CN-122016437-A - Inter-crystal corrosion U-shaped sample preparation device and method

CN122016437ACN 122016437 ACN122016437 ACN 122016437ACN-122016437-A

Abstract

The invention provides a device and a method for preparing an inter-crystal corrosion U-shaped sample. The die assembly is arranged below the pressure head and is matched with the pressure head above the pressure head to be used, the die assembly is positioned and fixed in the forming process of the U-shaped sample, the sample is bent into the U-shape, the accuracy of the shape and the size of the U-shape sample is ensured, a certain rebound allowance is reserved in the forming process of the sample by utilizing the special structure of the die assembly, and therefore, the parallelism of the two arms can be finally kept after rebound, and the accuracy of the shape of the U-shape sample is ensured. By utilizing the sample preparation device, the precision of sample processing is ensured, and the working efficiency is high.

Inventors

SHEN JIAN
GU LIQIANG
FANG KEWEI
GUAN BINGXIN
CHENG JIAN
KANG HAIBO
Yuan Gaolin
LU JIACHANG

Assignees

苏州热工研究院有限公司
中国广核电力股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260403

Claims (10)

1. An intergranular corrosion U-shaped sample preparation device, comprising: The pressure head is provided with an arc-shaped end head at one end; the power system is connected with the pressure head and controls the movement of the pressure head; The mould subassembly, set up in the pressure head below, the mould subassembly includes: a die base on which a first groove is provided; the first die body and the second die body are arranged in the first groove and are respectively connected with the die base through elastic connecting pieces; The first die body and the second die body are matched to form a U-shaped groove and a second groove, and the second groove extends from the bottom surface of the U-shaped groove to the bottom surface of the first groove; Under the pressure of the pressure head, one side, close to the top of the U-shaped groove, of the first die main body and one side, close to the bottom of the second groove, of the second die main body move oppositely.
2. The intergranular corrosion U-shaped sample preparation apparatus according to claim 1, wherein the bottom surface of the first recess is arc-shaped, and a gap is left between the bottoms of the first mold body and the second mold body and the first recess.
3. The intergranular corrosion U-shaped sample preparation apparatus according to claim 2, wherein a major arc groove is formed outwardly at a junction of a bottom surface of the first groove and both side surfaces of the first groove, bottoms of the first mold body and the second mold body are respectively provided with a convex structure of a corresponding shape, and the convex structure is embedded into the major arc groove to connect the mold base with the first mold body and the second mold body; Under the pressure of the pressure head, the first die main body and the second die main body rotate by taking the protruding structures on the first die main body and the second die main body as centers respectively, so that one side, close to the top of the U-shaped groove, of the first die main body and one side, close to the bottom of the second groove, of the second die main body move in opposite directions.
4. The intergranular corrosion U-shaped sample preparation apparatus according to claim 1, wherein the top surface of the mold main body is further provided with a positioning portion which is disposed along the longitudinal direction of the mold assembly, and the positioning portions are symmetrically disposed at both sides of the U-shaped groove, and the sample is disposed in the positioning portion.
5. The intergranular corrosion U-shaped sample preparation apparatus according to claim 4, wherein the positioning portion comprises: the positioning groove is formed on the top surface of the die main body; The sample pad is arranged in the positioning groove, the outer dimension of the sample pad is matched with the dimension of the positioning groove, the inner dimension of the sample pad is matched with the dimension of the sample, and the sample is clamped in the sample pad.
6. The intergranular corrosion U-shaped sample preparation device according to claim 1, wherein the elastic connection member is a spring provided at both end faces of the die assembly in the width direction, and the springs of each side are arranged in the length direction of the die assembly and are symmetrically provided with respect to the U-shaped groove.
7. The apparatus of claim 6, wherein one end of the spring is connected to the upper side of the first mold body or the second mold body and is close to the U-shaped groove, and the other end is connected to the lower side of the mold base and is far from the U-shaped groove.
8. The intergranular corrosion U-shaped sample preparation device of claim 1, wherein the power system is a hydraulic system comprising: the hydraulic transmission device is connected with the pressure head; And the control device is connected with the hydraulic transmission device to control the pressure and the movement stroke of the pressure head.
9. The intergranular corrosion U-shaped sample preparation device of claim 8, wherein the hydraulic system further comprises: A first table on which the mold assembly is disposed; the second workbench is arranged above the first workbench, and the hydraulic transmission equipment and the control equipment are arranged on the second workbench; The first workbench is connected with the second workbench through a stand column, and the pressure head is connected with the hydraulic transmission equipment and moves between the die assembly and the second workbench.
10. The preparation method of the inter-crystal corrosion U-shaped sample is characterized by comprising the following steps of: placing a sample on the mold assembly; Starting a power system, controlling a pressure head to move downwards, and utilizing an arc-shaped end head of the pressure head to press down a sample into a U-shaped groove of a die assembly; Under the pressure of the pressure head, one side, close to the top of the U-shaped groove, of the first die main body and the second die main body moves oppositely, so that the sample is bent to form an inner buckling angle; in the pressing process, the pressure and the movement stroke of the pressure head are controlled in real time through the power system, so that the inner buckling angle of the sample reaches a preset value; The ram is withdrawn allowing the specimen to rebound, eventually forming a two-arm parallel U-shaped specimen.

Description

Inter-crystal corrosion U-shaped sample preparation device and method Technical Field The invention belongs to the technical field of detection of intergranular corrosion of metal materials, and particularly relates to a device and a method for preparing an intergranular corrosion U-shaped sample. Background Intergranular corrosion (Intergranular Corrosion, IGC for short) refers to a corrosion phenomenon that occurs at the grain boundaries of metallic materials, and this type of corrosion generally has a serious impact on the overall structure and strength of the material. The intergranular corrosion test aims at evaluating the corrosion resistance of a material under specific environments, particularly the intergranular corrosion resistance after welding or heat treatment, determining whether the material is easy to generate intergranular corrosion in specific corrosion media, and optimizing the material selection and treatment process by testing the effects of different materials or treatment methods. The most common evaluation mode of the inter-crystal corrosion experiment in the laboratory at present is a physical test method, which is mainly to evaluate the inter-crystal corrosion condition by utilizing the change of physical properties, a metallographic method and a bending method are commonly used, the sample preparation process of the metallographic method is complex and needs special technology and equipment support, the time consumption is long, the method is suitable for single sample judgment, the bending method is to bend the sample to observe whether cracks appear at the bent position, so that the inter-crystal corrosion tendency of the material is evaluated. However, in the process of bending the sample into a U-shaped sample, it is difficult to ensure that the U-shaped size meets the standard or the specific requirements of sample evaluation, on one hand, a common manual tool is relatively crude and has lower precision, and on the other hand, after the sample is bent by using a fixed sample groove tool, the sample can rebound into a V-shaped sample due to certain toughness of a metal material, and the specific requirements of the standard and the sample evaluation cannot be met. Disclosure of Invention In view of the above drawbacks of the prior art, an object of the present invention is to provide an apparatus for preparing an intergranular corrosion U-shaped sample, which can obtain an intergranular corrosion U-shaped sample meeting the relevant test standard or specific requirements for sample evaluation by intelligent one-press molding, and can provide more accurate evaluation in the intergranular corrosion test. To achieve the above and other related objects, the present invention provides an intergranular corrosion U-shaped sample preparation apparatus, comprising: The pressure head is provided with an arc-shaped end head at one end; the power system is connected with the pressure head and controls the movement of the pressure head; The mould subassembly, set up in the pressure head below, the mould subassembly includes: a die base on which a first groove is provided; the first die body and the second die body are arranged in the first groove and are respectively connected with the die base through elastic connecting pieces; The first die body and the second die body are matched to form a U-shaped groove and a second groove, and the second groove extends from the bottom surface of the U-shaped groove to the bottom surface of the first groove; Under the pressure of the pressure head, one side, close to the top of the U-shaped groove, of the first die main body and one side, close to the bottom of the second groove, of the second die main body move oppositely. According to an embodiment of the present invention, the bottom surface of the first groove is arc-shaped, and a gap is left between the bottoms of the first mold body and the second mold body and the first groove. According to an embodiment of the present invention, a major arc groove is formed at a junction between a bottom surface of the first groove and two side surfaces of the first groove, and bottoms of the first mold main body and the second mold main body are respectively provided with a protrusion structure with a corresponding shape, and the protrusion structure is embedded into the major arc groove to connect the mold base with the first mold main body and the second mold main body; Under the pressure of the pressure head, the first die main body and the second die main body rotate by taking the protruding structures on the first die main body and the second die main body as centers respectively, so that one side, close to the top of the U-shaped groove, of the first die main body and one side, close to the bottom of the second groove, of the second die main body move in opposite directions. According to an embodiment of the present invention, the top surface of the mold main body is further provided with a positioning