A P91 material high temperature creep performance testing device and testing method

Abstract

The invention relates to the technical field of creep performance testing devices, and in particular to a high-temperature creep performance testing device and a testing method for a P91 material; a high-temperature creep performance testing device for a P91 material of the invention comprises: a frame, a temperature control mechanism and a mounting seat; the mounting seat is rotatably connected to the frame; fixing grooves are provided at both ends of the mounting seat; a fixing rod is slidably connected to the frame; the fixing rod on the frame is arranged in a cross shape; a counterweight mechanism is arranged on the frame; the counterweight mechanism is connected to the clamping seat through a connecting rod; the invention rotatably connects the mounting seat to the frame, and changes the direction of the mounting seat, so that the clamping seat slidably connected to the mounting seat is in different positions, thereby applying force to a thinning tube in different directions, so that the thinning tube is subjected to axial tension, pressure and lateral tension respectively, and can perform tensile creep test, compression creep test and bending creep test respectively.

Description

Technical Field

[0001] The present invention relates to the technical field of creep performance testing devices, and in particular to a high-temperature creep performance testing device and a testing method for a P91 material. Background Art

[0002] P91 material is a martensitic heat-resistant steel with excellent performance. It exhibits many excellent properties under high temperature environment. P91 material has excellent high temperature strength, can work stably under high temperature and high pressure, and has good oxidation resistance, which can effectively resist high temperature oxidation corrosion. It has high thermal conductivity and low thermal expansion coefficient, which is conducive to alleviating the influence of thermal stress, and has outstanding creep resistance. It has small deformation under long-term high temperature stress. Therefore, P91 material is often used in high temperature and high pressure pipelines in power, petrochemical and other industries, such as main steam pipelines, superheater and reheater pipelines in thermal power plants;

[0003] The high-temperature creep performance test methods of metal materials are divided into high-temperature tensile creep test, high-temperature compression creep test and high-temperature bending creep test. When the pipe made of P91 material is tested for high-temperature creep performance, a metal material high-temperature creep endurance performance tester is required;

[0004] However, the existing high-temperature creep endurance performance testing machines for metal materials have a single function and can only perform a single high-temperature creep test on pipes made of P91 material. For example, one device can only perform a high-temperature tensile creep test, so a separate device is required for each test, which causes limitations.

[0005] Therefore, we propose a high temperature creep performance testing device and method for P91 material. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a P91 material high temperature creep performance testing device and testing method, which overcomes the deficiencies in the prior art and aims to solve the problems in the background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: a P91 material high temperature creep performance testing device, comprising:

[0008] A frame, a temperature control mechanism, a measuring mechanism, an isolation cover and a mounting seat; the mounting seat is rotatably connected to the frame; the two ends of the mounting seat are respectively fixedly and slidably connected with a clamping seat, and the two ends of the mounting seat are provided with a fixing groove; a fixing rod is slidably connected to the frame; the fixing rod on the frame is arranged in a cross shape; a counterweight mechanism is arranged on the frame; the counterweight mechanism is connected to the clamping seat through a connecting rod.

[0009] Preferably, a telescopic groove and an arc groove are formed at one end of the mounting seat; the arc groove is connected to the middle part of the telescopic groove; and the clamping seat is slidably connected in the telescopic groove.

[0010] By rotating the mounting seat connected to the frame and changing the direction of the mounting seat, the clamping seat slidably connected to the mounting seat is placed in different positions, thereby applying force to the thinned tube in different directions, so that the thinned tube is subjected to axial tension, pressure and lateral tension respectively, and tensile creep test, compression creep test and bending creep test can be carried out respectively.

[0011] Preferably, an open groove is provided on the clamping seat; a connecting block is slidably connected in the open groove; the connecting block is in an I-shape, an adjusting screw is threadedly connected to the clamping seat; and an extrusion block is rotatably connected to the end of the adjusting screw.

[0012] Preferably, the upper end of the connecting rod is slidably connected to an L-shaped block; the L-shaped block is rotatably connected to the connecting block; and the connecting rod is fixed to the L-shaped block by bolts.

[0013] Preferably, the connecting rod is a sleeve rod.

[0014] Preferably, a spiral groove is provided on the clamping seat.

[0015] A method for testing the high temperature creep performance of a P91 material, which is applicable to the above-mentioned device for testing the high temperature creep performance of a P91 material, and the steps of the method are as follows:

[0016] S1. Clamp the two ends of the thinned tube on the clamping seats at the upper and lower ends of the mounting seat. The temperature control mechanism heats the thinned tube. At the same time, the counterweight mechanism applies force to the clamping seat below through the connecting rod, thereby applying tension to the thinned tube. The measuring mechanism measures the moving distance of the positioning section on the thinned tube, and performs a tensile creep test on the thinned tube.

[0017] S2, pull the fixing rod out of the fixing groove, rotate the mounting seat 180 degrees, and then insert the fixing rod into the fixing groove, so that the clamping seat slidably connected to the mounting seat is located at the top, clamping the thinned tube, and the clamping seat compresses the thinned tube downward, and cooperates with the temperature control mechanism, the configuration mechanism and the measuring mechanism to perform a compression creep test on the thinned tube;

[0018] S3. Rotate the mounting seat 90 degrees so that the mounting seat is set horizontally, and then slide the connecting rod on the L-shaped block to make the connecting rod vertical. When the connecting rod applies tension to the clamping seat, the clamping seat slides downward along the arc groove, thereby applying a downward force to one end of the thinned tube, stretching the thinned tube from one side, and performing a bending creep test on the thinned tube.

[0019] Beneficial effects of the present invention:

[0020] 1. The present invention rotatably connects the mounting seat to the frame and changes the direction of the mounting seat so that the clamping seat slidably connected to the mounting seat is in different positions, thereby applying force to the thinned tube in different directions, so that the thinned tube is subjected to axial tension, pressure and lateral tension respectively, and can perform tensile creep test, compression creep test and bending creep test respectively.

[0021] 2. The present invention adjusts the position of the connecting block so that the position where the connecting rod applies the pulling force is located at the positioning section of the thinning tube. Therefore, the force arm of the thinning tube when bending is just at the position of the positioning section. When the thinning tube is bent, there will be no deviation in the length of the force arm, thereby affecting the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0024] Figure 3 for Figure 1 The enlarged view of point B in the middle;

[0025] Figure 4 for Figure 2 A cross-sectional view of the clamping seat, the connecting block and the L-shaped block at the cross-sectional view at CC;

[0026] Figure 5 It is a schematic diagram of the structure when the mounting seat, the clamping seat and the L-shaped rod are arranged horizontally in the present invention;

[0027] Figure 6 It is a partial cross-sectional view of the clamping seat, the connecting block and the extrusion block in the present invention;

[0028] Figure 7 It is a schematic diagram of the structure of the thinned tube in the present invention.

[0029] In the figure: 1, frame; 2, temperature control mechanism; 3, measuring mechanism; 4, mounting seat; 41, clamping seat; 42, fixing groove; 43, fixing rod; 5, counterweight mechanism; 51, connecting rod; 6, telescopic groove; 61, arc groove; 62, opening groove; 63, connecting block; 64, adjusting screw; 65, extrusion block; 66, L-shaped block; 67, spiral groove. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Embodiment 1: Refer to the attached specification Figure 1 , 2 , 3, 4, 5 and 6, a P91 material high temperature creep performance testing device, comprising:

[0032] A frame 1, a temperature control mechanism 2, a measuring mechanism 3, an isolation cover and a mounting seat 4; the mounting seat 4 is rotatably connected to the frame 1; both ends of the mounting seat 4 are respectively fixedly and slidably connected with a clamping seat 41, and both ends of the mounting seat 4 are provided with a fixing groove 42; a fixing rod 43 is slidably connected to the frame 1; the fixing rod 43 on the frame 1 is arranged in a cross shape; a counterweight mechanism 5 is arranged on the frame 1; the counterweight mechanism 5 is connected to the clamping seat 41 through a connecting rod 51.

[0033] In the present invention, a telescopic slot 6 and an arcuate slot 61 are formed at one end of the mounting seat 4 ; the arcuate slot 61 is connected to the middle of the telescopic slot 6 ; and the clamping seat 41 is slidably connected in the telescopic slot 6 .

[0034] According to the national standard GB / T2039-2012 "Uniaxial Tensile Creep Test Method for Metallic Materials", the original cross-sectional area of ​​the specimen should be greater than 7mm 2 , that is, the diameter of the specimen is greater than 3mm, and the two sides of the extensometer clamping boss are 2.5mm each, that is, the diameter of the specimen is greater than 8mm. When processing the specimen, a certain processing allowance is required on both sides, calculated as 1mm on both sides, that is, the diameter of the specimen needs to be greater than 10mm;

[0035] The specimen form recommended by the national standard is a rod-shaped specimen. If the wall thickness of the pipe is less than 10 mm, it is impossible to take out a rod with a diameter of 10 mm from the pipe wall, and it is also impossible to process a specimen that meets the national standard requirements.

[0036] In this embodiment, a nuclear power steam generator heat transfer tube with an outer diameter of 19 mm and a wall thickness of 3 mm is used for high temperature creep test. The original tube of 123 mm in length is selected, and the middle 60 mm portion is processed into a thinned tubular sample with a wall thickness of 1.5 mm as the middle section to ensure that the effective deformation area is located in this portion. Positioning sections with a height of 1.5 mm are reserved on both sides of the middle section for guiding

[0037] The clamping and measuring mechanism 3 of the extensometer is used for measurement;

[0038] In the present invention, a hatch is provided on the isolation cover. After opening the hatch, the two ends of the thinned tube are clamped on the clamping seats 41 at the upper and lower ends of the mounting seat 4. After the preparation work is completed, the hatch is closed, and the temperature control mechanism 2 heats the thinned tube. At the same time, the counterweight mechanism 5 applies force to the clamping seat 41 below through the connecting rod 51, so that the clamping seat 41 pulls the lower end of the thinned tube downward, thereby applying tension to the thinned tube. The measuring mechanism 3 measures the distance moved by the positioning section on the thinned tube, and performs a tensile creep test on the thinned tube.

[0039] In the present invention, the fixing rod 43 is pulled out from the fixing groove 42, and the mounting seat 41 is rotated 80 degrees, and then the fixing rod 43 is inserted into the fixing groove 42, so that the clamping seat 41 slidably connected to the mounting seat 4 is located at the top, and then the thinned tube is clamped. Therefore, when the connecting rod 51 applies force to the clamping seat 41, the clamping seat 41 compresses the thinned tube downward, and cooperates with the temperature control mechanism 2, the configuration mechanism and the measuring mechanism 3 to perform a compression creep test on the thinned tube;

[0040] In the present invention, the mounting seat 4 is rotated 90 degrees so that the mounting seat 4 is arranged horizontally. Therefore, after the thinned tube is installed on the clamping seat 41, it is also horizontal. Therefore, when the connecting rod 51 applies a pulling force to the clamping seat 41, the clamping seat 41 slides downward along the arc groove 61, thereby applying a downward force to one end of the thinned tube, stretching the thinned tube from one side, and performing a bending creep test on the thinned tube;

[0041] The present invention rotates the mounting seat 4 to be connected to the frame 1, and changes the direction of the mounting seat 4 so that the clamping seat 41 slidably connected to the mounting seat 4 is in different positions, thereby applying force to the thinned tube in different directions, so that the thinned tube is subjected to axial tension, pressure and lateral tension respectively, and can perform tensile creep test, compression creep test and bending creep test respectively.

[0042] Embodiment 2: Based on Embodiment 1, in the present invention, an open groove 62 is provided on the clamping seat 41; a connecting block 63 is slidably connected in the open groove 62; the connecting block 63 is in the shape of an I-beam, and an adjusting screw 64 is threadedly connected to the clamping seat 41; the end of the adjusting screw 64 is rotatably connected to an extrusion block 65.

[0043] In the present invention, the upper end of the connecting rod 51 is slidably connected with an L-shaped block 66; the L-shaped block 66 is rotatably connected to the connecting block 63; and the connecting rod 51 is fixed to the L-shaped block 66 by bolts.

[0044] In the present invention, the connecting rod 51 is a sleeve rod.

[0045] In the present invention, a spiral groove 67 is provided on the clamping seat 41 .

[0046] In the present invention, the staff loosens the adjusting screw 64, and then moves the connecting block 63, so that the connecting block 63 moves along the length direction of the mounting seat 4 with the connecting rod 51, until the connecting rod 51 moves to the position of the positioning section on the thinning tube, and then tightens the adjusting screw 64 to fix the connecting block 63. Therefore, when the thinning tube is subjected to a bending creep test, the position where the connecting rod 51 applies tension is located at the positioning section of the thinning tube. Therefore, the force arm of the thinning tube when bending is just at the position of the positioning section, and there will be no deviation in the length of the force arm when the thinning tube is bent, thereby affecting the test result.

[0047] In the present invention, the connecting rod 51 is connected to the connecting block 63 through the L-shaped block 66. When the mounting seat is rotated 490 degrees, the connecting rod 51 is slid on the L-shaped block 66, so that during the rotation of the mounting seat 4, the connecting rod 51 is tilted as the clamping seat 41 moves and returns to a vertical state. Therefore, when the connecting rod 51 pulls the clamping seat 41, the connecting rod 51 will not tilt, and thus will not affect the test results.

[0048] In the present invention, the connecting rod 51 is configured as a sleeve rod, which can slide and retract its length, so it can be adjusted after the mounting seat 4 is rotated. At the same time, a spiral groove 67 is provided on the clamping seat 41, which cooperates with the threads provided at both ends of the thinning tube, so that the clamping seat 41 can clamp more tightly.

[0049] Embodiment 3: A method for testing the high temperature creep performance of a P91 material. The method is applicable to the above-mentioned device for testing the high temperature creep performance of a P91 material. The steps of the method are as follows:

[0050] S1. Clamp the two ends of the thinned tube on the clamping seats 41 at the upper and lower ends of the mounting seat 4. The temperature control mechanism 2 heats the thinned tube. At the same time, the counterweight mechanism 5 applies force to the clamping seat 41 below through the connecting rod 51, thereby applying tension to the thinned tube. The measuring mechanism 3 measures the distance moved by the positioning section on the thinned tube, and performs a tensile creep test on the thinned tube.

[0051] S2, pull the fixing rod 43 out of the fixing groove 42, rotate the mounting seat 4180 degrees, and then insert the fixing rod 43 into the fixing groove 42, so that the clamping seat 41 slidably connected to the mounting seat 4 is located at the top, clamping the thinned tube, and the clamping seat 41 compresses the thinned tube downward, and cooperates with the temperature control mechanism 2, the configuration mechanism and the measuring mechanism 3 to perform a compression creep test on the thinned tube;

[0052] S3. Rotate the mounting seat 4 90 degrees so that the mounting seat 4 is set horizontally, and then slide the connecting rod 51 on the L-shaped block 66 to make the connecting rod 51 vertical. When the connecting rod 51 applies a pulling force to the clamping seat 41, the clamping seat 41 slides downward along the arc groove 61, thereby applying a downward force to one end of the thinned tube, stretching the thinned tube from one side, and performing a bending creep test on the thinned tube.

[0053] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected; the scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. A method for testing the high temperature creep performance of a P91 material, which is applicable to a device for testing the high temperature creep performance of a P91 material, and is characterized by: The steps of this method are as follows S1, clamping the two ends of the thinned tube on the clamping seats (41) at the upper and lower ends of the mounting seat (4), the temperature control mechanism (2) heats the thinned tube, and at the same time, the counterweight mechanism (5) applies a force to the lower clamping seat (41) through the connecting rod (51), thereby applying a tensile force to the thinned tube, and the measuring mechanism (3) measures the distance moved by the positioning section on the thinned tube, and performs a tensile creep test on the thinned tube; S2, the fixing rod (43) is pulled out from the fixing groove (42), the mounting seat (4) is rotated 180 degrees, and the fixing rod (43) is then inserted into the fixing groove (42), so that the clamping seat (41) slidably connected to the mounting seat (4) is located at the top, clamping the thinned tube, and the clamping seat (41) compresses the thinned tube downward, and cooperates with the temperature control mechanism (2), the configuration mechanism and the measuring mechanism (3) to perform a compression creep test on the thinned tube; S3, rotating the mounting seat (4) by 90 degrees so that the mounting seat (4) is arranged horizontally, and then sliding the connecting rod (51) on the L-shaped block (66) so that the connecting rod (51) is vertical, and when the connecting rod (51) applies a tensile force to the clamping seat (41), the clamping seat (41) slides downward along the arc groove (61), thereby applying a downward force to one end of the thinned tube, stretching the thinned tube from one side, and performing a bending creep test on the thinned tube; A P91 material high temperature creep performance testing device, comprising: A frame (1), a temperature control mechanism (2), a measuring mechanism (3), an isolation cover and a mounting seat (4); the mounting seat (4) is rotatably connected to the frame (1); two ends of the mounting seat (4) are respectively fixedly connected and slidably connected to a clamping seat (41), and two ends of the mounting seat (4) are provided with fixing grooves (42); a fixing rod (43) is slidably connected to the frame (1); the fixing rod (43) on the frame (1) is arranged in a cross shape; a counterweight mechanism (5) is arranged on the frame (1); the counterweight mechanism (5) is connected to the clamping seat (41) via a connecting rod (51); A telescopic groove (6) and an arc-shaped groove (61) are formed at one end of the mounting seat (4); the arc-shaped groove (61) is connected to the middle of the telescopic groove (6); and the clamping seat (41) is slidably connected in the telescopic groove (6); The clamping seat (41) is provided with an open groove (62); a connecting block (63) is slidably connected in the open groove (62); the connecting block (63) is in an I-shape; an adjusting screw (64) is threadedly connected to the clamping seat (41); and an extrusion block (65) is rotatably connected to the end of the adjusting screw (64); The upper end of the connecting rod (51) is slidably connected to an L-shaped block (66); the L-shaped block (66) is rotatably connected to the connecting block (63); the connecting rod (51) is fixed to the L-shaped block (66) by means of bolts; The connecting rod (51) is a sleeve rod; The clamping seat (41) is provided with a spiral groove (67).

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