重要问题。在研究材料应力腐蚀开裂敏感性时，慢拉伸是一种常用且可靠性高的试验方法，它通过缓慢的应变速率(10 -5～10 -8s -1)来施加应力，直至试样发生断裂。通常利用慢拉伸方法评价材料的应力腐蚀敏感性采用标准试样(如GB/T 15970、ASTM G129中给出的棒状、板状试样)，但由于形状效应，标准试样无法反应金属薄壁管的形状、尺寸因素对其应力腐蚀敏感性的影响，目前常用的方法为：将薄壁管试样对中剖开，加工成扁舟状试样，然后设计相关夹具进行高温高压水中的应力腐蚀试验(参见中国发明专利：201611028719.1和201320175058.0)，但是这种方法的试样对中性往往满足不了要求，试样尺寸测量和截面积无法精确计算，试验结果偏差会很大，数据分散性大。
除此之外，目前高温高压水中的应力腐蚀试验通常直接将试样置于高压釜内，传热管试样内侧与外侧在相同的温度、压力及水化学环境中进行试验，往往忽略了实际服役工况下传热管由于内外侧温度、压力、水化学参数不同而导致的服役性能变化，然而已有研究表明传热管内外侧温度、压力、水化学条件不同对其应 力腐蚀性能往往有着重要影响，在单一环境中进行试验，其结果必然会有一定误差，从而限制了相应构件进行比较准确的性能评估。
【发明内容】
本发明的目的是为了克服现有技术中的以上弊端，提供了一种金属管全管样高温高压水慢拉伸应力腐蚀试验系统。
本发明采用如下技术方案来实现的：
一种金属管全管样高温高压水慢拉伸应力腐蚀试验系统，包括由高压釜体和高压釜盖组成的高压釜，试样内腔入水管，试样内腔出水管，高压釜入水管，高压釜出水管，以及用于设置在高压釜内的加载支撑架、上接头、上夹具、金属全管样、下夹具和下接头；其中，
试验时，上夹具和下夹具分别安装在金属全管样上下两端，上接头两端分别与上夹具和加载支撑架连接，下接头一端与下夹具连接，另一端穿过高压釜盖后与慢拉伸试验机连接；上夹具和下夹具内均开设有注水孔，高温高压水通过与下夹具连接的试样内腔入水管进入金属全管样的内侧，再通过与上夹具连接的试样内腔出水管流出高压釜，在金属全管样内的密封腔内形成流动；高压釜入水管和高压釜出水管均穿过高压釜盖与高压釜内连通；高压釜体与高压釜盖形成密封空间提供金属全管样外部的高温高压水环境，整套系统能够实现金属全管样在内外侧不同温度、压力及水化学参数的高温高压水环境中进行慢拉伸应力腐蚀试验，其中水化学参数包括溶解氧、电导率和pH。
本发明进一步的改进在于，上夹具包括内塞头、夹具本体、夹紧环和螺母，内塞头安装在金属全管样内，夹具本体置于金属全管样外，内塞头和夹具本体分别开设有内塞头注水孔和夹具本体注水孔，且两者相连通，夹具本体通过连接接 头与试样内腔出水管密封连接；下夹具与上夹具结构相同，其与试样内腔入水管连接。
本发明进一步的改进在于，上夹具夹紧时通过拧紧螺母将夹紧环推入夹具本体与金属全管样之间的间隙，使得金属全管样向内凹陷变形，形成夹紧；下夹具的夹紧方式与上夹具相同。
本发明进一步的改进在于，试样内腔入水管和试样内腔出水管均采用可伸缩的螺旋盘管结构，且最大形变量大于金属全管样由于慢拉伸而导致的伸长量；试样内腔入水管和试样内腔出水管在高压釜盖外一端通过截止阀与一套高温高压循环水系统相连，与此同时，高压釜入水管和高压釜出水管通过截止阀与另外一套高温高压循环水系统相连，两套高温高压循环水系统能够分别调节温度、压力和水化学参数。
本发明进一步的改进在于，加载支撑架通过支撑杆与高压釜盖固定连接，与上接头通过固定螺栓连接，上夹具设有夹具轴肩，安装时使得夹具轴肩卡在上接头开设的U形槽内，下接头与下夹具连接方式与上接头与上夹具的连接方式相同。
本发明进一步的改进在于，高温高压水环境是指亚临界或者超临界水环境。
本发明进一步的改进在于，为保证试验的成功率，金属全管样标距段能够通过机械加工将壁厚减薄处理。
与现有技术相比，本发明具有以下有益效果：
1、本发明通过将上夹具和下夹具分别安装在金属全管样上下两端，上接头两端分别与上夹具和加载支撑架连接，下接头一端与下夹具连接，另一端穿过高压釜盖后与慢拉伸试验机连接；上夹具和下夹具内均开设有注水孔，高温高压水通过与下夹具连接的试样内腔入水管进入金属全管样的内侧，再通过与上夹具连 接的试样内腔出水管流出高压釜，在金属全管样内的密封腔内形成流动；高压釜入水管和高压釜出水管均穿过高压釜盖与高压釜内连通；高压釜体与高压釜盖形成密封空间提供金属全管样外部的高温高压水环境，进而可以实现金属管全管样在高温高压水环境中的慢拉伸应力腐蚀性能测试，克服了现有技术中扁舟状试样对中性差、试验结果分散性大等弊端。
2、本发明可在金属全管样内侧和外侧都形成流动的高温高压水环境，可实现金属全管样在内外侧不同温度、压力、水化学参数(溶解氧、电导率、pH)的高温高压水环境中进行慢拉伸应力腐蚀试验。
3、本发明设计巧妙，操作简单方便、价格低廉，可以安装于实验室常见高温高压水慢拉伸试验机上，应用广泛。
【附图说明】
图1为本发明的总装配图。
图2为上夹具的装配图。
附图标记说明：
1为高压釜体；2为加载支撑架；21为支撑杆；22为固定螺栓；3为上接头；31为U形槽；4为上夹具；5为金属全管样；6为下夹具；7为下接头；8为试样内腔入水管；9为试样内腔出水管；10为高压釜入水管；11为高压釜出水管；12为高压釜盖；13为截止阀；41为内塞头；411为内塞头注水孔；42为夹具本体；421夹具本体注水孔；422为连接接头；423夹具轴肩；43为夹紧环；44为螺母。
【具体实施方式】
为了使本技术领域的人员更好地理解本发明方案，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述 的实施例仅仅是本发明一部分的实施例，不是全部的实施例，而并非要限制本发明公开的范围。此外，在以下说明中，省略了对公知结构和技术的描述，以避免不必要的混淆本发明公开的概念。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都应当属于本发明保护的范围。
在附图中示出了根据本发明公开实施例的各种结构示意图。这些图并非是按比例绘制的，其中为了清楚表达的目的，放大了某些细节，并且可能省略了某些细节。图中所示出的各种区域、层的形状及它们之间的相对大小、位置关系仅是示例性的，实际中可能由于制造公差或技术限制而有所偏差，并且本领域技术人员根据实际所需可以另外设计具有不同形状、大小、相对位置的区域/层。
本发明公开的上下文中，当将一层/元件称作位于另一层/元件“上”时，该层/元件可以直接位于该另一层/元件上，或者它们之间可以存在居中层/元件。另外，如果在一种朝向中一层/元件位于另一层/元件“上”，那么当调转朝向时，该层/元件可以位于该另一层/元件“下”。
需要说明的是，本发明的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的本发明的实施例能够以除了在这里图示或描述的那些以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
下面结合附图对本发明做进一步详细描述：
如图1和图2所示，本发明提供的一种金属管全管样高温高压水慢拉伸应力腐蚀试验系统，包括高压釜体1、加载支撑架2、上接头3、上夹具4、金属全管样5、下夹具6、下接头7、试样内腔入水管8、试样内腔出水管9、高压釜入水管10、高压釜出水管11、高压釜盖12和截止阀13，其中，上夹具4包括内塞头41、夹具本体42、夹紧环43和螺母44。
试验时，本发明的具体安装步骤如下：
首先，将内塞头41塞于金属全管样5内，依次将螺母44、夹紧环43安装于金属全管样5上，然后将试样插入夹具本体42的凹槽内，使得内塞头注水孔411与夹具本体注水孔421对正且连通，拧紧螺母44将夹紧环43推入夹具本体42与金属全管样5之间的间隙，使得金属管向内凹陷变形，形成夹紧，下夹具6与上夹具4结构相同，且上下夹具分别安装在金属全管样5上下两端。
高压釜体1内设有加载支撑架2，加载支撑架2通过支撑杆21与高压釜盖12固定连接，加载支撑架2通过固定螺栓22与上接头3固定连接，上夹具4设有夹具轴肩423，安装时使得夹具轴肩423卡在上接头3的U形槽31内，将上夹具4、金属全管样5和下夹具6所形成的整体悬挂在上接头3上。下接头7上也设有U形槽，调节下接头7与下夹具6的相对位置，使得下夹具6的夹具轴肩卡在下接头7的U形槽内，下接头7的另一端穿过高压釜盖12后，与慢拉伸试验机相连。
将试样内腔出水管9的一端通过连接接头422与上夹具本体42螺纹密封连接，用相同的方式将试样内腔入水管8与下夹具6密封连接，高温高压水通过与下夹具6连接的试样内腔入水管8进入金属全管样5的内侧，再通过与所述上夹 具4连接的试样内腔出水管9流出，在金属全管样5内的密封腔内形成流动，试样内腔入水管8和试样内腔出水管9的另一端穿过高压釜盖12后通过截止阀13与一套高温高压循环水系统相连。
与此同时，高压釜设有高压釜入水管10、高压釜出水管11，且通过截止阀13与另外一套高温高压循环水系统相连，整个夹持系统及试样置于高压釜内，所述高压釜体1与高压釜盖12形成密封空间提供金属全管样5外部的高温高压水环境，两套高温高压循环水系统可分别调节温度、压力和水化学参数(溶解氧、电导率、pH)，可实现金属全管样5在内侧不同温度、压力、水化学参数(溶解氧、电导率、pH)的高温高压水环境中进行慢拉伸应力腐蚀试验。
为了保证试验的成功率，可将金属全管样5标距段通过机械加工方式将壁厚略减薄，保证慢拉伸应力腐蚀试验最终在标距段区域内断裂。
以上内容仅为说明本发明的技术思想，不能以此限定本发明的保护范围，凡是按照本发明提出的技术思想，在技术方案基础上所做的任何改动，均落入本发明权利要求书的保护范围之内。

Claims (7)

  1. 一种金属管全管样高温高压水慢拉伸应力腐蚀试验系统，其特征在于，包括由高压釜体(1)和高压釜盖(12)组成的高压釜，试样内腔入水管(8)，试样内腔出水管(9)，高压釜入水管(10)，高压釜出水管(11)，以及用于设置在高压釜内的加载支撑架(2)、上接头(3)、上夹具(4)、金属全管样(5)、下夹具(6)和下接头(7)；其中，
    试验时，上夹具(4)和下夹具(6)分别安装在金属全管样(5)上下两端，上接头(3)两端分别与上夹具(4)和加载支撑架(2)连接，下接头(7)一端与下夹具(6)连接，另一端穿过高压釜盖(12)后与慢拉伸试验机连接；上夹具(4)和下夹具(6)内均开设有注水孔，高温高压水通过与下夹具(6)连接的试样内腔入水管(8)进入金属全管样(5)的内侧，再通过与上夹具(4)连接的试样内腔出水管(9)流出高压釜，在金属全管样(5)内的密封腔内形成流动；高压釜入水管(10)和高压釜出水管(11)均穿过高压釜盖(12)与高压釜内连通；高压釜体(1)与高压釜盖(12)形成密封空间提供金属全管样(5)外部的高温高压水环境，整套系统能够实现金属全管样(5)在内外侧不同温度、压力及水化学参数的高温高压水环境中进行慢拉伸应力腐蚀试验，其中水化学参数包括溶解氧、电导率和pH。
  2. 根据权利要求1所述的一种金属管全管样高温高压水慢拉伸应力腐蚀试验系统，其特征在于，上夹具(4)包括内塞头(41)、夹具本体(42)、夹紧环(43)和螺母(44)，内塞头(41)安装在金属全管样(5)内，夹具本体(42)置于金属全管样(5)外，内塞头(41)和夹具本体(42)分别开设有内塞头注水孔(411)和夹具本体注水孔(421)，且两者相连通，夹具本体(42)通过连接接头(422)与试样内腔出水管(9)密封连接；下夹具(6)与上夹具(4)结 构相同，其与试样内腔入水管(8)连接。
  3. 根据权利要求2所述的一种金属管全管样高温高压水慢拉伸应力腐蚀试验系统，其特征在于，上夹具(4)夹紧时通过拧紧螺母(44)将夹紧环(43)推入夹具本体(42)与金属全管样(5)之间的间隙，使得金属全管样(5)向内凹陷变形，形成夹紧；下夹具(6)的夹紧方式与上夹具(4)相同。
  4. 根据权利要求1所述的一种金属管全管样高温高压水慢拉伸应力腐蚀试验系统，其特征在于，试样内腔入水管(8)和试样内腔出水管(9)均采用可伸缩的螺旋盘管结构，且最大形变量大于金属全管样(5)由于慢拉伸而导致的伸长量；试样内腔入水管(8)和试样内腔出水管(9)在高压釜盖(12)外一端通过截止阀(13)与一套高温高压循环水系统相连，与此同时，高压釜入水管(10)和高压釜出水管(11)通过截止阀(13)与另外一套高温高压循环水系统相连，两套高温高压循环水系统能够分别调节温度、压力和水化学参数。
  5. 根据权利要求1所述的一种金属管全管样高温高压水慢拉伸应力腐蚀试验系统，其特征在于，加载支撑架(2)通过支撑杆(21)与高压釜盖(12)固定连接，与上接头(3)通过固定螺栓(22)连接，上夹具(4)设有夹具轴肩(423)，安装时使得夹具轴肩(423)卡在上接头(3)开设的U形槽(31)内，下接头(7)与下夹具(6)连接方式与上接头(3)与上夹具(4)的连接方式相同。
  6. 根据权利要求1所述的一种金属管全管样高温高压水慢拉伸应力腐蚀试验系统，其特征在于，高温高压水环境是指亚临界或者超临界水环境。
  7. 根据权利要求1所述的一种金属管全管样高温高压水慢拉伸应力腐蚀试验系统，其特征在于，为保证试验的成功率，金属全管样(5)标距段能够通过机械加工将壁厚减薄处理。
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